WADA prohibited peptides 2026: what's on the list and why
The first Enhanced Games took place in Las Vegas on May 24, 2026. Here is the actual WADA list everyone is talking around.
TL;DR
- WADA bans peptides in two main buckets: unapproved substances (S0) and peptide hormones / growth factors (S2).
- Sermorelin and many other popular peptides are prohibited in tested sport. GLP-1 drugs such as semaglutide and tirzepatide are not on the 2026 Prohibited List; WADA monitors them instead.
- The Enhanced Games operates outside WADA — that affects the competition rules, not US regulatory access.
What it is
WADA (in plain English: the World Anti-Doping Agency, the international body that sets the rules for tested sport) publishes an updated Prohibited List every January 1. The list groups banned substances into categories. Peptides land in two main ones: S0 — Unapproved Substances (compounds without regulatory approval anywhere in the world) and S2 — Peptide Hormones, Growth Factors, Related Substances and Mimetics. Think of S0 as a catch-all and S2 as the named list of specific peptide families.
How it works
The classification follows a simple test. If a substance is not approved by any government regulator anywhere for human use, it lands in S0 by default — some popular peptides sit here. If a substance signals the pituitary to release growth hormone, or is itself a growth-related peptide, it lands in S2 — MK-677, sermorelin, and other growth hormone secretagogues live here. GLP-1 receptor agonists like semaglutide and tirzepatide are not on the WADA 2026 list. They are on WADA's 2026 Monitoring Program, which tracks substances that are not prohibited.
Who asks about it
People ask this question when their athletic identity meets their curiosity about peptides. Masters-level runners. Adult-league hockey players. Competitive cyclists who race USA Cycling events. Anyone whose federation enforces WADA rules can be tested, in or out of competition.
What the research says
This is not a research question — it is a regulatory one. The list is updated annually based on a working group's review of three criteria: performance enhancement potential, health risk, and contradicting the spirit of sport. A substance only needs to meet two of three to be added. WADA does not publish individual decision rationale per compound.
What to know before considering it
A "Therapeutic Use Exemption" (TUE) is the only way a tested athlete can legally use a prohibited substance. The TUE bar is high. Recreational use does not exempt anyone — out-of-competition testing applies year-round. Random retroactive testing of stored samples means a substance taken today could trigger a sanction years later.
The Halftime POV
We talk to people who want to feel and function better in midlife — not people chasing world records. For most readers, the WADA list is just useful context. For competitive athletes, it is the entire conversation. We default to honest: if you are tested, the answer is no, regardless of what the science suggests the molecule could do.
Related reading:
Disclaimer
This article is educational and is not medical advice. Compounded medications are not FDA-approved. Clinical outcomes depend on individual factors and require physician evaluation. Results vary.
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Sources
This article discusses compounds whose FDA compounding status has been under review (see our FDA categorization explainer). Halftime Health protocols are prescribed by licensed physicians and dispensed by licensed 503A compounding pharmacies. Compounded drugs are not FDA-approved and have not been evaluated by FDA for safety or effectiveness. This article is provided for educational purposes only and does not constitute medical advice or an offer to sell.
Frequently asked questions
Are unapproved peptides banned by WADA?
Yes. A peptide without regulatory approval anywhere in the world falls on the WADA Prohibited List under S0 — Unapproved Substances. Tested athletes should not use it in or out of competition.
Are growth-hormone-releasing peptides allowed?
No. Sermorelin and similar GHRH or GHRP compounds fall under S2 — Peptide Hormones, Growth Factors, Related Substances and Mimetics. Banned at all times.
What about the Enhanced Games?
The Enhanced Games operate outside WADA jurisdiction and do not enforce the Prohibited List. That doesn't change US regulatory status. As of September 14, 2026, ibutamoren (MK-677) and kisspeptin-10 remain in FDA Category 2. FDA removed several other peptides from Category 2 in 2024 or 2026.
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