Dr. Chauncey W. Crandall, M.D. is chief of the Cardiac Transplant Program at the world-renowned Palm Beach Cardiovascular Clinic in Palm Beach Gardens, Fla.. He practices interventional, vascular, and transplant cardiology. Dr. Crandall received his post-graduate training at Yale University School of Medicine, where he also completed three years of research in the Cardiovascular Surgery Division. Dr. Crandall regularly lectures nationally and internationally on preventive cardiology, cardiology healthcare of the elderly, healing, interventional cardiology, and heart transplants. Known as the “Christian physician,” Dr. Crandall has been heralded for his values and message of hope to all his heart patients. Dr. Crandall is author of Dr. Crandall’s Heart Health Report newsletter.

Dr. Chauncey W. Crandall, M.D.

Tags: supplements | vitamins | potency | measuring | FDA | USP stamp | standards

Gauging Supplement Potency

By Chauncey Crandall, M.D.   |   Thursday, 09 May 2013 09:58 AM

One of the problems with buying vitamins and supplements is that the Food and Drug Administration does not regulate them the way they regulate prescription drugs. As a result, you may not be getting the potency you expect.

Researchers analyzed 55 different bottles of vitamin D. The pills came from the same manufacturer, but were from different lots. They found potencies as low as 9 percent and as high as 140 percent of the listed dose.

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Although supplement manufacturers don’t have to conform to FDA standards, they can comply with the standards set by the U.S. Pharmacopeial Convention (USP), which helps ensure quality.

When buying your supplements, look for the USP stamp on the bottle.

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