Bronze-level articleList of medicinal plants

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Against allopathy

Alternative medicine

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Alternative articles

This list of medicinal plants aims to analyze medical claims made for herbs and list potential adverse effects they are known to have.[note 1]

The list will always be incomplete, given the vast number of herbs.

Herbal products such as St. John's wort are classified as dietary supplements by the U.S. Food and Drug Administration (FDA). The FDA's requirements for testing and obtaining approval to sell dietary supplements are different from its requirements for drugs. Unlike drugs, herbal products can be sold without requiring studies on dosage, safety, or effectiveness.

The quality of herbal products is often unpredictable. Products can differ in content not only from brand to brand, but from batch to batch. Information on labels may be misleading or inaccurate.

In addition, "natural" does not necessarily mean "safe." Many natural substances can have harmful effects–especially if they are taken in large quantities or if they interact with other supplements or with prescription medicines.
National Center for Complementary and Alternative Medicine

Herbal remedies vary greatly in efficacy, strength and price. As with anything else, moderation is also key.

The plants are listed alphabetically.


Contents

[edit] Individual herbs

[edit] A

  • Aconite[wp] (Aconitum spp.)
  • Also called: aconitum, monkshood, wolfsbane, leopard's bane, mousebane, women's bane, devil's helmet, Queen of all Poisons, blue rocket
  • Used in: Traditional Chinese medicine for rheumatism, bruises, arthritis, acute hypothermia, diarrhea, impotence, and yang imbalance.[1] There isn't enough evidence to know if it's good for anything.[2]
  • Harmful effects:
  • Aconite is very poisonous, and ingestion may lead to nausea, vomiting, weakness, sweating, breathing problems, heart problems, and death.[3]
  • Topical use can also cause severe side effects.[3]


  • Aloe[wp] (Aloe vera)
  • Also called: Aloë, true aloe
  • Beneficial effects: It is effective for topical application to treat minor burns and some skin problems, but may possibly be too dangerous to use internally as a laxative for constipation.[4] Aloe was formerly promoted by some CAM practitioners as a cancer treatment, but it is ineffective, and some patients died after receiving aloe injections.[4]
  • Harmful effects: A cancer study of aloe vera extract in rats and mice found that it "caused cancers of the large intestine in male and female rats and also caused hyperplasia of the large intestine, small intestine, stomach, and lymph nodes in male and female rats. Aloe vera extract also caused hyperplasia of the large intestine in male and female mice and hyperplasia of the mesenteric lymph node in male mice and hyperplasia of the stomach in female mice."[5]


  • American skullcap[wp] (Scutellaria lateriflora)
  • Also called: blue skullcap, mad dog skullcap
  • Claimed to: Be good for tension, anxiety, insomnia, neurasthenia, panic, headaches, fatigue, depression, melancholy, convulsions, jerking muscles, epilepsy, wobbliness, heart trembles, depression, arthritis, fever, snake bites, and rabies, and for PMS when used with chaste tree or false unicorn root.[6]
  • Research: Not much research has been done on the herb, so these claims can't be evaluated.[7]
  • Harmful effects: High doses can cause giddiness, stupor, mental confusion, twitching, irregular heartbeat, and seizures.[7] American skullcap has, on occasion, been contaminated with germander, which can cause liver damage.[7] American skullcap has been implicated in some cases of liver damage.[8]


  • Claimed to: Help skin problems; is not effective.[9]
  • Harmful effects:
  • Topical arnica is generally safe, but "repeated use can cause skin reactions, severe inflammation, itching, blisters, skin ulcers, and other allergy-related skin problems," especially when used on broken skin.[9]
  • Arnica is extremely toxic when ingested and shouldn't be taken internally.[9]


  • Asian ginseng[wp] (Panax ginseng)
  • Claimed to: be a wonder plant and cure everything.
  • Beneficial effects: Ginseng is effective for improving thinking skills, erectile dysfunction, and chronic obstructive pulmonary disease symptoms.[10] A specific cream containing ginseng can help with premature ejaculation.[10]
  • Harmful effects:
  • Side effects may include insomnia, or, more rarely, menstrual problems, breast pain, increased heart rate, high or low blood pressure, headache, loss of appetite, diarrhea, itching, rash, dizziness, mood changes, vaginal bleeding, Stevens-Johnson syndrome (a severe rash), liver damage, severe allergic reactions[10], mania and psychosis[11].
  • Panax ginseng contains a substance that has been found to cause birth defects in animals.[10]

[edit] B

  • Basil[wp] (Ocimum basilicum):
  • Used in: vaginal steaming
  • Claimed to: be antibacterial, spiritually cleansing
  • Beneficial effects: In vitro, has been shown to be antioxidant, antiviral, and antimicrobial.[12][13][14][15] No clinical studies, yet, however.
  • Harmful effects: Lowers blood pressure and prevents clotting, which situationally might be good but is often bad. Little efficacy otherwise.[16]
  • Bilberry[wp] (Vaccinium[wp] spp.)
  • Also called: blaeberry, whortleberry, hurts, ground hurts, whinberry, winberry, windberry, wimberry, myrtle blueberry and fraughan
  • Claimed to: be good for eye problems and night vision. Not effective for either.[17]
  • Government ratings: Prescribed for diarrhea and inflammation in Germany.
  • Harmful effects: Small doses are safe. Some negative interaction with prescribed anticoagulants.[18]


  • It contains aristolochic acid,[wp] (AA) which is a known carcinogen, and causes kidney failure and upper urinary tract cancer.[20] ::*Birthwort is considered to be a significant cause of kidney failure and upper urinary tract cancer in Taiwan,[20] because of the popularity of herbal medicine there (approximately 33% of Taiwan's herbal medicine prescriptions contain aristolochic acid,[20] and AA has been ingested by approximately 33% of Taiwan's population.)[21]
  • In Belgium, a weight loss spa using TCM herbs gave its clients herbal supplements containing birthwort, and as a result, more than 100 out of 1800 of its patients developed kidney failure, and several also developed urothelial and bladder cancers.[22]
  • European birthwort (Aristolochia clematitis) was also used as a medicinal plant and contains aristolochic acid. It has been linked to thousands of cases of kidney failure (Balkan endemic nephropathy[wp]) in Bosnia and Herzegovina, Bulgaria, Croatia, Romania and Serbia.
  • The true number of cases of aristolochic acid nephropathy (usually fatal) is unknown and is probably underestimated.[23]


  • Bitter orange[wp] (Citrus × aurantium)
  • Also called: Seville orange, sour orange, bigarade orange, marmalade orange
  • Beneficial effects: May be effective as a topical treatment for fungus infections.[24]
  • Harmful effects: Internal use may increase risk of high blood pressure, fainting, heart attack, stroke, and other severe side effects, especially if taken with caffeine.[24]


  • Black walnut[wp] (Juglans nigra)
  • Also called: eastern black walnut
  • Claimed to: be good for killing parasites (such as worms), and treating acne, thyroid disease, colitis, eczema, hemorrhoids, ringworm, sore throats, tonsillitis, skin irritations, wounds, and curing cancer.[25]
  • Effects: Unfortunately, there is insufficient research to determine what side effects it has or whether it is effective for anything.[26]


  • Betelnut[wp] (Areca catechu[wp])
  • Also called: areca nut, paan
  • Consumption: Areca nuts, usually wrapped with Piper betel[wp] leaves and/or slaked lime[wp] (calcium hydroxide) and/or tobacco, are ingested
  • Used in: traditional Chinese medicine for deworming[27] and in Southeast Asia to colour blacken teeth. It's also apparently "widely used in Ayurveda".[28]
  • Harmful effects:
  • Prolonged use can lead to mouth, liver, cervical, stomach, prostate, lung, and sweat gland cancer.[29][30][31][32]
  • Other side effects of betel nut/leaf include skin color changes, dilated pupils, blurred vision, wheezing/difficulty breathing, increased breathing rate, salivation, increased tearing, incontinence, sweating, diarrhea, fever, confusion, problems with eye movement, psychosis, amnesia, stimulant effects, and a feeling of euphoria.[29] It can also cause dependence, and withdrawal can cause anxiety or memory lapse.[29] Betel nut chewing can cause nausea, vomiting, diarrhea, stomach cramps, chest pain, irregular heartbeats, high or low blood pressure, and irregular heart beats.[29]
  • Usage may be associated with other diseases (HIV/AIDS, dengue fever, tuberculosis, and typhoid) due to immunosuppression, injury to the oral mucosa, and associated fecal-oral contamination of the betel quid ingredients.[33]


  • Black cohosh[wp] (Actaea racemosa)
  • Also called:' black bugbane, black snakeroot, fairy candle
  • Harmful effects: may include stomach upset, cramping, headache, rash, a feeling of heaviness, vaginal spotting or bleeding, and weight gain.[34]

[edit] C

  • Cat's claw (Uncaria tomentosa or Uncaria guianensis)
  • A claimed cure-all for HIV, cancer, you name it, and as usual it's a load of hogwash. It may have an unwanted effect on blood pressure.


  • Greater Celandine (Chelidonium majus)
  • Used internally for sedation, gallstone prevention, intestinal and digestive problems, liver disease, and eye irritation,[35] and topically for ringworm, warts, and corns.[36] Also, "liver diseases; has been used for inflammation of the gallbladder, inflammation of the bilary duct, loss of appetite, jaundice, hepatitis, dropsy, gout, arthritis, rheumatism, fevers, spasmodic coughs, bronchitis, asthma, intestinal polyps, breast lumps, angina, cramps, arteriosclerosis, gout, water retention, skin eruptions, scurvy, ulcers, cancers (specifically skin and stomach). [...] The tincture has been used for liver problems, facial, head, and shoulder neuralgia, constipation."[37]
  • There is no evidence to support any of the above claims.[35][36] However, a specific herbal mixture, which contains celandine along with several other herbs, may be effective for dyspepsia.[36]
  • May cause hepatitis.[35][36] (And it's claimed to be good for liver problems...)


  • Lesser Celandine (Ranunculus ficaria)
  • A buttercup-like plant unrelated to the Greater Celandine, one of the poppy family; traditionally used to treat piles; rare cases of hepatitis after use.[38]


  • Chamomile[wp] (Asteraceae[wp] spp.)
  • Used in: Vaginal steaming
  • There are many species called chamomile, each with some level of distinct chemical properties. Despite this, chamomile is routinely treated as a single herb and proscribed as such.[39][40] The two most common species are:


  • Chaparral (Larrea divaricata coville)
  • Used for lots of things, including cancer.[41] Chaparral is not effective for cancer and not known to be effective for anything else, either.[42] One CAM site claims it's good for lots of unrelated illnesses and only has "temporary unpleasant side effects",[41] but it's actually very dangerous.
  • Can cause fatal liver damage and kidney failure.[42] Other side effects may include fatigue, stomach pain, diarrhea, weight loss, fever, itching, rash, and allergic reactions.[42] Despite the title of that old cowboy serial, Chaparral cannot get you high.


  • Chrysanthemum[wp] (Asteraceae spp.)
  • Insufficient research to evaluate efficacy.[43] Chrysanthemum can cause the skin to be more sensitive to the sun.[43]


  • Cinnamon (Cinnamomum spp.)
  • Most of the spice sold in the U.S. as culinary cinnamon is from the species Cinnamonium cassia, a.k.a. Chinese cinnamon.
  • Claims: Lowers LDL cholestrol, maintains blood sugar, promotes appetite for elderly and sick, antioxidant, anti-microbial, anti-bacterial, stops tumor growth, anti inflammatory, arthritis, hair loss and bladder infections, colds, upset stomach, and even pimples.[44]
  • Truth: Apparently, it really does stop tumor growth - when it is injected into tumors in mice. Clearly, it's not really a home remedy.[45] The indications are quite good that it has an effect on blood sugar, however the details remain unknown.[46] None of the other claims seem to hold up, however.


  • Cloves (Syzygium aromaticum)
  • Used as an anesthetic in dentistry. Generally safe.
  • However, large amounts of cloves or clove oil may cause nausea, vomiting, abdominal pain, diarrhea, burns in the mouth and throat, sore throat, seizures, difficulty breathing, rapid heartbeat, sleepiness, intestinal bleeding, and liver or kidney failure.[47] More serious side effects may occur in children, even when small amounts are used.[47] "Excessive application of undiluted clove oil on or near the teeth may cause irritation or damage to the gums or mouth and may damage the dental pulp, the soft core of the tooth, made up of living soft tissue and cells. [...] Undiluted clove oil may cause skin irritation, rashes, or even burns. Clove oil can cause blindness in laboratory animals, so keep clove preparations away from the eyes."[47]


  • Coca leaves (Erythroxylon coca)
  • Used for nasal congestion in powdered form pain relief and altitude sickness in the Andes. Coca regulates carbohydrate metabolism and normalizes body functions. Otherwise known as cocaine when refined, though the unrefined leaf isn't addictive[48]. Side effects include turning into a yuppie, or a celebrity.
  • Endorsed by Pope Leo XIII (coca-infused Vin Mariani)[49], also enjoyed by Pope Pius X (Vin Mariani) and Pope John Paul II (coca tea)[50]
  • Not to be confused with cocoa or coconuts.


  • Coltsfoot (Tussilago farfara)
  • Not enough research has been done to evaluate efficacy.[51] Used as an expectorant and for coughs. Coltsfoot cigarettes are used for asthma.[52]
  • Can cause liver damage and cancer.[53] Coltsfoot supplements that are labeled "PA-free" (meaning without pyrrolizidine alkaloids) are better, but their safety is unknown.


  • Comfrey (Symphytum officinale)
  • Used internally for stomach problems and topically for wounds, though its effectiveness for these uses has not been studied.[54]
  • Can cause liver damage leading to death.[55] Comfrey contains compounds called pyrrolizidine alkaloids, which have been shown by animal studies to cause liver tumours, so the plant may also cause cancer in humans.[54] Even topical use may lead to a dangerous build-up in the body of some of the herb's poisonous substances, so long-term use is not advised.[55] Oral comfrey products are banned in the U.K., Australia, Canada, and Germany.[55]


  • Country mallow (Sida cordifolia)
  • Not enough research to evaluate efficacy.[56] Used in Ayurvedic medicine.[57]
  • Country mallow contains ephedrine, which is also found in ephedra, and may cause ephedrine-related side effects like high blood pressure, heart attacks, muscle disorders, seizures, strokes, irregular heartbeat, loss of consciousness, and death.[58][56] Other side effects may include dizziness, restlessness, irritability, insomnia, headache, lack of appetite, nausea, vomiting, flushing, tingling, difficulty urinating, kidney stones, and pounding heartbeat.[56] May make anxiety, thyroid problems, and angina worse.

[edit] D

  • Dandelion (Taraxacum spp)
  • Known to be an effective diuretic,[59] claimed to help with digestive and liver problems, but there has been no serious research of these claimed effects. The entire plant is edible.
  • The plant has no harmful side effects aside from its diuretic properties, which may interfere with certain medications, and or cause increased frequency of changing pajamas and bedsheets.
  • Effective for osteoarthritis pain.[60] Insufficient study has been done to evaluate its effectiveness for anything else.[60]
  • Side effects may include diarrhea, nausea, vomiting, abdominal pain, headaches, ringing in the ears, loss of appetite, and loss of taste.[60] Other side effects may include allergic skin reactions, menstrual problems, and changes in blood pressure.[60] Use of devil's claw during pregnancy is not advised, as it may harm the fetus.[60]
  • Dong quai (Angelica sinensis)
  • Used in traditional Chinese medicine.
  • It may be dangerous to take dong quai in large amounts for a long time because it contains carcinogens.[61] Dong quai can cause skin to be more sensitive to sunlight, thus possibly increasing the risk of skin cancer.[61] It may or may not act like estrogen in the body.[61] It can slow blood clotting and increase the risk of bleeding, and so should not be taken less than 2 weeks before surgery.[62] Dong quai may increase the risk of miscarriage.[62]

[edit] E

  • Echinacea (Echinacea spp.)
  • Claimed to be effective for supporting the immune system and preventing and treating colds and flus. It isn't.[63]
  • Side effects may include headache, dizziness, nausea, constipation, abdominal pain, and rash.[63]
  • Eleuthero (Eleutherococcus senticosus)
  • Like many other herbs, eleuthero is promoted for a wide variety of unrelated conditions. There is no evidence to support its effectiveness in treating anything.[64]
  • Side effects may include headache, diarrhea, nervousness, trouble sleeping, raised blood pressure and increased heart rate. However, it may also lower blood sugar levels. "Eleuthero may alter the amount of time it takes for bleeding to stop."[64]
  • Ephedra (Ephedra sinica, also known as ma huang)
  • Used in traditional Chinese medicine for promoting sweating and the treatment of upper respiratory tract infections during winter. Studies done on the active chemicals of Ephedra/ma juang demonstrates that it speeds the metabolism, thus, the reason for its use and abuse as a performance-enhancing drug by athletes and for weight loss.[65]
  • Side effects may include dizziness, restlessness, anxiety, irritability, heart pounding, headache, loss of appetite, nausea, vomiting, hypertension, insomnia, arrhythmia, nervousness, tremor, seizure, cerebrovascular event, myocardial infarction, kidney stones, high blood pressure, heart attacks, muscle disorders, seizures, strokes, irregular heartbeat, loss of consciousness, death, and others.[65][66]
  • Dietary supplements containing ephedra are banned in the U.S. because they pose "an unreasonable risk to health."[67]
  • European birthwort (Aristolochia clematitis) See Birthwort
  • Evening primrose oil (Oenothera spp.)
  • Useless for eczema,[68] but may help with breast pain.[69] Insufficient evidence for any other conditions.
  • Side effects may include upset stomach, nausea, diarrhea, and headache.[69]
  • Eyebright (Euphrasia spp.)
  • Used for eye problems.
  • Side effects may include confusion, headache, tearing, itching, redness, vision problems, sneezing, nausea, toothache, constipation, cough, trouble breathing, trouble sleeping (insomnia), sweating, and others.[70]

[edit] F

  • Female ginseng: See Dong quai
  • Feverfew[wp] (Tanacetum parthenium)
  • Effective mild painkiller. MedlinePlus Supplements notes that "Some feverfew tablet products can contain little or no feverfew."[71]
  • Side effects may include upset stomach, heartburn, diarrhea, constipation, bloating, flatulence, nausea, and vomiting. Other reported side effects include nervousness, dizziness, headache, trouble sleeping, joint stiffness, tiredness, menstrual changes, rash, pounding heart, and weight gain.[71] Chewing raw feverfew may lead to mouth ulcers, loss of taste, and swelling of the lips, tongue, and mouth.[72]
  • Fennel (Foeniculum vulgare)
  • Not enough research done to evaluate claims.[73]
  • Foxgloves (Digitalis spp.)
  • Used for heart problems. Is effective, but:
  • Whether or not a given quantity of digitalis contains enough digoxin to lead to an overdose depends on the individual plant(s) it's from (each individual plant (even in the same species) has a different digoxin content) so those using digitalis are effectively playing Russian roulette. There is no way of knowing if one pill is good, or if it will lead to an overdose and kill you. As Encyclopedia.com puts it:
    Foxglove is no longer used as a heart medicine because the therapeutic dose and the lethal dose are very close. Seasonal variations in the level of cardiac glycosides in the plant make the safe dose impossible to estimate except by an experienced physician and prescriber of the herb who monitors the patient on an hourly basis for signs of overdose. Few living doctors and herbalists can safely use digitalis as a plant extract. Specific standardized doses of pharmaceutical digoxin are used instead.[74]
  • The solution is to use pure digoxin, if prescribed by a doctor, because the doses are exactly measured.
  • Side effects may include irregular heart function and death.[75] Symptoms of digitalis overdose may include "stomach upset, small eye pupils, blurred vision, strong slow pulse, nausea, vomiting, dizziness, excessive urination, fatigue, muscle weakness and tremors, stupor, confusion, convulsions, abnormal heartbeats, and death. Long-term use of digitalis can lead to symptoms of toxicity, including visual halos, yellow-green vision, and stomach upset."[75]

[edit] G

  • Garlic[wp] (Allium sativum)
  • Claimed to: Fights minor viral infections such as cold and sore throat, lowers blood sugar, blood cholesterol and blood pressure, reduces risk of certain cancers.
  • Truth:
    • Known antimicrobial effect in vitro, tests suggest some effect on throat infections in greater-than-typical amounts.
    • Cancer claims based on large-scale statistics of incidence and diet, probably bullshit.[76]
    • A meta-analysis showed consistent evidence that garlic powder intake reduces the cardiovascular disease risk factors of total cholesterol, LDL cholesterol and blood pressure.[77]
    • Garlic consumption increases cellular hydrogen sulfide (H2S) production.[78] Increased production of cellular (H2S) is likely behind the life-extension effects of caloric restriction in animals.[79][80]
    • Seductive effect on body odor well-documented and conclusive. Freshens breath for up to twelve hours.
  • Side effects:
  • Bad breath, a burning sensation in the mouth or stomach, heartburn, gas, nausea, vomiting, body odor, diarrhea, and an increased risk of bleeding.[81]
  • "Asthma has been reported in people working with garlic, and other allergic reactions are possible."[81]


  • German chamomile[wp] (Matricaria chamomilla)
  • Also called: Hungarian chamomile, wild chamomile, or scented mayweed. Is a subset of chamomile.
  • Used in: Vaginal steaming
  • Claimed to: calm frayed nerves, treat stomach problems, relieve muscle spasms, treat skin conditions, treat mild infections, treat chest colds, treat sore throats, treat abscesses, treat gingivitis, treat anxiety, treat insomnia, teat psoriasis, treat acne and eczema, treat first-degree burns, treat ulcerative colitis, treat stomach ulcers, treat chickenpox, treat diaper rash, and treat colic.[40]
  • Beneficial effects:
  • Animal studies have shown that German chamomile reduces inflammation, speeds wound healing, reduces muscle spasms, and serves as a mild sedative to help with sleep. Test tube studies have shown that chamomile can kill bacteria, fungus, and viruses. Very few studies exist to see if the same is true in people.[40]
  • One (out of one) controlled study suggests that chamomile may help reduce the effects of anxiety disorder.[40]
  • Two studies suggest German chamomile may reduce eczema.[40]
  • Non-reliable effects:
  • No large and reliable studies have shown chamomile to help with indigestion.[40]
  • Studies report mixed results for German chamomile as prevention against mouth sores resulting from radiation or chemotherapy.[40]
  • Harmful effects:
  • Considered "generally safe".[40]
  • May be allergenic to those allergic to asters, daisies, chrysanthemums, or ragweed.[40]
  • May cause miscarriage when pregnant. Do not take while pregnant or breastfeeding.[40]
  • May worsen asthma.[40]
  • Moderate sedative.[40]
  • Thins the blood.[40]
  • May lower blood sugar.[40]
  • If too much is drunk, may cause vomiting.[40]
  • May be dangerous to women with estrogen-sensitive conditions, such as cancer.[40]
  • Interacts with the liver, potentially causing changes in other drugs.[40]


  • Germander (Teucrium spp.)
  • Claimed to: be effective for gout, fever, diarrhea, gallbladder problems, and claimed to be useful for weight loss and as an antiseptic.[82] There is currently insufficient evidence to evaluate these claims.[82]
  • May cause: hepatitis, cirrhosis, and death.[83] A weight loss supplement sold in France that contained germander caused several cases of hepatitis, and because of this, the herb is banned in that country and others.


  • Ginkgo (Ginkgo biloba)
  • Ginkgo is sold as a "memory aid" and a treatment for Alzheimer's disease. Studies show mixed results on efficacy, with a possibility of it being better than placebo.
  • A cancer study of Ginkgo extract found that it "caused cancers of the thyroid gland in male and female rats and male mice and cancers of the liver in male and female mice."[84]


  • Ginseng[wp] (Panax spp.)


  • Claimed to: be a good disinfectant. This effect is due not to the grapefruit seed extract itself, which is not antimicrobial, but to contaminants/additives such as benzethonium chloride and triclosan, which are frequently found in grapefruit seed extract products.[85][86][87]


  • Grape seed extract (Vitis vinifera)
  • Good for chronic venous insufficiency and edema.[88]
  • Side effects may include headache, itchy scalp, dizziness, and nausea.[89]


  • Graviola


  • Used for weight loss.
  • Side effects may include stomach upset and constipation, and, in rare cases, liver damage.[90] Caffeine-related side effects may include headache, nervousness, sleep problems, vomiting, diarrhea, irritability, irregular heartbeat, tremor, heartburn, dizziness, ringing in the ears, convulsions, confusion, and reduced absorption of iron from food.[90] Also implicated in outbreaks of Britishness. Jolly splendid, indeed!


  • Groundsel (Senecio vulgaris)
  • Claimed to: be an "Anthelmintic; Antiscorbutic; Diaphoretic; Diuretic; Emmenagogue; [...] Poultice; Purgative", and claimed to be good for stomach problems and worms.[91][92] There is not enough evidence to evaluate these claims.[92]
  • Groundsel is very toxic, and can cause liver damage, cancer, and birth defects.[92] It should not be used.
  • Goldenseal[wp] (Hydrastis canadensis)
  • Used for "immune system boosting". The evidence doesn't suggest Goldenseal is effective for any condition.[93]
  • Small doses may be fine, except during pregnancy or breastfeeding, since goldenseal might cause brain damage to the baby.[94] "High doses may cause breathing problems, paralysis, and even death. Long-term use may lead to vitamin B deficiency, hallucinations, and delirium."[95] It may also affect blood pressure unpredictably because it contains several different compounds that have opposite effects on blood pressure.[95] It can also make you more sensitive to light.[95] A cancer study of goldenseal root powder in mice and rats showed that it "caused cancer in the liver of male and female rats and male mice. There was no effect of goldenseal root powder on female mice."[96]

[edit] H

  • Henbane (Hyoscyamus niger)
  • Used for pain, Parkinson's disease symptoms, and ulcers.[97] It is also smoked to "cure" asthma and bronchitis[97] (sounds familiar). There is no evidence to support its use for any of these conditions.[98]
  • Henbane is toxic, and when used for self-treatment may result in fatal poisoning.
  • Side effects may include dry mouth, red skin, constipation, overheating, reduced sweating, vision disturbances, increased heart rate, urination problems, drowsiness, restlessness, hallucinations, delirium, manic episodes, and death. Mostly death.
  • For a while, henbane berries were used in the manufacture of an herbal beer flavoring called "gruit," which was flavored with various sweet and bitter herbs, before people began using hops. Fell out of favor during the Middle Ages when the Reinheitsgebot declared that all beers in the Holy Roman Empire could only be made with barely, hops, water, and yeast.[99]
  • Horny goat weed (Epimedium spp.)
  • Used for erectile dysfunction.[100]
  • Can prevent bone loss in postmenopausal women.[101]
  • Has totally awesome name.
  • Evidence of side effects is largely anecdotal, and range from irregular heartbeat to mood changes.[102]
  • Horse chestnut (Aesculus hippocastanum)
  • Standardized horse chestnut seed extract is good for varicose veins, chronic venous insufficiency, and symptoms of poor blood circulation.[103]
  • Standardized, esculin-free horse chestnut seed extract is mostly safe, with side effects including dizziness, headache, stomach upset, and itching.[103] It may lower blood sugar.[103][104] Raw horse chestnut seed, leaf, bark, and flower, on the other hand, are toxic and can be lethal.[103]
  • Horsetail (Equisetum sp.)
  • Used in: vaginal steaming
  • Insufficient research done on efficacy.[105]
  • Side effects of long-term use may include low potassium levels and (in diabetics) low blood sugar.[105]
  • Horsetail contains Thiaminase, an enzyme which (if consumed), can cause thiamine[wp] (or vitamin B1) deficiency (called beriberi[wp]),[105][106] Thiaminase can be removed if horsetail is prepared properly, usually involving cooking.
  • Symptoms of beriberi may include difficulty walking, loss of feeling (sensation) in hands and feet, loss of muscle function or paralysis of the lower legs, mental confusion/speech difficulties, pain, strange eye movements (nystagmus), tingling, vomiting, awakening at night short of breath, increased heart rate, shortness of breath with activity, and swelling of the lower legs.[107] Beriberi, if caught early enough, can usually be reversed, but possible complications of beriberi may include coma, congestive heart failure, psychosis, and death.[107] Because of the possibility of thiamine deficiency, people consuming horsetail should take thiamine supplements.
  • Horsetail contains chromium and may increase the risk of chromium poisoning if taken with chromium-containing herbs like bilberry, brewer's yeast, or cascara.[106]

[edit] I

  • Impila (Callilepsis laureola)
  • A traditional Zulu remedy used for tapeworm, snakebites, infertility, whooping cough, and to kill maggots in cattle. It is also used as a disinfectant.[108]
  • It can cause fatal kidney and/or liver failure.[109]

[edit] J

  • Jimson weed (Datura stramonium)
  • Insufficient evidence to evaluate efficacy.[110] Jimson weed leaves are smoked for asthma.[111]
  • Jimson weed is poisonous and can cause dry mouth and extreme thirst, vision problems, nausea and vomiting, fast heart rate, hallucinations, high temperature, seizures, confusion, loss of consciousness, breathing problems, and death.[110] "The deadly dose for adults is 15-100 grams of leaf or 15-25 grams of the seeds."[110]

[edit] K

  • Kava (Piper methysticum)
  • Effective for anxiety.[112]
  • Side effects may include liver damage leading to death, even with short-term use (1-3 months) of normal doses,[112] and sedation, oral and lingual dyskinesia, torticollis, oculogyric crisis, exacerbation of Parkinson's disease, painful twisting movements of the trunk, and rash.[66] A cancer study of kava extract in mice and rats found that it caused liver in male and female mice and "increased incidences of lesions in the liver, forestomach, kidney, eye, and pancreas of male and female rats, in the liver of male and female mice, and in the forestomach of female mice."[113]

[edit] L

  • Leopard's bane[wp]


  • Licorice (Glycyrrhiza glabra)

The University of Maryland Medical Center lists a large number of possible medicinal uses of the licorice plant, saying licorice "has been used in both Eastern and Western medicine to treat a variety of illnesses...It acts as a demulcent, a soothing, coating agent, and as an expectorant, meaning it helps get rid of phlegm."

It has side effects in large quantities: Bad for heart disease, kidney disease, pregnant women, male sexual function, among others, and there are many other side effects. Taking a lot of licorice can cause brain damage even in healthy people.
Side effects may include include tiredness, absence of a menstrual period in women, headache, water and sodium retention, decreased sexual interest and function in men, miscarriages or early deliveries, and raised blood pressure. It can also make heart and kidney disease worse.[114]
  • According to MedlinePlus Supplements, "Consuming 30 grams or more of licorice daily for several weeks can cause severe side effects including high blood pressure, low potassium in the blood, weakness, paralysis, and occasionally brain damage in otherwise healthy people. In people who eat a lot of salt or have heart disease, kidney disease, or high blood pressure, as little as 5 grams per day can cause these problems."[114] Licorice "might act like estrogen in the body. If you have any condition [such as breast cancer, uterine cancer, ovarian cancer, endometriosis, or uterine fibroids] that might be made worse by exposure to estrogen, don’t use licorice."[114] Licorice can interact with grapefruit juice, possibly increasing its ability to deplete human potassium levels, and licorice's side effects of sodium and water retention and increase in blood pressure can worsen if taken with salt.[114]
  • Licorice can interact with heart medicines, steroids, diuretics, or insulin.[115]


  • Lily-of-the-valley (Convallaria majalis)
  • Used for epileptic seizures, strokes, angina, conjunctivitis, leprosy, and heart problems.[116] Not enough study has been done to evaluate any of the claims.[117]
  • The plant is poisonous and can be fatal. Doses must be very specific and prescribed by a professional (although what with the lack of evidence, what's the point?) Self-medication or wrong doses may result in blurred vision, excessive urination at night, halos around objects, diarrhea, Loss of appetite, Stomach pain, Vomiting or nausea, irregular or slow heartbeat confusion, depression, disorientation, drowsiness, fainting, headache, lethargy, weakness, rash, and hives.[118]


  • Lobelia (Lobelia inflata)
  • Used for asthma, bronchitis, cough, and smoking cessation.[119] Not enough study has been done to verify lobelia's effectiveness for any of these.
  • Side effects may include profuse sweating, nausea, vomiting, diarrhea, tremors, rapid heartbeat, mental confusion, convulsions, hypothermia, coma, and death.[119] It's not called Indian Tobacco for nothing.

[edit] M

  • Ma huang: See Ephedra.
  • Madder root (Rubia tinctorum)
  • Sometimes used in herbal medicine as an "astringent diuretic, emmenagogue", and claimed to be good for many conditions, including alkaline urine, diarrhea, inflammation, wounds, broken bones, fever, and many others.[120][121][122] There is no evidence to support the use of madder root for any of these conditions.[123] The root is used in Ayurveda and Hildegard medicine. Madder root is also used for dyeing fabrics.
  • May cause cancer, birth defects, and miscarriages.[123] It can also make urine, saliva, perspiration, tears, and breast milk turn red. One wonders if happier root would be any better. An extract of madder root, used as a food coloring in Japan, was found to cause liver cancer in rats.[124]
  • Effects may include mild euphoria, relaxed muscles, increased appetite and...wait, what? Did I say that out loud? Whoa... Have you ever looked at your hand? I mean REALLY looked at your hand? Side effects include paranoia and apathy. Marijuana and other cannabis products have little or no 'healing' purposes, but may relieve symptoms of other conditions or diseases. It is considered one of the safest substances of abuse, including legal drugs, such as alcohol and coffee.
  • Maté (Ilex paraguariensis)
  • Consumed as a beverage. It is extremely popular in South America.
  • Non-caffeine-related side effects include an increased risk of mouth, esophageal, laryngeal, kidney, bladder, and lung cancer.[125][126] The oral cancer associations may be due to the very high temperatures at which maté tea is traditionally drunk, but the associations with kidney, bladder, and lung cancer would not be temperature related.[126] Caffeine-related side effects include insomnia, nervousness and restlessness, stomach upset, nausea and vomiting, increased heart rate and breathing, high blood pressure, headache, ringing in the ears, irregular heartbeats, slowed blood clotting, and worsened diarrhea.[125]
  • Best remove it from your diet.
  • Milk thistle (Silybum marianum)
  • Used as a liver protectant, and sometimes for irritable bowel syndrome.
  • Side effects may include diarrhea, nausea, bloating, gas, and upset stomach.[127]
  • Mistletoe (Viscum album)
  • Claimed to be good for cancer prevention, hypertension, and insomnia.[128] Mistletoe isn't effective for cancer; insufficient research has been done to evaluate the other claims.[129]
  • When small amounts are taken, it is safe, with mild side effects of headaches, fever, and chills.[130] Large amounts are toxic and can be fatal; symptoms may include seizures, coma, death, blurred vision, nausea and vomiting, stomach pain, diarrhea, slow or irregular heartbeat, low blood pressure, confusion, and drowsiness.[130]
  • Mugwort (Artemisia vulgaris)
  • Mu Tong (Caulis aristolochiae)
  • Used in traditional Chinese medicine for "relieving excess fire" and "stimulating the secretion of milk".[132]
  • May cause fatal kidney failure because, like birthwort, it contains aristolochic acid.[133]

[edit] N

  • Neem (Azadirachta indica)
  • Not known to be effective for anything.[134]
  • Safe when taken short-term by adults.[134] Neem is contraindicated for children, because it can cause vomiting, diarrhea, drowsiness, blood disorders, seizures, loss of consciousness, coma, brain disorders, and death.[134] High-dose or long-term internal use by adults is dangerous, and can harm the kidneys and liver, lower blood sugar, and cause infertility and miscarriages.[134]

[edit] O

  • Oil of oregano[wp]
  • A herbal supplement often vaunted as an anti-fungal, anti-viral, anti-bacterial, abortifactant, anti-asthma, anti-malaria, antioxidant and anti-cold/flu/headache medication (take your pick). While it has a higher rate of success on malaria and bacteria on the skin than normal water, it has significantly less sucess than any standard over-the-counter antibiotic or medicinal anti-malaria drug.[135] As with most woo, there is always a glint of truth that gets warped into $$$$$.[136] It is a good antioxidant, but not more so than raw oregano, which tastes better and makes wicked salads. And, despite its name, it tastes absolutely foul (as this user will attest).
  • Side effects may include gastrointestinal issues and allergic reactions.[citation needed]
  • Oleander (Nerium oleander)
  • Insufficient research to evaluate efficacy.[137] Used for muscle cramps, asthma, cancer, and AIDS.[138][139]
  • Oleander leaf is poisonous, and can cause fatal heart failure. Symptoms may include nausea, vomiting, colic, appetite loss, dizziness, drowsiness, high potassium levels, dilated pupils, bloody diarrhea, seizures, loss of consciousness, slow or irregular pulse, and heart block.[139] Oleander seeds are also toxic, as is the rest of the plant, sap, twigs, roots, etc.[137]
  • Opium poppy (Papaver somniferum)
  • Latex exuded by immature seed pod used for analgesic purposes. Tinctures of seeds and straw used to a lesser extent. The latex at least is suggested by research to be effective, albeit prone to habituation and dependency.
  • Oregano[wp] (Origanum vulgare)
  • Studies show long-term use of oregano may reduce high cholesterol.[140]
  • Studies show long-term use of oregano may kill the stomach parasites Blastocystis hominis, Entamoeba hartmanni, and Endolimax nana.[140]
  • Non-benefits:
  • A study suggested that oregano did not prevent bleeding in people with hemophilia.[140]
  • A study suggested that oregano did not speed or aid the wound healing process, though it did reduce skin stiffness and improve skin color.[140]
  • Research: No other major research on oregano's health benefits has been conducted. Despite contrary claims, oregano has not been shown to help asthma, bronchitis, coughing, the flu, indigestion, painful menstrual periods, arthritis, headaches, or heart conditions.[140]
  • Side effects:
  • Oregano is probably safe in food quantities.[140]
  • Oregano is possibly unsafe in medicinal quantities during pregnancy, and may possibly cause miscarriage.[140]
  • Oregano may increase the risk of bleeding, which may be problematic before surgery and in people with bleeding disorders.[140]
  • Oregano can lower blood sugar levels, potentially problematic for diabetics.[140]
  • People can be allergic to oregano.[140]
  • Oregano is a diuretic.[wp][140]

[edit] P

  • Parsley (Petroselinum crispum)
  • Sometimes used for home abortions, but its effectiveness for this has not been scientifically studied.
  • The claims: Parsley is touted as a general anti-toxin,[141] control blood pressure, cure diabetes,[142] urinary tract infections, prevents cancer, stimulates contractions of the uterus, cures rheumatism, treats kidney and bladder stones,[143] and can even remove tooth aches.
  • The truth: Surprisingly, it is dangerous for women, as it can cause the uterus to contract prematurely and should not be inserted into or rubbed near the uterus. It is also helpful for treating cancer patients, as it contains high levels of apiginin, which prevent blood from reaching the tumor.[144] And it has mild anti microbial-use - on those days when you can't run to your medicine cabinet and grab a tube of far more effective antibiotic.
  • It is harmless when taken in the small amounts found in food, but the large amounts used in herbal medicine may cause anemia and liver or kidney problems, and make water retention, high blood pressure, and kidney disease worse.[145] Topically applied parsley oil can make skin become more sensitive to sunlight and cause a rash.[145]
  • Pennyroyal[wp] (Lamiaceae)
  • Used in various ways, such as for inducing miscarriages and deworming. There is no evidence to support the effectiveness of pennyroyal for anything besides abortions[146] (but see note below).
  • The essential oil is toxic and can be fatal if ingested.
  • Peppermint oil (Mentha piperita)
  • Used for gastrointestinal problems.
  • Side effects may include heartburn, and, more rarely, nausea, vomiting, headache, flushing, mouth irritation/sores, severe stomach/abdominal pain, and anal burning during bouts of diarrhea.[147][148]

[edit] R

  • Red clover[wp] (Trifolium pratense)
  • Available research does not show red clover treats cancer, coughing, hair loss, skin conditions, or any other medical conditions.[149][150][151]
  • Available research does not show red clover is an antibiotic.[149]
  • Available research has mixed results on whether red clover reduces osteoporosis, and leans towards no effect.[149][150][151]
  • Available research has mixed results on whether red clover reduces menopausal symptoms.[149][150]
  • Available research has mixed results on whether red clover reduces LDL ("bad" cholesterol) levels, and leans toward no effect.[149][150]
  • Researchers theorize that red clover may help to prevent cancers that estrogen helps to prevent, and help to cause cancers that estrogen helps to cause.[150]
  • Harmful effects:
  • Do not put onto wounds without a doctor's advice.[149]
  • Generally safe in food and drink.[149]
  • May increase risk of excessive bleeding.[149][150][151][152]
  • May cause headaches, nausea, and rashes.[150]
  • Women with estrogen-sensitive cancers (such as breast cancer, uterine cancer, ovarian cancer) or other estrogen-sensitive (such as endometriosis or uterine fibroids) should not take red clover.[149][151][153]
  • Pregnant or breastfeeding women should not take red clover.[149]


  • Roman chamomile[wp] (Chamaemelum nobile)
  • Also called: English chamomile, garden chamomile, ground apple, low chamomile, or whig plant. Is a subset of chamomile.
  • Used in: vaginal steaming
  • Claimed to: calm frayed nerves, treat stomach problems, relieve muscle spasms, treat skin conditions, treat infections, treat nausea, treat vomiting, treat heartburn, treat loss of appetite, treat intestinal gas, relieve anxiety, reduce inflammation from cuts or hemorrhoids, help with burns, be antibacterial, be antiviral, be antifungal, treat morning sickness, treat painful menstrual periods, treat sinusitis, treat liver and gallbladder disease, deal with gallstones, prevent heartburn, ease the discomfort of swollen gums, treat ear inflammation, treat sore throats, and "purify" the blood.[39][154]
  • Beneficial effects:
  • May reduce flatulence; insufficient research.[154]
  • Insufficient evidence for treatment of painful periods.[154]
  • Harmful effects:
  • Considered "generally safe".[39]
  • May be allergenic to those allergic to asters, daisies, chrysanthemums, or ragweed.[39]
  • May cause miscarriage when pregnant. Do not take while pregnant or breastfeeding.[39][154]
  • May worsen asthma.[39][154]
  • Moderate sedative.[39][154]
  • Thins the blood.[39]
  • May lower blood sugar.[39]
  • If too much is drunk, may cause vomiting.[39][154]
  • May be dangerous to women with estrogen-sensitive conditions, such as cancer.[39]
  • Interacts with the liver, potentially causing changes in other drugs.[39]


  • Rosemary[wp] (Rosmarinus officinalis)
  • Used in: vaginal steaming
  • Claimed to: solve digestion problems, heartburn, flatulence, liver and gallbladder problems, lack of appetite, gout, coughing, headaches, high blood pressure, and age-related memory loss. No such effects have been proven.[155][156]
  • Beneficial effects:
  • Lab work shows rosemary has antioxidant properties.[156]
  • Studies suggest long-term rosemary use may prevent thrombosis[wp] in humans.[156]
  • Studies suggest rosemary may neutralize several foodborne pathogens.[156]
  • One (one, badly designed, and small) study suggests rosemary, if used topically on the head, may help hair regrowth.[156]
  • Two studies (small, aromatherapy, not compared to placebo) suggest it may help reduce stress.[156]
  • Improved speed and accuracy on a test for a study of sample 20 people when scent was inhaled.[157]
  • Contains antioxidants[wp] Carnosic acid[wp] and Carnosol[wp].[158][159][160] No proven resulting benefits, however.
  • Is a little spicy and smells nice.[155][156]
  • Harmful effects:
  • Is probably safe if the leaf itself is eaten; is rated as Generally Recognized as Safe in the U.S.;[161] the German Commission E has approved it.[156]
  • May impact blood clotting.[156]
  • May impact ACE inhibitors, taken for high blood pressure.[156]
  • Is diuretic[wp].[156]
  • May impact blood sugar levels.[156]
  • Large quantities of rosemary leaves can cause vomiting, spasms, comas, and pulmonary edema[wp].[156]
  • Large quantities of rosemary leaves may increase menstrual blood flow and can cause miscarriage and is rated Possibly UnSafe in the U.S. Even while pregnant, however, it is safe to eat as a spice in food.[156][162]
  • "People with high blood pressure, ulcers, Crohn's disease, or ulcerative colitis should not take rosemary."[156]
  • Rosemary oil may be toxic if consumed orally.[156]

[edit] S

  • Sage[wp] (usually Salvia officinalis, also Salvia lavandulaefolia)
  • Also called: garden sage, common sage
  • Used in: vaginal steaming, aromatherapy
  • Claimed to: move blood and chi through physical and emotional obstructions, reduce loss of appetite, reduce flatulence, reduce stomach pain, reduce diarrhea, reduce stomach bloating, reduce heartburn, reduce overproduction of perspiration, reduce overproduction of saliva, reduce depression, reduce memory loss, reduce Alzheimer's disease, reduce painful menstrual periods, reduce excessive milk flow during nursing, and reduce hot flashes during menopause, (when applied topically) help cold sores, gum disease (gingivitis), sore mouth/throat/tongue, swollen nasal passages, and (when inhaled) reduce asthma.[163]
  • Beneficial effects:
  • May potentially improve learning, memory, and information processing for mild to moderate Alzheimer's disease.[163]
  • May improve memory and attention.[163]
  • Appears to remove cold sores slightly slower than medical products.[163]
  • May reduce "bad" cholesterol.[163]
  • May reduce symptoms of menopause, such as hot flashes.[163]
  • In one study, sage extract significantly reduced ultraviolet-induced erythema.[164]
  • Unproven effects:
  • Not known if sage reduces lung cancer.[163]
  • Not known if sage helps sore throats.[163]
  • Not known for other conditions.[163]
  • Harmful effects:
  • Salvia officinalis contains thujone. Thujone can be poisonous in sufficient doses, and can cause seizures, damage to the liver, and damage to the nervous systems. The amount of thujone varies with the species of plant, the time of harvest, growing conditions, and other factors.[163]
  • If pregnant or breastfeeding, the risk of thujone poisoning is especially high.[163]
  • For persons with higher risks of seizures, thujone is especially dangerous.[163]
  • Sage may reduce blood sugar, affecting patients with diabetes and patients undergoing surgery.[163]
  • Spanish sage (Salvia lavandulaefolia) may affect estrogen-receptive growths, such as breast cancer, uterine cancer, ovarian cancer, endometriosis, or uterine fibroids.[163]
  • Spanish sage (Salvia lavandulaefolia) might increase blood pressure in those with high blood pressure, while common sage (Salvia officinalis) might lower blood pressure in people with low blood pressure.[163]
  • Sage can cause drowsiness.[163]


  • Sassafras (Lauraceae spp.)
  • Claimed to be effective for joint pain and preventing colds and flus.[165] There is no evidence to support its use for these conditions.[166]
  • Sassafras is poisonous, and even 5ml can be fatal. Side effects may include cancer, liver damage and miscarriages. Also, sweating and hot flashes. "High amounts can cause vomiting, high blood pressure, hallucinations, and more severe side effects. It can cause skin rashes when used on the skin."[166]


  • Saw palmetto (Serenoa repens)
  • Extract of the fruit of a fan palm. Taken for BPH (benign prostatic hyperplasia) a.k.a. Getting up 5 times at night to piss. Some studies assert its effectiveness.


  • Senna (Cassia angustifolia)
  • Effective for constipation.[167]
  • Short-term use may cause stomach discomfort, cramps, and diarrhea.[167] Long-term use (over two weeks) can stop the bowels from functioning properly and cause dependence; it may also cause heart function disorders, muscle weakness, liver damage, and other side effects.[167]


  • Siberian ginseng (Eleutherococcus senticosus) See Eleuthero


  • Soursop (Annona muricata)
  • A tropical fruit touted as a "wonder cure" for cancer.[168] Despite some promising results, there are no definite conclusions in this area.[169] There are, however, definite indicators of a neurotoxic effect, with symptoms similar to Parkinsonism.[170]



  • Spinach (Spinacia oleracea)
  • May contribute to kidney stone formation by increasing the amount of oxalate in the urine.[171]


  • Squill (Urginea maritime)
  • Not enough research to evaluate efficacy for anything.[172] Used for heart problems, bronchitis, asthma, whooping cough, and wounds.
  • The herb is cardiotoxic and can be lethal, with side effects including stomach irritation, loss of appetite, diarrhea, vomiting, headache, vision changes, depression, confusion, hallucinations, irregular heartbeat, skin rash, miscarriages, seizures, life-threatening abnormal heart rhythms, and death.[172]


  • Stevia (Asteraceae spp.)
  • Used as a sweetener.
  • Usually no side effects, but rare ones may include bloating, nausea, dizziness, muscle pain, and numbness.[173]


  • Regarded by herbalists and some medical authorities as an effective treatment for depression; trials are mixed, partly due to depression's high susceptibility to the placebo effect.[174][175] Popular in Germany. May interfere with effectiveness of other drugs.[176]
  • St John's wort may cause cataracts in people exposed to visible or ultraviolet light after taking it.[177] Other side effects may include gastrointestinal disturbances, allergic reactions, fatigue, dizziness, confusion, dry mouth, photosensitivity[66], mania and psychosis[11]

[edit] T

  • Used topically (and is effective) for fungal infections, acne, and athlete's foot.[178] Tea tree oil is, however, less effective than medications for curing athlete's foot.[178]
  • Side effects may include skin irritation and swelling, and "in people with acne, it can sometimes cause skin dryness, itching, stinging, burning, and redness."[178] Applying products containing both tea tree and lavender oil to prepubescent boys may cause gynecomastia (larger breasts).[178] Tea tree oil is highly toxic when ingested, even in small quantities, so it should never be taken by mouth.
  • 'Nuff said.

[edit] V

  • Valerian (Valeriana officinalis)
  • May work for insomnia.[179]
  • Side effects may include headache, excitability, uneasiness, and, in some cases, insomnia.[179] Some multi-herb remedies containing valerian have been linked to liver damage.[180]
  • Venus fly-trap (Dionaea Muscipula)
  • Active ingredient plumbagin, claimed to boost the immune system (see Carnivora)
  • Possible side effects of plumbagin are diarrhea, skin rash, liver damage, and abnormal blood counts.[181]

[edit] W

  • Willow bark (Salix spp.)
  • Used for pain relief (and is effective, obviously).
  • Side effects may include: stomach upset, digestive system upset, itching, an increased risk of children developing Reyes syndrome, ulcers, stomach bleeding, and liver toxicity.[182][183][184] (No better than aspirin, then.) Side effects from overdosing may include skin rash, stomach inflammation/irritation, nausea, vomiting, kidney inflammation, and tinnitus (ringing in the ears).[183] Willow bark can be anywhere from 0.08% to 12.6% salicin (the active ingredient).[183]
  • Wintergreen (Gaultheria procumbens)
  • Insufficient research to evaluate efficacy.[185] Used for asthma, rheumatism, and headache.[186]
  • Wintergreen is safe, but internally taken wintegreen oil is toxic and can cause ringing in the ears, nausea, vomiting, diarrhea, headache, stomach pain, confusion, and death.[185][187] (Wintergreen oil contains methyl salicylate, and 5 mL of the oil is equivalent to about 21.5 aspirin tablets.)[187] Topical use can cause skin irritation.[185]
  • Woad (Isatis tinctoria)
  • In addition to producing a blue dye, woad has alleged medicinal uses. Chemicals from woad might be used to prevent cancer, as woad can produce high levels of glucobrassicin.[188] Young leaves when damaged can produce more glucobrassicin, up to 65 times as much.[189]
  • Indigo woad Root is a traditional Chinese medicine herb that comes from the roots of woad, but often incorrectly listed under the synonymic name, Isatis indigotica. It is also known as Radix isatidis. The herb is cultivated in various regions of northern China. The roots are harvested during the autumn and dried. The dried root is then processed into granules, which are most commonly consumed dissolved in hot water or tea. The product, called Banlangen Keli, is very popular throughout China, and used to remove toxic heat, soothe sore throat and to treat influenza, measles, mumps, syphilis, or scarlet fever. It is also used for pharyngitis, laryngitis, erysipelas, and carbuncle, and to prevent hepatitis A, epidemic meningitis, cancer and inflammation.[citation needed]
  • Possible minor side effects include allergic reactions and dizziness; only large dosages or long term usage can be toxic to the kidneys.
  • Wormwood (Artemisia absinthium)
  • Used in: vaginal steaming
  • Used for intestinal worms (but is not effective).[190]
  • Side effects of large doses may include nausea, vomiting, stomach pain, headache, dizziness, seizures, numbness of the legs and arms, delirium, paralysis, and kidney and liver failure.[190]
  • Wormwood is neuroprotective below threshold concentrations of thujone (e.g. as it occurs in absinthe), but is neurotoxic above the threshold so caution should be exercised for therapeutic usage.[191]
  • Wormwood has been used to treat uncomplicated malaria, but like all known chemical treatments for malaria, it can cause resistance.[192]

[edit] Y

  • Yerba mate: See Mate

[edit] Multi-herb mixtures

This list is mainly for TCM remedies that consist of multiple plants.

[edit] F

  • Fo ti: See he shou wu

[edit] H

  • He shou wu
  • Claimed to be a cure for baldness and grey hair, as well as being promoted as a immune system booster (though he shou wu contains emodin, a possibly immunosuppresant substance).[193] There's not enough evidence to evaluate claims.[193]

[edit] J

  • Jin bu huan
  • Used as a sedative and analgesic, and for asthma, bronchitis, night blindness, delirium, epilepsy, vertigo, fever and inflammation.[194] The herbs used vary, but can include Lycopodium serratum, Panax, Pseudo ginseng, Polygala chinensis and two species of Stephania.[194]
  • May cause hepatitis.[194] It is sometimes contaminated with lead.[195][196]

[edit] L

  • Long dan xie gan wan: See Xie gan wan

[edit] X

  • Xie gan wan (also known as Long dan xie gan wan)
  • Used for acne, among other things. It contains birthwort and can cause kidney failure and cancer.[197]

These treatments have not generally been evaluated clinically.

[edit] See also

[edit] External links

[edit] Notes

  1. There are without a doubt many traditional remedies whose (possibly serious) adverse effects are completely unknown. It's interesting to note that traditional medicine can use carcinogenic and hepatotoxic plants for millenia without detecting their side effects. If a herb really is good for something, the beneficial compounds can be used as drugs, while leaving the toxic ones behind; thus the patient gets the benefits of the herb without the unnecessary risks.

[edit] Footnotes

  1. Aconite, altMD.
  2. ACONITE, WebMD.
  3. 3.0 3.1 ACONITE, WebMD.
  4. 4.0 4.1 Aloe, Cancer.org.
  5. Toxicology and Carcinogenesis Studies of a Noncolorized Whole Leaf Extract of Aloe barbadensis Miller (Aloe Vera) in F344/N Rats and B6C3F1 Mice
  6. Skullcap, Herbs2000.com.
  7. 7.0 7.1 7.2 Skullcap, University of Maryland Medical Center.
  8. Skullcap, LiverTox.com.
  9. 9.0 9.1 9.2 Arnica, Cancer.org.
  10. 10.0 10.1 10.2 10.3 Ginseng, WebMD.
  11. 11.0 11.1 Mania and Psychosis Associated with St. John's Wort and Ginseng
  12. Bozin B, Mimica-Dukic N, Simin N, Anackov G (March 2006). "Characterization of the volatile composition of essential oils of some lamiaceae spices and the antimicrobial and antioxidant activities of the entire oils". J. Agric. Food Chem. 54 (5): 1822–8. Template:Citation error. PMID 16506839. 
  13. Chiang LC, Ng LT, Cheng PW, Chiang W, Lin CC (October 2005). "Antiviral activities of extracts and selected pure constituents of Ocimum basilicum". Clin. Exp. Pharmacol. Physiol. 32 (10): 811–6. Template:Citation error. PMID 16173941. 
  14. de Almeida I, Alviano DS, Vieira DP, et al. (July 2007). "Antigiardial activity of Ocimum basilicum essential oil". Parasitol. Res. 101 (2): 443–52. Template:Citation error. PMID 17342533. 
  15. Manosroi J, Dhumtanom P, Manosroi A (April 2006). "Anti-proliferative activity of essential oil extracted from Thai medicinal plants on KB and P388 cell lines". Cancer Lett. 235 (1): 114–20. Template:Citation error. PMID 15979235. 
  16. http://webmd.com/vitamins-supplements/ingredientmono-303-BASIL.aspx?activeIngredientId=303&activeIngredientName=BASIL
  17. Bilberry: Science and Safety NCCAM
  18. bilberries at WebMD
  19. Aristolochic Acid: FDA Concerned About Botanical Products, Including Dietary Supplements, Containing Aristolochic Acid, FDA, May 31, 2000.
  20. 20.0 20.1 20.2 Chung-Hsin Chena, et al. "Aristolochic acid-associated urothelial cancer in Taiwan." Proceedings of the National Academy of Sciences. 2012 April 9.
  21. "Study blames herb for high cancer rate." Taipei Times. 2012 April 11.
  22. Aristolochic acid nephropathy: A worldwide problem by Debelle et al. Kidney International (2008) 74, 158–169; doi:10.1038/ki.2008.129
  23. Aristolochic acid nephropathy: A worldwide problem
  24. 24.0 24.1 BITTER ORANGE, WebMD.
  25. But then, what herb isn't claimed to cure cancer?
  26. Black walnut, Cancer.org.
  27. Chinese Herbs A to E
  28. [1]
  29. 29.0 29.1 29.2 29.3 Betel nut (Areca catechu L.), Wellness.com.
  30. Betel Nut, InteliHealth.
  31. "IARC Monographs Programme finds betel-quid and areca-nut chewing carcinogenic to humans." World Health Organization. 2003 August 7.
  32. Jenny Chou. "Chewing betel nuts now a serious matter: DOH." Taipei Times. 2005 December 6.
  33. Betel quid use in relation to infectious disease outcomes in Cambodia
  34. BLACK COHOSH, WebMD.
  35. 35.0 35.1 35.2 Celandine, Cancer.org.
  36. 36.0 36.1 36.2 36.3 GREATER CELANDINE, WebMD.
  37. Celandine - Herb Database + Images
  38. Necrotizing hepatitis after taking herbal remedies at Pubmed.
  39. 39.00 39.01 39.02 39.03 39.04 39.05 39.06 39.07 39.08 39.09 39.10 39.11 http://umm.edu/health/medical/altmed/herb/roman-chamomile
  40. 40.00 40.01 40.02 40.03 40.04 40.05 40.06 40.07 40.08 40.09 40.10 40.11 40.12 40.13 40.14 40.15 40.16 http://umm.edu/health/medical/altmed/herb/german-chamomile
  41. 41.0 41.1 Chaparral, Nature's Detergent
  42. 42.0 42.1 42.2 Chaparral, Cancer.org.
  43. 43.0 43.1 CHRYSANTHEMUM, WebMD.
  44. This is a reference of the claim to cure, please don't try these recipes.
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