Look for the G.M.P. (Good Manufacturing Practices) on the label. These are supplements that have regularly passed testing by the dietary industry as well as the F.D.A. Read as much as you can by various authors as you will see there is controversy between the pharmaceutical and the dietary supplement people. We believe in the dietary supplement industry, we are primarily interested in your health rather than supporting the Multi-Trillion Pharmaceutical industry that is more interested in managing your health rather than a cure.