Skin

GHK-Cu (copper peptide): skin benefits, research & how it's used

Research purposes only (injectable) Checked against official sources Oct 16, 2026

Quick facts

What it is: a tiny natural copper-binding peptide, common in skincare.
Status: a familiar cosmetic ingredient on the skin. Injectable use is for research purposes only and isn't FDA-approved.
Research: promising lab and animal research on skin repair and collagen.
Dosage: there is no established injectable human dose. For skincare, follow the product's directions.
Why it's popular: a skincare favorite for collagen and repair.

What is GHK-Cu?

GHK is a tiny natural peptide made of three amino acids (glycine, histidine, lysine) that binds copper, which gives the name GHK-Cu. It's best known as a skincare ingredient.

Is GHK-Cu FDA-approved?

It's common in skincare products (often listed as "copper tripeptide-1"). U.S. cosmetics and their ingredients don't need FDA premarket approval. GHK-Cu isn't an FDA-approved drug. For injectable use, FDA has cited immunogenicity risk and limited human data (FDA page), and its compounding status is under review.

GHK-Cu dosage: what we actually know

Skincare: GHK-Cu is used in topical cosmetics. Use those as directed on the label.
Injectable: there's no established human dose. FDA has noted limited human data and immunogenicity concerns for injectable use.
Much of the research is in cells and animals, for example a rat ligament model (PMID 25731775) and gene-expression work (PMID 29986520).

Why the numbers online don't agree

Many online "protocols" are converted from animal studies, where doses are set by body weight in rats or mice. Those don't translate directly to people.
The few human reports use different routes and settings, with no agreed standard.
Unregulated products can vary in what they actually contain.
Sellers and influencers often share numbers without sources.

See Why is peptide info so confusing?

Good questions to bring to a clinician

What is actually in the product, and has it been third-party tested?
Is there any human evidence for my specific goal, or only animal studies?
Could it interact with my other medicines or conditions?
Is there an FDA-approved option for what I'm trying to treat?
How would we know if it's working, or causing harm?

What the research shows

Review, 2018 (Int J Mol Sci, PMID 29986520): summarizes lab, animal, and gene-expression research suggesting roles in skin repair and collagen production. The evidence comes mainly from lab and gene-expression data, not large human clinical trials.
Most other recent research is in cells or animals, for example a rat ligament-healing model (J Orthop Res, 2015, PMID 25731775).
We did not find large randomized trials of GHK-Cu in people, injected or applied to the skin.

New to these terms? See the glossary.

GHK-Cu FAQ

Is GHK-Cu safe in skincare?

It's a widely used cosmetic ingredient. U.S. cosmetics don't need FDA premarket approval, so follow product directions and patch-test if you have sensitive skin.

What is the GHK-Cu injection dosage?

There's no established human dose for injectable GHK-Cu, and it isn't FDA-approved for that use.

Does GHK-Cu reverse aging?

Lab and gene-expression studies link it to skin repair and collagen production. Large human anti-aging trials haven't been done yet.

Research purposes only. Not FDA-approved for human use, and products vary in quality. Findings above are from the studies cited.

Not medical advice. Education only. We don't sell anything or tell you what to take. Label doses are there so you can follow along with your prescriber. Talk to a licensed clinician about your health.

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