GHK-Cu — Experimental Peptide | Supplement Scholar

Overview

GHK is a small tripeptide (glycyl-L-histidyl-L-lysine) that binds copper ions; the complex influences gene expression in skin and connective tissue.

Source

Present in human plasma; declines with age (~200 ng/mL at 20, ~80 ng/mL by 60)

Forms

Topical serum or cream
Subcutaneous injection
Scalp lotion

Mechanism of action

Modulates expression of genes involved in collagen, elastin, and antioxidant production; delivers copper to enzymes that build skin matrix.

Pathways

· Collagen and elastin synthesis
· Antioxidant gene expression
· Hair follicle proliferation
· DNA repair gene upregulation

Enzymes

· Lysyl oxidase (collagen cross-linking)
· Superoxide dismutase

How it acts on the body

GHK is most accurately understood as a 'gene-signaling' peptide. Microarray studies show it modulates more than 4,000 human genes, predominantly resetting them toward a younger expression profile — turning up genes involved in tissue remodeling, antioxidant defense, and DNA repair, and turning down genes involved in chronic inflammation and senescence.

Its copper-binding chemistry is central. Copper is a cofactor for lysyl oxidase (the enzyme that cross-links collagen) and superoxide dismutase (a major antioxidant enzyme). GHK acts as a chaperone that delivers copper to the right enzymes at the right time — a precision delivery system the body itself uses, which it loses with age.

Hormonal & endocrine impact

How this peptide is reported to shift specific hormones and signaling molecules. Directionality reflects research literature and preclinical models, not clinical prescribing data.

Projected hormonal trajectory

Illustrative curves derived from reported direction of effect. Not measured patient data.

Curves are schematic shapes (sigmoid for increases/decreases, damped oscillation for modulation/stabilization) anchored to a 100% baseline. They communicate direction and tempo of change reported in research literature — not absolute hormone concentrations.

Cortisol (skin)Decreases

Downregulates local glucocorticoid-driven gene expression in stressed skin, reducing thinning effects.

TGF-βModulates

Tunes TGF-β signaling to favor regeneration without excess scarring.

DHT (scalp)Decreases

Topical application may inhibit 5α-reductase locally on the scalp, mildly lowering DHT around hair follicles.

Systemic endocrine axesStabilizes

No meaningful systemic hormonal effects when used topically.

Effects on the body

Increases

Collagen and elastin production

Supports

Hair follicle activity

Decreases

Visible signs of photoaging

Organ system effects

Skin

Improves elasticity, fine lines, and post-procedure healing in cosmetic studies.

Immune System

Modulates inflammation in chronic wound models.

Reported effects

Drawn from preclinical research, anecdote, and small-scale clinical observation. No evidence grades are assigned — most peptides on this page lack rigorous human trials.

Improved skin firmness and texture with topical use
May support hair density when applied to the scalp
Faster post-procedure (laser/microneedling) recovery

Potential side effects

Common

· Mild redness at application site

Rare

· Contact sensitivity
· Greenish staining from copper

Serious

· Excess copper exposure if dosed too aggressively

Drug interactions

Retinoids

Combine cautiously — can amplify irritation.

minor

Pairing context

Often combined with

Vitamin C serum
Complementary collagen synthesis support.
Hyaluronic acid
Layering supports hydration and barrier function.

Avoid combining with

Wilson's disease
Copper accumulation is contraindicated.

Important. Research peptides described here are not FDA-approved supplements. Supplement Scholar does not endorse, recommend, or link to any source for purchase. Consult a qualified clinician before considering any peptide therapy.