GHK-Cu

What it is

GHK-Cu is a tiny naturally occurring piece of protein - three amino acids (glycine, histidine, lysine) - that grabs a copper ion and carries it into tissue. The body makes it naturally, and blood levels fall with age, from roughly 200 ng/mL around age 20 down to about 80 ng/mL by 60, which is part of why it got tied to anti-aging research in the first place. Once copper is delivered, GHK-Cu switches on a large set of genes involved in tissue repair, and it directly prompts fibroblasts (the cells that build skin) to make more collagen, elastin and other structural matrix, while also helping clear out damaged matrix through controlled enzyme activity. That build-and-remodel combination is why it shows up in wound-healing research (faster wound contraction and granulation tissue in animal studies) and in skincare (creams and serums aimed at fine lines and skin density). The strongest, most repeated evidence is topical: cosmetic-science and skin-penetration studies where GHK-Cu is applied to skin and shown to form a copper depot in tissue that lingers well after it clears from blood. Injectable use is a different picture - popular in peptide communities for skin, hair and recovery goals, but that dosing is extrapolated from lab cell-culture data rather than human injection trials, and a 2024 academic review notes FDA flagged compounded injectable GHK-Cu for a safety-risk review. Treat topical and injectable GHK-Cu as two separate evidence pictures under one name.

Dose ranges

Study-backed ranges carry a source you can open. Community ranges are widely reported but not clinically established - treat them as what people do, not as advice.

Reconstitution & storage

Vendor convention, not a manufacturer or clinical standard - no FDA-approved GHK-Cu drug product exists. A common chart uses 2 mL bacteriostatic water across 50/100/200 mg vials (about 25/50/100 mg/mL). Let the vial reach room temperature, direct the water at the inside wall rather than the powder, and swirl gently rather than shaking. Refrigerate immediately after mixing.

Common stacks

Interactions & cautions

No human drug-interaction trials exist for GHK-Cu - what follows is reasoned pharmacology and secondary regulatory reporting, not clinical guidance. Because GHK-Cu's job is delivering bioavailable copper into tissue, combining it with copper-chelation therapy (penicillamine, trientine, or similar drugs used for Wilson's disease or copper overload) is a direct pharmacological conflict - one delivers copper, the other is designed to strip it out - so anyone on chelation therapy or with a diagnosed copper-handling disorder should avoid it and check with their doctor first; this is basic toxicology reasoning, not a documented GHK-Cu-specific interaction study. A 2024 narrative review (Yale Journal of Biology and Medicine) reports that FDA placed GHK-Cu on a list of bulk drug substances flagged for significant safety risk in compounding, citing immunogenicity and impurity concerns specific to the injectable route - note that FDA's compounding bulks lists are revised periodically and a direct fetch of FDA's own list page 404'd for us, so this should be read as the 2024 review's characterization rather than a live regulatory lookup. Topical/cosmetic GHK-Cu has decades of reported use with no adverse effects noted in a 2018 review, though individual skin irritation is always possible with any active cosmetic ingredient. It is not FDA-approved as a drug for any indication or route.

Questions people ask

Sources

1. [1]Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data PMID 29986520reviewDescribes GHK-Cu stimulating collagen, glycosaminoglycan and decorin synthesis and modulating MMP/TIMP activity, reports human plasma GHK falling from about 200 ng/mL at age 20 to 80 ng/mL by age 60, and states decades of cosmetic use show no adverse effects; it does not report a half-life value.
2. [2]GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration PMID 26236730reviewReports GHK-Cu activates TGF-beta and integrin signaling in fibroblasts, stimulates collagen/dermatan sulfate/chondroitin sulfate/decorin at 1-10 nM in fibroblast studies, reduces TNF-alpha-induced IL-6, and penetrates the stratum corneum; states no half-life is reported in the review.
3. [3]Local and Systemic Peptide Therapies for Soft Tissue Regeneration: A Narrative Review PMID 39351323reviewStates topical GHK improved wound contraction and granulation tissue formation in full-thickness rabbit wounds while reducing TNF-alpha, MMP-2 and MMP-9, cites a 0.3 mg/mL GHK-Cu dose used in mouse intra-articular injection studies, and reports GHK-Cu was placed on an FDA list of bulk drug substances flagged for significant compounding safety risk, citing immunogenicity and impurity concerns for the injectable route.
4. [4]Human skin retention and penetration of a copper tripeptide in vitro as function of skin layer towards anti-inflammatory therapy PMID 20703511studyIn vitro human skin diffusion-cell study using a 0.68% aqueous GHK-Cu solution found a permeability coefficient of 2.43x10^-4 cm/h through dermatomed skin, with 136.2 mcg/cm2 of copper permeating and 82 mcg/cm2 retained in tissue as a depot over 48 hours.
5. [5]GHK-Cu Reconstitution: 50mg + 2mL ChartcommunityVendor/community guide reporting common 50/100/200 mg vial sizes reconstituted with 2 mL bacteriostatic water, a swirl-not-shake technique, immediate refrigeration at 2-8C, and about 28 days of stability once mixed.
6. [6]GHK-Cu Dosage Chart: Injectable ProtocolcommunityStates injectable GHK-Cu dosing (roughly 1.7-3 mg/day subcutaneous, commonly 8 weeks on / 8 weeks off) is entirely community-developed and extrapolated from cell-culture bioactivity data, explicitly noting injectable GHK-Cu has no human trials, unlike topical use.
7. [7]Copper Tripeptide-1 (GHK-Cu): The Premier Anti-Aging Ingredient for Skincare FormulatorscommunityIngredient-manufacturer guidance recommending 0.05-0.1% w/w as a typical starting inclusion rate for GHK-Cu in cosmetic formulations, to be stored in cool, dark conditions.
8. [8]GHK-Cu Storage Guide: Temperature, Shelf Life & HandlingcommunityVendor storage guide reporting lyophilized GHK-Cu stability of about 12-18 months refrigerated (2-8C), 18-24 months frozen at -20C, and up to 3 years at -80C; reconstituted solution about 28-30 days refrigerated; and that UV light and the copper ion's photochemical sensitivity require dark or amber-vial storage.
9. [9]GHK-Cu: Copper Content, Half-Life & Skin Repair ResearchcommunityCommunity pharmacokinetics reference listing an approximate 105-minute plasma half-life without attributing it to a specific study, alongside a note that topical application produces prolonged tissue retention versus plasma clearance.