Adverse outcomes from muscle-building supplements can occur when the products are labeled deceptively. For example, what is sold as creatine sometimes contains other ingredients that may be harmful, such as deterenol or oxilofrine, which are not approved for use in the United States.
Words like “proprietary,” “blend,” or “complex” on a supplement label should raise red flags, according to Pieter Cohen, MD, associate professor at Harvard Medical School, Boston, and an internist at the Cambridge Health Alliance who advises clinicians and patients about the safe use of dietary supplements.
Unlike for pharmaceuticals, the US Food and Drug Administration (FDA) is not authorized to assess the safety of dietary supplements before they are sold to consumers. Supplement manufacturers are not required to disclose the quantity of each ingredient in a proprietary blend on product labels. By one estimate, 23,000 emergency department visits annually in the United States are due to adverse effects from dietary supplements, ranging from cardiac trouble to swallowing difficulties.
In general, Dr. Cohen said, supplements with fewer than six ingredients that have been certified by a third party are more likely than others to be safe. The Department of Defense provides a scorecard for consumers to help decipher which supplements are safer to use.
“American consumers are the lab rats for these products,” said Bryn Austin, ScD, SM, professor of social sciences at the Harvard T.H. Chan School of Public Health, Boston, and director of a program that trains health professionals how to intervene to prevent eating disorders. “This industry invests a lot of money to invent a health halo for themselves. Muscle-building supplements can be downright dangerous and will not turn anyone into the elite athlete of their dreams.”
The commentary authors reported no financial disclosures.
A version of this article first appeared on Medscape.com.