Peptides
GHK-Cu
What is it?
GHK-Cu is a short peptide bound to copper. It is found naturally in the body and appears in topical skin-care products. Topical cosmetics and injected peptides are different products with different evidence and risks. [1,3]
How might it work?
Laboratory and animal studies suggest GHK-Cu may influence collagen production and signals involved in skin remodeling and repair. That is a reason to test a finished topical formula in people, rather than assuming every serum or injection will have the same effect. [1]
Why is it used for skin and repair?
Small human topical studies have reported improvements in skin appearance, but formulations and methods vary. In a randomized study after laser resurfacing, 13 people completed 12 weeks of care. Objective assessments found no clear advantage for the GHK-Cu regimen in wrinkles or overall skin quality, while patient satisfaction favored it. This suggests possible cosmetic value, with the size and reliability of any effect still uncertain. [1,2]
Evidence for injected GHK-Cu helping tendons, hair, or whole-body recovery is much thinner than the topical skin evidence. [1,3]
What should you know before considering it?
The FDA flags injectable GHK-Cu for potential immune reactions from aggregation or impurities and notes limited human safety information. Topical use should not be treated as proof of injection safety. [3]
TOPICAL PRACTICE
How much?
FORM & SCHEDULE
What it refers to
GHK-Cu topical product once daily
This does not apply to injections. FDA notes limited human injection-safety data and possible immune reactions.
0.5–1% — topical GHK-Cu once daily is a practical starting range described by peptide educator Jay Campbell for skin or scalp. It is a product-use convention, not a concentration proven best in head-to-head trials. [4]
Read detailed dosing notes
Use a clearly labeled topical product according to its directions; concentration alone does not guarantee delivery through skin. This amount does not apply to injection. [1,3]
Sources & further reading
- Oregon State University Linus Pauling Institute. Peptides and skin health (opens in a new tab)lpi.oregonstate.edu
- Miller et al. (2006). Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin (opens in a new tab)pubmed.ncbi.nlm.nih.gov
- FDA. Certain bulk drug substances that may present significant safety risks (opens in a new tab)www.fda.gov
- Jay Campbell (2026). GHK-Cu dosage for hair growth and skin rejuvenation (opens in a new tab)jaycampbell.com