GHK-Cu vs GHK

Copper is the difference, and it matters

GHK is a three-amino-acid peptide released from collagen after injury; GHK-Cu is the same tripeptide carrying a copper ion. The copper is not incidental. Delivering it into cells is thought to be a large part of how the molecule works, and GHK readily picks copper up on its own. GHK-Cu is by far the better studied of the two, with controlled topical trials showing improvements in skin density and wrinkle depth. That evidence is for creams on skin, not for injection, which is a distinction worth holding onto.

An anatomical cutaway block of human skin showing epidermis, dermis, subcutaneous tissue, a hair follicle and fine collagen fibres.

GHK-Cu Skin & hair Copper tripeptide-1, Copper peptide Full entry →

Skin dermis extracellular matrix with interwoven collagen and elastin fibres, pale coral and navy microscopy-inspired close-up.

GHK Skin & hair Glycyl-histidyl-lysine, Tripeptide-1 Full entry →

GHK-Cu compared with GHK
	GHK-Cu	GHK
Evidence behind it	Human trials	Animal studies
Worth knowing	The good human evidence is for creams and serums on skin, not for injection.	Most evidence is cell culture and topical; blood levels fall with age but restoring them has not been shown to help.
Approval	Research only	Research only
Category	Skin & hair	Skin & hair
What it is	GHK bound to a copper ion. It is one of the best-studied cosmetic peptides, linked to collagen and elastin production, wound healing, antioxidant effects and hair follicle support. Copper delivery into cells is thought to be part of how it works.	A three-amino-acid peptide found naturally in blood plasma, saliva and urine. Levels fall with age. It is released from collagen after injury and influences many genes involved in tissue remodeling. This is the copper-free form; it readily picks up copper to become GHK-Cu.
How it works	Activates fibroblasts to produce collagen and hyaluronic acid, restoring skin thickness, and shifts expression of a broad set of tissue-remodelling genes.	A tripeptide released from collagen after injury. It shifts the activity of a very large set of genes toward tissue repair, and readily picks up copper, which is how it becomes GHK-Cu.
What studies report	Improved skin firmness, density and wrinkle depth in controlled topical trials Faster wound closure in animal and some human wound studies Thicker hair and more follicles in small topical studies	Shifts the activity of thousands of genes toward tissue repair in human cell studies Wound healing and anti-inflammatory effects in animal models Hair follicle stimulation in cell culture
Dosing	From studies 1–2% in a topical cream, twice daily — Controlled facial skincare trials. Improved skin density, firmness and wrinkle depth Reported, not evidence Topical daily use is the well-evidenced route Injected and microneedled use is off-label and has no trial support	No published dose, and no community figure we would repeat
Why people take it	Skin thickness and collagenWrinkles and skin agingWound healing and scarringHair growthSkin firmness and wrinklesHair thickness	Skin repair and collagenHair growthWound healing
In practice	By far the most mainstream compound here — it is in ordinary retail skincare Applied topically daily in serums for skin texture and firmness Used with microneedling and after cosmetic procedures Scalp application for hair thinning is common	Used topically, though the copper-bound form dominates the market Appears in pre-mixed recovery blends alongside BPC-157 and thymosin-β4
Route	Topical in skincare; injected or microneedled in off-label use	Topical

Rows describing reported use say what people do, not what has been shown to work. Evidence strength is graded the same way across the whole library, so the two columns are directly comparable.

Read the full entries

GHK-Cu → GHK → Open this in the compare tool →

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Educational information only. Nothing here is medical advice, a dosing protocol, or a recommendation to use any compound. Comparing two compounds is not a suggestion to take either one. Talk to a licensed clinician before acting on anything you read here. How to read these entries.