However, this peptide has been on the World Anti-Doping Agency (WADA) prohibited list under Class S0 (Non-Approved Substances) since 2022
doi: 10.1007/s00709-002-0064-1 2 AlexT
it is naturally occurring, nontoxic, and is active at a very low nanomolar concentration.11 Another piece of research described GHK-Cu as a safe, inexpensive, extensively studied compound.3 These conclusions primarily apply to topical GHK-Cu, but even with injectables, the lack of serious adverse events in animal subjects points to a general tolerability regardless of the route of administration
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