Lack of oversight and the FDAs stance The FDA has issued safety alerts when they become aware of specific compounding pharmacies operating illegally or notice safety issues, such as increased medication overdoses
A generic product, VSL3, has yielded positive remission studies, as have the probiotic strains Lactobacillus casei and Lactobacillus rhamnosus
The first people who made these drugs, they didn't know if they were going to work, so obviously they took a big risk doing this, but there's much less risk now
Journal of Clinical Endocrinology and Metabolism, 106(2), 388-396
It also shows you how to spot the sites you should walk away from
Rauf A, Imran M, Sulera HAR et al (2017) A comprehensive review of the health perspectives of resveratrol