What Is GHK-Cu? Uses, Risks, and FDA Status
What Is GHK-Cu?
GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring copper peptide found in human plasma, saliva, and urine. First identified in 1973 by Dr. Loren Pickart, it consists of three amino acids bound to a copper ion. GHK-Cu levels decline significantly with age — plasma concentrations at age 60 are roughly one-third of levels at age 20 — which has driven interest in its potential as an anti-aging and regenerative compound.
How Does GHK-Cu Work?
GHK-Cu works through multiple mechanisms related to tissue remodeling and repair. It stimulates collagen and glycosaminoglycan synthesis, which are essential for skin structure and wound healing. It promotes the production of decorin, a proteoglycan involved in tissue organization. Research suggests GHK-Cu also has antioxidant properties, reducing oxidative damage by modulating iron and copper levels in tissue. Gene expression studies indicate it can reset the activity of approximately 4,000 human genes toward a healthier expression pattern (Pickart et al., BioMed Res Int, 2012). The copper ion itself plays a role in enzymatic processes critical to connective tissue formation.
What Is GHK-Cu Used For?
Based on published research, GHK-Cu has been investigated for:
- Skin rejuvenation — Stimulates collagen synthesis, improves skin elasticity, and reduces fine lines; widely used in topical skincare formulations
- Wound healing — Accelerates wound closure and reduces scarring in animal and human studies (Leyden et al., J Cosmet Dermatol, 2002)
- Hair growth — Research suggests it may stimulate hair follicle growth and increase hair follicle size
- Anti-inflammatory effects — Reduces inflammatory markers in tissue, including TNF-alpha and IL-6
- Tissue remodeling — Promotes the breakdown of damaged extracellular matrix and replacement with healthy tissue
- Lung tissue repair — Preliminary research on fibrotic lung tissue remodeling
What Are the Risks?
- Generally well-tolerated topically. GHK-Cu has a long history of use in skincare products with a favorable safety profile.
- Injection site reactions. When administered subcutaneously, localized irritation, redness, or discomfort may occur.
- Copper sensitivity. Individuals with Wilson's disease or copper metabolism disorders should avoid GHK-Cu.
- Limited injectable safety data. While topical use is well-studied, injectable GHK-Cu has less published safety data in humans.
- Potential interactions. Copper peptides may theoretically interact with other copper-containing supplements or medications.
FDA Status
GHK-Cu is available in multiple forms. As a topical cosmetic ingredient, it is widely available without restriction in skincare products. As an injectable peptide, it was reclassified to Category 1 in February 2026 and is available through licensed compounding pharmacies with a physician prescription. It is not FDA-approved as a drug in any form. Its dual availability — over-the-counter topical and prescription injectable — makes it somewhat unique among peptides.
Key Takeaway
GHK-Cu is a naturally occurring copper peptide with strong evidence for skin rejuvenation and wound healing, available both as a topical cosmetic ingredient and as an injectable through compounding pharmacies.
This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any peptide therapy.