Their products
A quick search  shows that the bulk of their products are pseudovitamins that give in to the latest fad diet and nutrition crazes, such as selling products loaded with vitamin D and resveratrol. Like the makers of HeadOn, their products are promoted heavily on radio and television, although (unlike HeadOn) usually through infomercials. Purity Products also likes to brand their products as "evidence-based," even though they have released no studies or data to back such claims. Though their Advisory Panel seems about as full of crankery as you can get.
 Customer satisfaction
Apparently, they do not have a good track record with their customers either,  and not just because their products are loaded with more woo than help. They even have to have a webpage dedicated to responding to accusations they are scam artists.