- Obsessive Compulsive Behavior
Though they are not as stringent as the FDA, there are two accredited watchdog organizations, Consumer Lab (CL), and U.S. Pharmacopeia (USP) that perform testing of supplements. Each site lists those that have passed tests for purity. Note that Consumer Lab tests a greater range of products. Each product mentioned on this site has been (at least) Consumer lab approved.
Be absolutely sure that any formulation (brands and name products) you get across the counter or on the web is Consumer Lab (CL) or U.S. Pharmacopeia (USP) approved. If the product is approved by one of these organizations, you may see one or more of these labels on the product.