Certified Supplements for Athletes: Lists and Databases

For a tested athlete, a contaminated protein powder or pre-workout can end a career as surely as deliberate doping. Under the strict liability principle, the athlete is responsible for whatever is found in their sample. Certification programmes and databases exist to reduce that risk. Our editors explain how they work, what they can and cannot guarantee, and how to use them sensibly in the UK.

Why supplements are a doping risk

Supplements are regulated as foods in the UK, not as medicines. They do not require pre-market approval for safety or purity, and enforcement relies largely on local authorities and the Food Standards Agency acting after problems emerge.

Research has shown that contamination is a real, not theoretical, problem. An international study led by Geyer and colleagues, published in 2004, found that a notable proportion of non-hormonal supplements tested contained undeclared anabolic steroids. Later reviews, including one by Outram and Stewart, confirmed the issue across different markets.

In the United States, Tucker and co-authors analysed FDA warnings and found hundreds of supplements containing unapproved pharmaceutical ingredients, most often in products marketed for sexual enhancement, weight loss or muscle building. Cohen and colleagues showed that some products still contained banned drugs after recalls.

For athletes, the IOC consensus statement on dietary supplements recommends a "food first" approach and, where supplements are justified, choosing products that have been independently batch-tested.

Main certification programmes

Several third-party schemes test supplements for substances on the WADA Prohibited List. They differ in method, scope and geography, but the core idea is the same: samples from manufactured batches are analysed in an accredited laboratory, and the products are listed publicly.

Informed Sport, operated by LGC with its laboratory in Cambridgeshire, tests every batch before release and lets users search the batch number on its website. Its sister programme, Informed Choice, tests products on a regular sampling basis rather than every batch.

The Banned Substances Control Group (BSCG) and NSF Certified for Sport are widely used in North America and recognised by many professional leagues. The Cologne List (Kölner Liste), based in Germany, publishes products that have been tested by a partner laboratory.

UK Anti-Doping (UKAD) does not endorse any specific product, but it encourages athletes to use batch-tested supplements and to carry out their own risk assessment.

Databases for medicines vs supplements

It is important to distinguish between databases for medicines and those for supplements. Global DRO, supported by UKAD and several other national anti-doping organisations, lets athletes check whether a specific licensed medicine bought in the UK is prohibited in or out of competition.

Global DRO does not cover supplements. A supplement will not appear there, and a "not found" result means nothing about its safety.

If an athlete needs a medicine that is prohibited for a genuine medical reason, the correct route is a Therapeutic Use Exemption (TUE), not a supplement alternative.

In practice, a sensible check before using any product involves several steps:

1. confirm that you actually need the supplement, ideally with a sports dietitian;
2. check whether the product is listed by a recognised testing programme;
3. verify the batch number of the specific tub you own, where the scheme allows it;
4. keep the packaging, receipt and a sealed sample from the same batch;
5. record your use on the doping control form if tested.

Limits of certification

Certification reduces risk but cannot eliminate it. Laboratories test for a defined list of substances with specific detection limits; a contaminant outside that list, or below detection limits but still enough to trigger a positive in urine, could theoretically be missed.

Certification also says nothing about whether a supplement works. A batch-tested fat burner may be free of prohibited substances and still be useless — or contain stimulants that are legal but poorly tolerated.

Counterfeit products are another risk. Products bought from marketplaces or unofficial sellers may carry certified logos without being genuine, so buying from reputable retailers and checking batch numbers matters.

Finally, a certified product does not protect an athlete legally if a positive test occurs. It may help demonstrate lack of fault or negligence, which can reduce sanctions, but strict liability still applies.

Editorial conclusions

For tested athletes in the UK, independent batch testing is the most practical tool for reducing the doping risk from supplements. Informed Sport, Informed Choice, BSCG, NSF and the Cologne List all serve this purpose, with differences in method.

At the same time, certification is not a guarantee. The safest strategy combines a food-first approach, minimal and justified supplement use, verified batches and careful record-keeping.

Global DRO is for medicines only; supplements must be checked through certification schemes, and any medical need for a prohibited substance is handled through a TUE.

Readers may also be interested in our articles on how strict liability works in anti-doping, on stimulants that appear in pre-workout products and on applying for a Therapeutic Use Exemption.

References

1. Maughan RJ, Burke LM, Dvorak J, et al. IOC consensus statement: dietary supplements and the high-performance athlete. Br J Sports Med. 2018;52(7):439–455.
2. Geyer H, Parr MK, Mareck U, et al. Analysis of non-hormonal nutritional supplements for anabolic-androgenic steroids — results of an international study. Int J Sports Med. 2004;25(2):124–129.
3. Outram S, Stewart B. Doping through supplement use: a review of the available empirical data. Int J Sport Nutr Exerc Metab. 2015;25(1):54–59.
4. Tucker J, Fischer T, Upjohn L, et al. Unapproved pharmaceutical ingredients included in dietary supplements associated with US Food and Drug Administration warnings. JAMA Netw Open. 2018;1(6):e183337.
5. Cohen PA, Maller G, DeSouza R, Neal-Kababick J. Presence of banned drugs in dietary supplements following FDA recalls. JAMA. 2014;312(16):1691–1693.
6. World Anti-Doping Agency. World Anti-Doping Code. Montreal: WADA; 2021.