WADA.

The World Anti-Doping Agency, which sets the prohibited-substance list.

The World Anti-Doping Agency maintains the Prohibited List, the internationally recognised catalogue of substances and methods banned in sport, which is revised annually and adopted by sporting bodies and national anti-doping organisations. Peptides feature prominently on it. Growth-hormone-releasing factors and their analogs, growth-hormone secretagogues, growth hormone itself, IGF-1 and its analogs, and various peptide hormones all appear in the relevant categories, and several classes are prohibited at all times rather than only in competition. Some categories are written broadly enough to capture compounds by mechanism, meaning a substance can be prohibited without being named individually. Two features of anti-doping rules regularly surprise people. Athletes are held to strict liability, which means they are responsible for what is in their body regardless of how it got there, so contamination of a supplement or a mislabelled product is not a defence in itself. And a compound being unapproved or research-use-only does not put it outside the rules; if anything, the list explicitly covers substances with no current regulatory approval for human use. Anyone competing under an anti-doping code needs to check the current version of the list themselves, since it changes and this page is not a compliance resource.