GHK-Cu

The original copper peptide. Your blood carries less of it every decade, and it coordinates repair across thousands of genes.

Evidence: BHuman trials what's this?
Grade B for topical skin use. Injected systemic use is Grade D, extrapolated.
Also known as: Copper Tripeptide-1 · glycyl-L-histidyl-L-lysine copper
Class: Naturally occurring copper-binding tripeptide; tissue-repair signal

The 30-second version

WhatGly-His-Lys bound to copper. It falls from ~200 ng/mL at age 20 to ~80 ng/mL by 60.

Proven forTopical skin firmness, elasticity and collagen in placebo-controlled studies.

The honest catchThe strong evidence is for skin creams. Injection is assumed to work the same way.

What it is

In 1973 Loren Pickart found that something in young people’s blood made old liver tissue behave young again. It turned out to be GHK, a three-amino-acid peptide that binds copper. It circulates in plasma, saliva and urine, rises naturally at sites of injury, and declines by about 60% between 20 and 60. That decline is why it attracts so much longevity interest. It’s a staple cosmetic ingredient and, in the peptide community, an injectable. The solution is naturally blue.

How it works

Copper delivery to the enzymes that build the extracellular matrix.

Build. Fibroblasts make more collagen, elastin, glycosaminoglycans and proteoglycans.

Clear. Balances MMPs and TIMPs, so damaged matrix is removed as well as replaced.

Supply. Raises VEGF for new vessels and recruits repair cells.

Calm. Anti-inflammatory and antioxidant, with gene activity shifted toward a younger pattern.

What the research shows

In people (topical): placebo-controlled studies on ageing, sun-damaged skin reported better firmness, elasticity, clarity and fewer fine lines. In one biopsy study GHK-Cu increased collagen in most treated women, beating vitamin C and retinoic acid creams¹. In animals: across many wound models it sped closure by roughly 20–30%, strengthened healed tissue, improved graft take and grew new vessels¹. In the lab: it stimulates collagen at tiny concentrations and revives radiation-damaged fibroblasts^1,3. Gene-expression work suggests it influences thousands of human genes, many tied to repair².

Excellent evidence on skin. Whether injection matches the cream results is an assumption.

Evidence at a glance

Use	Grade	Best evidence	Main gap	Read
Topical skin rejuvenation	BHuman trials	Firmness, elasticity, collagen up¹	Topical only	Genuinely evidenced
Wound and tissue repair	ELab & animal	20–30% faster closure in animals¹	Animal	Strong preclinical
Collagen and matrix	ELab & animal	Collagen, elastin, GAGs up³	Cell level	Well mapped
Injected systemic benefit	DCommunity use	Assumed from topical and mechanism	No systemic trial	Extrapolated

Dosing: what has been reported

Not a recommendation. These figures describe what was studied or what circulates in practice, kept separate so you can see how solid each one is. Speak with a qualified clinician before acting on any of it.

Setting	Figure	Route	Grade
Published (topical)	Serums around 1–3 ppm and up, daily¹	Skin	B
Community, systemic	~1–2 mg/day in cycles	Subcutaneous	D
Clinic mesotherapy	Low mg per session, weekly to monthly	Intradermal	D

Preparing & storing

Can be stubborn to dissolve. Start with bacteriostatic water and switch to dilute acetic acid if it stays cloudy. A blue or turquoise tint is normal. Refrigerate once mixed and keep it away from strong reducing agents. Don’t apply high-dose vitamin C at the same time, because it destabilises the copper complex.

Reported side effects

Topical: mild irritation or redness in sensitive skin
A harmless blue-green tint on skin or in solution
Injection-site stinging, more with acetic-acid preparations
Occasional headache or flushing with systemic use
Copper load with long-term injection or stacked copper peptides

For long-term systemic use, check serum copper periodically. Standardised photos are the best way to judge skin or hair change.

Who should avoid it

Wilson’s disease or other copper-handling disorders
Copper allergy
Don’t stack copper peptides by injection (GHK-Cu + AHK-Cu)
Pregnancy: topical is low concern, injection unstudied

Regulatory status checked Oct 2026

Body	Status	Detail
FDA (US)	Cosmetic ingredient	Injectable use not approved.
EMA (EU)	Cosmetic ingredient	Not a medicine.
CDSCO (India)	Not approved as drug	—
WADA	Not named	Topical use is no concern; S0 could apply to systemic injection.

The NexGen read

The best-evidenced peptide for skin

GHK-Cu has controlled human data on skin and decades of repair biology behind it. On skin, the evidence is solid. Injected, it is an educated extrapolation, so keep an eye on total copper intake.

References

Pickart L, Vasquez-Soltero JM, Margolina A. GHK peptide as a natural modulator of multiple cellular pathways in skin regeneration. Biomed Res Int. 2015;2015:648108.
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(7):1987.
Maquart FX, Pickart L, Laurent M, et al. Stimulation of collagen synthesis in fibroblast cultures by GHK-Cu. FEBS Lett. 1988;238(2):343–346.