What does the evidence show about GHK-Cu (copper peptide)'s effects?

Read Off Label rates the evidence for GHK-Cu (copper peptide) as Moderate and the benefit magnitude as moderate, producing an overall grade of B+ (7.1/10). Canonical 'anti-aging peptide.

What safety findings are reported for GHK-Cu (copper peptide)?

GHK-Cu (copper peptide) has a low risk profile in the database. Low (mild irritation in some; green-blue staining common at high concentrations) Legal status: OTC (topical); injectable formerly compounded — now Category 2 on FDA 503A list for injection (prohibited).

Rankings / Longevity — Peptides

GHK-Cu (copper peptide)

Longevity · Peptide

Tier B+

Reviewed by Read Off Label · Last reviewed Jun 8, 2026 · How we grade

peptideanti-inflammatoryotcresearch-only

7.1 / 10

Tier B+

Ev 6 Bn 5 Sf 9

Bottom line

Read Off Label grades GHK-Cu (copper peptide) as B+ (7.1/10) based on moderate evidence, moderate benefit magnitude, and a low-risk safety profile.

Canonical 'anti-aging peptide.

Studied, labeled, or reported-use context: 0. — OTC (topical); injectable formerly compounded — now Category 2 on FDA 503A list for injection; not individualized guidance.

What the evidence says

Canonical 'anti-aging peptide.' Topical use retains commercial availability (various skincare brands); injectable is now prohibited from US compounding. Pickart 2015 review aggregates most of the evidence base. Pairs poorly with vitamin C (copper catalyzes C oxidation) — separate AM/PM.

Mechanism

Tripeptide (Gly-His-Lys) with copper affinity; stimulates collagen/elastin/glycosaminoglycan synthesis; anti-inflammatory; promotes wound healing and hair follicle stimulation

Studied, labeled, or reported dose & route

0.1-5% topical applied to clean skin

This records doses and routes described in studies, approved labeling, clinical practice, or documented use. It is not individualized guidance and does not establish safety; context changes with indication, formulation, health history, monitoring, and other medicines.

Citations

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Common questions

What does the evidence show about GHK-Cu (copper peptide)'s effects?: Read Off Label rates the evidence for GHK-Cu (copper peptide) as Moderate and the benefit magnitude as moderate, producing an overall grade of B+ (7.1/10). Canonical 'anti-aging peptide.
What safety findings are reported for GHK-Cu (copper peptide)?: GHK-Cu (copper peptide) has a low risk profile in the database. Low (mild irritation in some; green-blue staining common at high concentrations) Legal status: OTC (topical); injectable formerly compounded — now Category 2 on FDA 503A list for injection (prohibited).
What doses or routes are reported for GHK-Cu (copper peptide)?: 0.1-5% topical applied to clean skin This is context from studies, approved labeling, clinical practice, or documented use; it is not individualized guidance and does not establish safety.
How does GHK-Cu (copper peptide) work?: Tripeptide (Gly-His-Lys) with copper affinity; stimulates collagen/elastin/glycosaminoglycan synthesis; anti-inflammatory; promotes wound healing and hair follicle stimulation

This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.