Are peptides banned in sport? What athletes should check

First check: which rules apply to you?

The 2026 WADA list places BPC-157 among non-approved substances prohibited at all times. It names TB-500 among thymosin beta-4 derivatives and lists CJC-1295, ipamorelin and tesamorelin in different growth-hormone-related categories also prohibited at all times. These are examples, not an exhaustive list: substances can be covered by a class even if not individually named. Explore the evidence for BPC-157, TB-500 and CJC-1295.

For a related question, compare ipamorelin and MK-677: shared signals and different evidence.1

Do the rules apply to everyone and every date?

WADA rules apply through organisations and competitions that adopt them; a reader must check the rules of their own federation and anti-doping authority. “At all times” covers both competition and training periods under the relevant code. A prohibition is not by itself a judgment that a product is medically ineffective or illegal in every country. USADA says the 2027 WADA list takes effect on 1 January 2027 and changes language about non-approved substances. This page was checked on 4 November 2026; recheck the list in force for the actual date and event.12

What if a medicine is prescribed?

Medical approval and sport eligibility are separate. For example, tesamorelin has a specific US medical indication but appears on the 2026 prohibited list. A prescription alone is not automatically a therapeutic-use exemption (TUE). An athlete who needs a prohibited medicine should ask their applicable anti-doping organisation about the process, timing and criteria; an exemption is not guaranteed. Do not stop a prescribed treatment without discussing it with the clinician.13

Can a supplement label or certificate guarantee eligibility?

No. A supplement can contain an undisclosed prohibited substance, and a seller-defined stack may not have a standard composition. Third-party certification can reduce some risks but cannot eliminate them or establish that every product is permitted for every athlete. A certificate of analysis has its own limits: see what a laboratory certificate can show. USADA provides supplement guidance in Further reading; athletes should also check their own authority’s resources.4

How should a reader check?

Identify the exact medicine, ingredients, brand, country and date; check the current WADA list and consult the anti-doping authority for the athlete’s sport and event. USADA points its athletes to Global DRO (see Further reading) for medication and ingredient status, but a missing entry does not prove that a substance or supplement is permitted. Ask the relevant authority about uncertainty and medical exemptions. This article cannot issue an eligibility decision.23