Wellness is often used as a woo version of "health". Quacks like to claim that their woo will promote healing and stimulate wellness, in the hope that you will be deluded into thinking they are in some way related to health. For example, a company called "GIA Wellness" sells products that claim to "optimize health and well being" but it turns out on inspection to be just another MLM
scam scheme flogging "Statements made about any products… have not been evaluated by any governmental agencies" (a.k.a. the "quack Miranda warning").
Exceptions to the use of "wellness" in the woo sense are the website Berkeley Wellness and it sister publication the Wellness Letter, which are published by the University of California at Berkeley School of Public Health, and report evidence-based wellness information on health.