Dietary Supplements: How Family Physicians Can Address Safety Concerns by Working with the FDA


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Am Fam Physician. 2016 Jan 15;93(2):97-98.

The nation's physicians rely on the U.S. Food and Drug Administration (FDA)—the first consumer health protection agency created following the Pure Food and Drug Act of 1906—to safeguard all medical products prescribed for our patients. However, the FDA continues to have only limited oversight of more than 85,000 dietary supplements of uncertain effectiveness or safety, often used by patients without their family physician's knowledge.

That is why it was troubling to hear of the death of a healthy 18-year-old Ohio student attributed to an acute cardiac arrhythmia from an unintentional overdose of caffeine.1,2 The student athlete ingested about 1 teaspoon of a powdered caffeine product to enhance exercise performance, inadvertently consuming the equivalent of more than 30 cups of strongly brewed coffee in a single dose. Members of Congress and a respected food safety group, the Center for Science in the Public Interest, have called for FDA action to ban all bulk caffeine products sold directly to patients.3,4 In December 2014, the FDA announced that it was looking into this product safety issue and working on next steps.5 Since then, it has issued warning letters to several powdered caffeine manufacturers and updated its dietary supplements web page to include information on safety concerns for powdered caffeine products.6

Caffeine is regulated by the FDA as a food additive, dietary supplement, and drug, and it remains available for sale online in formulations that are dangerous because of the inability of our patients to determine a safe dose without a measuring scale. Promoted widely for its noticeable ergogenic effect during high-intensity exercise (e.g., weight training), powdered caffeine is used by adolescent athletes in the hope of enhancing workout performance.79 The 100- to 300-g containers sold online for $20 or less include 10 to 30 lethal doses of powdered caffeine.

Your patients are likely using some type of dietary supplement, whether they tell you or not. More than one-half of U.S. adults consume a dietary supplement daily, with use growing steadily over the past decade.10 Many supplements that claim to enhance specific elements of health (e.g., stamina, sexual performance, bone joint health, mental acuity) are found to be ineffective for the purported benefit or found to be toxic, harmful, or even deadly.11,12

Few patients or physicians understand that the FDA does not have the authority under current law to approve or monitor dietary supplements in the same rigorous fashion as its postmarket surveillance of prescription drugs.13 In contrast, consider the antihypertensive medication that you prescribed today. The FDA can assure you and your patient that the drug dispensed by the pharmacy is of the quality, security, and integrity expected in the United States—safe when used as specified in the prescribing information approved by the FDA.

The Dietary Supplement Health and Education Act (DSHEA) of 1994 made supplement manufacturers responsible for ensuring that their products are safe, essentially using an honor system. The supplement that your patient is taking under DSHEA is presumed to be safe and effective; manufacturers do not need FDA approval before selling their product. The FDA mainly depends on physicians and patients to recognize and report unexpected safety issues. This must occur before any steps can be taken to evaluate the safety signal, create a risk mitigation plan, warn the public of newly discovered safety concerns, and, if risk mitigation fails, remove the supplement from the market.14

Under authority recently granted by Congress, the FDA can now require dietary supplement manufacturers to report a serious adverse event when they become aware of it. Unfortunately, no active surveillance is required by the manufacturer,15 and it is estimated that the FDA receives reports for less than 1% of all serious adverse events associated with dietary supplement use.16,17

Under these constraints and faced with limited resources, the FDA has implemented a program that monitors products pulled from store shelves or sold online with claims for weight loss, improved sexual performance, and muscle growth. The agency is identifying many products that are sold with claims to be supplements but that instead have been adulterated with undeclared prescription drug ingredients, including corticosteroids, phosphodiesterase type 5 inhibitors, or sibutramine.18 Serious drug-drug interactions leading to hypertension or hepatic or cardiac toxicity have been documented.19,20

What can a physician do to support and protect patients from harm if they choose to use readily available dietary supplements? Don't expect a change in law or regulation anytime soon that would permit the type of monitoring we count on from the FDA to keep our prescription and over-the-counter medications safe. Instead, the FDA will continue to rely on primary care physicians to counsel and educate patients about supplement use. In recent years, excellent science-based information, including quick health professional references and patient fact sheets, has become easily accessible online from federal agencies and private sources.2124 Most importantly, the FDA needs the active support of physicians in identifying and voluntarily reporting suspected serious adverse events or product quality concerns to MedWatch, the FDA reporting program (http://www.fda.gov/Safety/MedWatch/). These reports can then trigger the investigation, evaluation, and risk mitigation actions that can avert future patient harm from dietary supplement use.

Address correspondence to Norman S. Marks, MD, MHA, at normarks@gmail.com. Reprints are not available from the author.

Author disclosure: No relevant financial affiliations.


show all references

1. U.S. Food and Drug Administration. FDA consumer advice on powdered pure caffeine. http://www.fda.gov/food/recallsoutbreaksemergencies/safetyalertsadvisories/ucm405787.htm. Accessed March 19, 2015....

2. Mientka M. FDA warns of powdered caffeine's potentially lethal effects after accidental overdose, death of teen boy. Medical Daily. July 19, 2014. http://www.medicaldaily.com/fda-warns-powdered-caffeines-potentially-lethal-effects-after-accidental-overdose-death-teen-boy. Accessed March 19, 2015.

3. Center for Science in the Public Interest. FDA should ban retail sale of bulk caffeine, says CSPI. December 9, 2014. http://cspinet.org/new/201412091.html. Accessed March 19, 2015.

4. Charles E. Schumer United States Senator for New York. Following several tragic deaths, Schumer calls on the FDA to ban powdered caffeine [press release]. February 10, 2015. http://www.schumer.senate.gov/newsroom/press-releases/following-several-tragic-deaths-schumer-calls-on-the-fda-to-ban-powdered-caffeine_one-teaspoon-of-concentrated-powdered-caffeine-is-equivalent-to-25-cups-of-coffee-and-is-highly-dangerous-for-teens--young-adults-. Accessed March 19, 2015.

5. Landa MM; U.S. Food and Drug Administration. Tragic deaths highlight the dangers of powdered pure caffeine. December 16, 2014. http://blogs.fda.gov/fdavoice/index.php/2014/12/tragic-deaths-highlight-the-dangers-of-powdered-pure-caffeine/. Accessed March 19, 2015.

6. U.S. Food and Drug Administration. FDA takes action on bulk pure powdered caffeine products. September 1, 2015. http://www.fda.gov/food/newsevents/constituentupdates/ucm460097. Accessed November 16, 2015.

7. Cole KJ, et al. Effect of caffeine ingestion on perception of effort and subsequent work production. Int J Sport Nutr. 1996;6(1):14–23.

8. Denadai BS, Denadai ML. Effects of caffeine on time to exhaustion in exercise performed below and above the anaerobic threshold. Braz J Med Biol Res. 1998;31(4):581–585.

9. Davis JK, Green JM. Caffeine and anaerobic performance: ergogenic value and mechanisms of action. Sports Med. 2009;39(10):813–832.

10. Bailey RL, Gahche JJ, Miller PE, Thomas PR, Dwyer JT. Why US adults use dietary supplements. JAMA Intern Med. 2013;173(5):355–361.

11. Cohen PA, et al. Presence of banned drugs in dietary supplements following FDA recalls. JAMA. 2014;312(16):1691–1693.

12. Cohen PA. Hazards of hindsight—monitoring the safety of nutritional supplements. N Engl J Med. 2014;370(14):1277–1280.

13. Ashar BH, Rice TN, Sisson SD. Physicians' understanding of the regulation of dietary supplements. Arch Intern Med. 2007;167(9):966–969.

14. Fabricant D; U.S. Food and Drug Administration. FDA uses new authorities to get OxyElite Pro off the market. November 18, 2013. http://blogs.fda.gov/fdavoice/index.php/2013/11/fda-uses-new-authorities-to-get-oxyelite-pro-off-the-market/. Accessed March 19, 2015.

15. Frankos VH, Street DA, O'Neill RK. FDA regulation of dietary supplements and requirements regarding adverse event reporting. Clin Pharmacol Ther. 2010;87(2):239–244.

16. Woo JJ. Adverse event monitoring and multivitamin-multimineral dietary supplements. Am J Clin Nutr. 2007;85(1):323S–324S.

17. Gardiner P, Sarma DN, Low Dog T, et al. The state of dietary supplement adverse event reporting in the United States. Pharmacoepidemiol Drug Saf. 2008;17(10):962–970.

18. U.S. Food and Drug Administration. Tainted products marketed as dietary supplements. http://www.accessdata.fda.gov/scripts/sda/sdNavigation.cfm?sd=tainted_supplements_cder. Accessed March 19, 2015.

19. Centers for Disease Control and Prevention. Notes from the field: acute hepatitis and liver failure following the use of a dietary supplement intended for weight loss or muscle building—May–October 2013. MMWR Morb Mortal Wkly Rep. 2013;62(40):817–819.

20. Fong TL, Klontz KC, Canas-Coto A, et al. Hepatotoxicity due to hydroxycut: a case series. Am J Gastroenterol. 2010;105(7):1561–1566.

21. National Center for Complementary and Integrative Health. Herbs at a glance. https://nccih.nih.gov/health/herbsataglance.htm. Accessed May 22, 2015.

22. National Institutes of Health. Office of Dietary Supplements. Dietary supplement fact sheets. http://ods.od.nih.gov/factsheets/list-all. Accessed May 22, 2015.

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