Peptide Knowledge Base · Cosmetic
GHK-Cu (topical): what it is, what the evidence says, and its real status
A copper peptide used topically in skin and hair cosmetics.
Short version: the copper peptide your serum already brags about. Topical cosmetic use is well established and available now, and kept strictly separate from any injectable claim.
Can you actually get it?
Plain-English verdict: Available.
Regulatory status: Legal (cosmetic) · Cosmetic use.
Topical cosmetic use is available now. The injectable systemic form is a separate, not-available molecule (an early-2027 review batch), we never let topical legality imply injectable availability.
How does GHK-Cu (topical) work?
A copper-binding tripeptide that supports skin remodeling signaling when applied topically.
What it does — and what it does not do
What it does: Used topically to support skin appearance and hair-care formulations.
What it does not do: Topical cosmetic use is a separate thing from any injectable claim, we never conflate the two.
How honest is the evidence?
Evidence grade C — topical/cosmetic and cell-culture evidence; injectable claims are a separate question. Read our grading methodology for what each grade means.
What we still don't know: Topical absorption and effect sizes vary by formulation; injectable use is not what this entry covers.
WADA status: Not prohibited (topical).
How it is taken
Per cosmetic formulation; topical only.
Who should not take it
Topical: generally well tolerated; patch-test for sensitivity. Injectable systemic use is out of scope and not available.
Sources
Pickart & Margolina, GHK-Cu regenerative actions, Int J Mol Sci 2018
Compounded medications are not FDA-approved. We keep two signals separate and never collapse them: whether you can get something, and what the rule currently says. See the live FDA Peptide Tracker or the knowledge base.
Last reviewed 2026-08-11 · Peptós.LIFE · Not medical advice.