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How GHK-Cu Works At its core, GHK-Cu is a naturally occurring peptide made up of three amino acids bound to copper

WADA does not state why it has banned BPC-157, but presumably there are concerns about the lack of research into its safety and the (also unresearched) possibility that it does indeed enhance athletic performance

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Davis TN, OReilly MF, Kang S, Lang R, Rispoli M, Sigafoos J, Lancioni GE, Copeland D, Attai S, Mulloy A (2012) Chelation treatment for autism spectrum disorders: a systematic review

Namely, short-acting peptides, such as GHRP-6, are typically cleared from the body within 1224 hours, while long-acting peptides like PEG-MGF can remain detectable for up to 12 weeks after administration