Public discussionGHK-CuCommunity signal · anecdotal
Why does GHK-Cu sometimes cause irritation or staining?
Skin reactions and blue-green staining are frequently reported experiences, with explanations ranging from concentration to formulation.
Where this comes from
Summarised from public peptide discussions. Not posted by PEPTD members, and not medical evidence. Observed in public forum threads. PEPTD summarises the recurring theme — it does not republish anyone's post, profile or identity.
Community experience is anecdotal and is not medical advice. PEPTD does not convert discussion into recommended doses or protocols. Published research and regulatory sources are shown separately from public discussion.