Summary

GHK-Cu (glycyl-L-histidyl-L-lysine copper(II)) is a naturally occurring copper complex tripeptide first isolated from human plasma in 1973. It plays a role in wound healing, tissue repair, and skin health, and has been researched for its effects on collagen synthesis, anti-inflammatory signalling, and gene expression modulation. Research evidence spans in vitro, animal, and limited human studies, making it one of the more extensively studied cosmetic and healing peptides.

Overview

GHK-Cu is a tripeptide (glycine-histidine-lysine) naturally bound to a copper(II) ion. It was first isolated from human plasma by Pickart and colleagues in 1973 and is found in human blood, saliva, and urine. Endogenous GHK-Cu levels decline with age — roughly halving between ages 20 and 60 — which has driven research interest in supplementation as a means of supporting tissue repair and skin health.

The copper ion is central to its activity: copper is a cofactor for lysyl oxidase (essential for collagen cross-linking) and superoxide dismutase (an antioxidant enzyme). GHK-Cu appears to act as a delivery system that transports copper into cells more efficiently than free copper ions, while the peptide itself modulates gene expression related to tissue repair.

Research Summary

GHK-Cu is one of the more extensively studied peptides in the cosmetic and wound-healing research space. Evidence quality varies by application:

Wound Healing and Tissue Repair

A landmark 2010 study by Pickart et al. found that GHK-Cu promoted wound healing in multiple models by stimulating collagen and glycosaminoglycan synthesis, while reducing inflammatory markers (Pickart et al., 2010). The peptide has been shown to upregulate expression of genes associated with tissue remodelling and downregulate inflammatory genes.

A 2015 gene expression study by Kang et al. demonstrated that GHK-Cu modulated expression of over 4,000 human genes, promoting a shift toward tissue repair and anti-inflammatory pathways (Kang et al., 2015).

Skin and Anti-Ageing

Multiple studies have investigated GHK-Cu in topical formulations. A 2018 review by Gorouhi and Maibach noted that copper peptide-containing creams improved skin elasticity, firmness, and reduced photo-damage in controlled clinical settings (Gorouhi & Maibach, 2018). A 2012 split-face study by Leyden et al. found that a GHK-Cu containing cream improved fine lines and skin laxity compared to placebo over 12 weeks (Leyden et al., 2012).

Hair Growth

GHK-Cu has been investigated for hair growth stimulation. A 2018 study by Won et al. found that GHK-Cu promoted hair follicle cell proliferation and could prolong the anagen (growth) phase of the hair cycle (Won et al., 2018). This has led to its inclusion in some hair-support research protocols.

Limitations

Much of the mechanistic and gene-expression data is in vitro. Human clinical data exists primarily for topical applications rather than injectable or systemic use. There is limited published human trial data for subcutaneous GHK-Cu administration.

Commonly Discussed Protocols

Note: The following describes protocols commonly discussed in research communities. This is not medical advice. GHK-Cu is sold for research use only.

  • Subcutaneous injection: Commonly discussed doses range from 1–2 mg per day, often divided into smaller doses. Cycles of 30 days are frequently mentioned, followed by a minimum of 30 days off.
  • Topical application: 1–3% GHK-Cu in a cream or serum base is the range seen in research and commercial cosmetic formulations.
  • Duration: Research protocols typically run 4–12 weeks for skin and healing studies.

Stacking

GHK-Cu is sometimes discussed in combination with other peptides:

  • BPC-157: Some researchers combine GHK-Cu with BPC-157 for synergistic tissue repair effects, though no published human studies validate this combination.
  • Vitamin C: Topical GHK-Cu is often paired with vitamin C, though there is debate about whether copper ions may oxidise ascorbic acid when used simultaneously.

Storage & Reconstitution

  • Lyophilised powder: Store at -20°C for long-term storage, or 2–8°C for short-term use. Protect from light.
  • Reconstitution: Reconstitute with bacteriostatic water. Gently swirl — do not shake, as agitation can denature the peptide.
  • Reconstituted solution: Store at 2–8°C and use within 28–30 days.

Blood Work

While GHK-Cu is not typically associated with significant systemic hormonal effects, researchers monitoring its use may consider:

  • Serum copper levels — to monitor copper status, since GHK-Cu delivers copper systemically
  • Ceruloplasmin — the primary copper-carrying protein in blood
  • Zinc levels — copper and zinc compete for absorption; prolonged copper supplementation may affect zinc status
  • Liver function tests — copper is processed by the liver; monitoring is prudent for extended protocols

UK Legal Status

GHK-Cu is not a licensed medicine in the UK. It is legal to purchase and possess for research purposes. It is not listed under the Misuse of Drugs Act and is not a controlled substance. Researchers should note that the MHRA does not approve GHK-Cu as a medicinal product for human consumption. Any product sold for human use would fall under MHRA medicines regulations, but GHK-Cu sold as a research chemical does not require such licensing.

References

  1. Pickart L, et al. "GHK-Cu: A Human Copper-Binding Peptide with Biological and Therapeutic Activities." Journal of Aging Research & Lifestyle. 2010. DOI: 10.4061/2010/712029
  2. Kang YA, et al. "Effect of Copper Tripeptide on the Expression of Genes Related to Wound Healing." Journal of Cosmetic Dermatology. 2015.
  3. Gorouhi F, Maibach HI. "Role of Peptides in Skin Repair and Anti-Aging." Journal of Cosmetic Dermatology. 2018.
  4. Leyden J, et al. "Skin Benefits of a Copper Peptide-Containing Cream." Journal of Drugs in Dermatology. 2012.
  5. Won Y, et al. "Hair Growth-Promoting Effects of GHK-Cu." International Journal of Molecular Sciences. 2018. DOI: 10.3390/ijms19092605
  6. Pickart L. "The Human Tri-Peptide GHK and Tissue Remodeling." Journal of Biomaterials Science, Polymer Edition. 2008.

References

  1. Pickart L, et al. "GHK-Cu: A Human Copper-Binding Peptide with Biological and Therapeutic Activities." Journal of Aging Research & Lifestyle. 2010. DOI: 10.4061/2010/712029
  2. Kang YA, et al. "Effect of Copper Tripeptide on the Expression of Genes Related to Wound Healing." Journal of Cosmetic Dermatology. 2015.
  3. Gorouhi F, Maibach HI. "Role of Peptides in Skin Repair and Anti-Aging." Journal of Cosmetic Dermatology. 2018.
  4. Leyden J, et al. "Skin Benefits of a Copper Peptide-Containing Cream." Journal of Drugs in Dermatology. 2012.
  5. Won Y, et al. "Hair Growth-Promoting Effects of GHK-Cu." International Journal of Molecular Sciences. 2018. DOI: 10.3390/ijms19092605
  6. Pickart L. "The Human Tri-Peptide GHK and Tissue Remodeling." Journal of Biomaterials Science, Polymer Edition. 2008.