Claimed effect · GHK-Cu

Does GHK-Cu help with skin appearance?

C
Grade C — weak human evidence3–4 small trials · effect size: small
Short answerWeak human evidence. 3–4 small trials: enough to be interesting, not enough to count on. Where an effect is seen it is a small effect. Twelve-week facial studies in the late 1990s and early 2000s reported improved skin laxity, clarity and fine lines versus vehicle or comparators. Small, short, largely industry-run.

What the studies show

Twelve-week facial studies in the late 1990s and early 2000s reported improved skin laxity, clarity and fine lines versus vehicle or comparators. Small, short, largely industry-run.

A few small or poorly-controlled human studies. Enough to be interesting; not enough to count on. Most of what gets called “clinically proven” online lives here.

  1. 1
    Pickart L, Margolina A. Regenerative and protective actions of the GHK-Cu peptide in the light of the new gene data.Int J Mol Sci, 2018;19:1987 (review)Review by the peptide's discoverer; declared interest.
  2. 2
    Leyden JJ, et al. Skin care benefits of copper peptide containing facial cream.American Academy of Dermatology meeting, 2002 (abstract)Twelve-week facial study; conference abstract, industry-supported.

In context

GHK-Cu is a naturally occurring three-amino-acid peptide that binds copper, found in plasma, saliva and urine, with levels that fall with age. Applied to skin in creams it has modest evidence from small trials for improving fine lines and skin firmness, which is why it is a common cosmetic ingredient. Injected use — increasingly promoted online — has no human evidence of any kind.

GHK-Cu is cosmetic ingredient. Legal status differs by country — see the regulation section or the jurisdiction pages.

Questions

Is GHK-Cu proven to help with skin appearance?
No. The human evidence is weak (3–4 small trials); LYO grades it C.
What studies are behind the grade?
Twelve-week facial studies in the late 1990s and early 2000s reported improved skin laxity, clarity and fine lines versus vehicle or comparators. Small, short, largely industry-run.
Is GHK-Cu approved for this?
No. GHK-Cu is cosmetic ingredient; it is not an approved medicine for any indication in the jurisdictions LYO covers.

Other outcomes for GHK-Cu

Reviewed 2 September 2026. Grades count human evidence only; see how LYO grades. Not medical advice. Correct this page →