GHK-Cu Reference

Plain English

What it is

GHK-Cu is the copper-bound form of GHK, a tiny protein fragment (three amino acids) the body makes on its own. GHK grabs a copper atom to form the complex, also called copper tripeptide-1. It is a common ingredient in skin and hair care products, where it is sold as a cosmetic and not as an approved medicine, and there is no FDA-approved injectable version.

What people use it for

Most people put it on the skin or scalp for firmer skin, collagen, wound-healing, and thicker hair, often alongside other hair products. A smaller group injects it with other peptides as a recovery combination for joints and tendons.

What the science shows

The strongest evidence comes from topical, lab-skin, and animal wound studies, not from solid human trials of the injected form. A topical gel is now in a mid-stage (Phase 2) human trial, with no results yet, and it tests the cream, not injection. Reviews tie GHK-Cu to collagen and skin-repair signals, but the injected form has no strong human trial proof.

The catch

Because it carries copper, it can be risky for people with copper-handling problems such as Wilson's disease or a copper allergy. Most of the real evidence is for creams and topical use, not for injecting it, and the injectable form is not FDA-approved and has no quality checks, so what is in a research vial can vary.

Reference summary

Topical and skin-penetration literature is stronger than injectable human evidence. Published work includes ex vivo human skin permeation studies (Hostynek 2010), animal wound-healing models, and reviews of proposed GHK and GHK-Cu effects authored by the peptide's commercial originator (Loren Pickart / Skin Biology), covering fibroblast activity, dermal matrix remodeling (collagen, elastin, glycosaminoglycans), antioxidant and DNA-repair gene expression, and hair-follicle effects. The registry entry that reads like a Phase 2 topical GHK-Cu wound-healing gel trial (NCT07437586) cannot be counted: its sponsor holds eight entries at a single site, three of which state they are not real trials, and this one states nothing either way. No adequately powered randomized human trial demonstrates that injectable GHK-Cu reproduces those effects systemically.

Regulatory and posture

Categories

Skin/Hair, Recovery

Aliases

Copper tripeptide-1, GHK copper, Glycyl-L-histidyl-L-lysine copper(II), Prezatide copper acetate

Evidence posture

translational - Topical and ex vivo evidence are stronger than injectable human data.

Regulatory status

No FDA-approved injectable GHK-Cu drug label. GHK-Cu is widely sold as a cosmetic ingredient at low concentrations under skincare and haircare claims, where it is regulated as a cosmetic rather than a drug. Most published evidence is topical, transdermal, cosmetic, or animal wound-model research; the injectable preparations sold in research-vial channels are not the same regulatory category as the cosmetic ingredient and carry no FDA quality oversight.

Content review status

research reference

Related tools

• Peptide reconstitution calculator - Convert vial mass and BAC water volume into mcg/ml.
• BAC water calculator - Solve BAC water volume for a target concentration.
• Multi-dose vial calculator - Estimate doses per vial and a projected vial-empty date.
• Reconstituted-vial storage window calculator - Estimate a generic usable-window date and days remaining.
• Peptide half-life calculator - Estimate single-dose decay from cited half-life constants.
• Injection-site rotation overview - Public overview of the Pro site-rotation planner.