Peptide Knowledge Base · Cosmetic

GHK-Cu (topical): what it is, what the evidence says, and its real status

The copper peptide your serum already brags about.

Can you actually get it?

Plain-English verdict: Available.

Regulatory status: Legal, cosmetic / topical.

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 — Mixed / early human evidence.

topical/cosmetic and cell-culture evidence; injectable claims are a separate question

A grade measures how much human evidence exists, not whether a molecule is good, safe, or worth your interest. 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 for status.

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Last reviewed Jun 16, 2026 · Peptós.LIFE · Not medical advice.