"These statements have not been evaluated by the FDA (U.S. Food & Drug Administration). Our products are not intended to diagnose, cure or prevent any disease."
You will see this warning on every supplement bottle you purchase. WHY? The FDA regulates dietary supplements under a different set of regulations than those covering "conventional" foods and prescription and over-the-counter drug products. Under the Dietary Supplement Health and Education Act of 1994 (DSHEA), the dietary supplement manufacturer, not the FDA, is responsible for ensuring that a dietary supplement is safe before it is marketed. The manufacturers do not need to register their products with FDA nor get FDA approval before producing or selling dietary supplements.
Want to learn more info, perhaps about the supplement you've been taking? Check out the following websites.
USDA - Food & Nutrition Center - Dietary Supplements
Consumer Reports - Dietary Supplements