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# Many Supplements Stay on Market After FDA Warning
- URL: https://www.fdaweb.com/many-supplements-stay-on-market-after-fda-warning/
- Published: 2022-07-26T12:00:00.000Z
- Updated: 2026-09-14T17:53:21.000Z
- Author: David McFarland
- Tags: Drugs, #legacy-id-D5152370

Researchers from Cambridge Health Alliance and the University of Mississippi say that after FDA issued Warning Letters targeting specific dietary supplement products, 29% remained available for purchase, with most containing a prohibited ingredient. The researchers looked at FDA Warning Letters targeting the presence of BMPEA or DMHA in 31 supplements. Only one of the 31 was recalled by the manufacturer, they say.

Nine of the products (29%) remained available for purchase online a mean of six years after the Warning Letters were issued. Four of the nine available products listed the presence of at least one prohibited ingredient on the label, the researchers [say](https://jamanetwork.com/journals/jama/fullarticle/2794578?guestAccessKey=69969eab-09a8-4bba-a3e2-8cf2d51ab927&utm%5Fsource=For%5FThe%5FMedia&utm%5Fmedium=referral&utm%5Fcampaign=ftm%5Flinks&utm%5Fcontent=tfl&utm%5Fterm=072622). After chemical analysis, five of the nine products were found to contain at least one FDA-prohibited ingredient. Two products contained the same prohibited ingredient that led to the Warning Letter.

“This study raises questions regarding FDA’s actions to ensure that manufacturers are compliant with the agency’s Warning Letters,” the article concludes. “FDA should consider ways to ensure that prohibited drugs are removed from supplements, perhaps by testing products sold after Warning Letters and mandating recalls whenever products remain adulterated.”