Longevity & cellularInjectable

GHK-Cu

Also known as: Copper tripeptide-1 · GHK-copper

GHK-Cu is a naturally occurring copper-binding peptide (glycyl-L-histidyl-L-lysine bound to copper) studied for skin, hair and tissue renewal.

Physician-reviewedDr. Bushra Mir, Medical Director · DHA-licensedReviewed 10 July 2026

The molecule, up close

Class: Copper-binding tripeptide
Origin: Occurs naturally in human plasma; declines with age
Chemistry: Glycyl-L-histidyl-L-lysine complexed with copper(II)
Typical format: Topical (cosmetic); injectable (clinical)
Regulatory status: Established skincare ingredient; injected use still under study

This page is educational information, not medical advice or an offer of treatment. Peptides used clinically are prescription medicines; whether any is appropriate for you is a decision a physician makes after a diagnostic assessment.

What it is

GHK is a small peptide that occurs naturally in the body and binds copper to form GHK-Cu. Its levels in plasma fall as we age, which is part of why it became a subject of interest in skin and tissue biology — the idea that restoring a youthful signal might support renewal.

It's unusual among these peptides in having a genuine, decades-long presence in cosmetic science: GHK-Cu is a well-known skincare ingredient. That gives it more real-world data than most compounds here, at least for topical use.

What it's studied for

Interest spans skin quality and repair, hair and scalp signalling, wound healing and collagen-related pathways. It's one of the most-studied peptides for skin renewal specifically.

The distinction that matters is route: topical cosmetic use is comparatively well explored, whereas systemic, injected use is a separate and much earlier area of study.

The science

Research associates GHK-Cu with genes and pathways involved in tissue remodelling, antioxidant activity and collagen production — the signalling the skin uses to renew itself — and with copper's role in several repair-related enzymes.

As with these compounds generally, the systemic picture in people is less settled than the topical, skin-level one, and is best read accordingly.

Typical form

Injectable

Shown in the dispensing format most often used in research and clinical settings. Where any protocol is appropriate, the route, dose and schedule are a physician’s decision — not a fixed recipe.

Safety & considerations

As a topical cosmetic ingredient it's widely used and generally well tolerated. Clinical, injected use is a different setting that's prescription-only and physician-supervised.

Because it involves copper, individual suitability and copper balance matter, so assessment and monitoring are a doctor's responsibility for any clinical use.

Status & oversight

GHK-Cu is an established cosmetic skincare ingredient. Clinical injected use is still under study and medically directed — the two contexts are best not conflated.

Common questions

GHK-Cu, in brief.

What is GHK-Cu used for?

It's studied for skin quality, hair and tissue renewal. As a topical skincare ingredient it's well established; clinical injected use is earlier and physician-directed.

Is GHK-Cu safe for skin?

As a cosmetic ingredient it's widely used and generally well tolerated. Clinical, injected use is a different setting that requires physician assessment, including of copper balance.

Does GHK-Cu help hair?

It's studied for hair and scalp signalling and appears in some hair products, though the clinical evidence for injected use is earlier. Hair loss has many causes that are worth diagnosing first.

Is GHK-Cu the same as copper peptides in skincare?

Yes — "copper peptide" in skincare usually refers to GHK-Cu. That topical, cosmetic use is well established and distinct from clinical injected use.

Peptides of this kind are prescription medicines. Whether any protocol is appropriate is decided the way the rest of the practice works — from data, after an assessment.

How our longevity assessment works Back to the peptide field guide

How this is written

Physician-reviewed and evidence-led. We describe what a compound is studied for and where the evidence stands — not what it will do for you — and we revise pages as the science changes. Reviewed by Dr. Bushra Mir, Medical Director · DHA-licensed.

References

Peer-reviewed references for this compound are added by the physician author before publication.