Copper Peptides (GHK-Cu): The Complete Guide
Copper peptides — the flagship being GHK-Cu (glycyl-L-histidyl-L-lysine + copper) — are one of the best-studied cosmeceutical peptides in the world, with more than 40 years of research covering skin remodeling, hair regrowth, wound repair, and anti-inflammatory activity.
What copper peptides do
GHK-Cu signals fibroblasts to rebuild collagen I, III, and elastin. It normalizes the expression of thousands of skin-related genes toward a younger phenotype (Pickart et al., 2015).
- Increased collagen and elastin synthesis
- Improved skin firmness and reduced wrinkle depth
- Wound closure acceleration in diabetic and chronic wounds
- Hair follicle enlargement and reduced shedding
- Powerful antioxidant + anti-inflammatory signaling
- Reset of aging fibroblast gene expression toward youthful pattern
Topical vs. injectable copper peptides
Topical GHK-Cu (0.05–3% serum) is the safest and most-studied route for skin and hair. Subcutaneous injection is used off-label for systemic anti-aging and wound work at 1–2 mg per dose, 3–5x per week. Injection concentrates the signal but requires research-grade sourcing and sterile technique.
Copper peptide dosing (topical)
A 2% GHK-Cu serum applied once nightly to clean skin is the sweet spot in the literature. Results typically show at 6–8 weeks (fine lines, firmness) and 12+ weeks (deeper wrinkle and pigment improvements).
Copper peptide dosing (injectable, research-use only)
1–2 mg SC per dose, 3× per week, cycled 8 weeks on / 4 weeks off. A standard 50 mg vial + 5 mL bac water = 10 mg/mL → 10 units on U-100 = 1 mg. Rotate injection sites to prevent local pigmentation.
Frequently asked questions
What are copper peptides used for?
Skin remodeling (collagen + elastin), wound healing, hair regrowth, and anti-inflammatory signaling. GHK-Cu is the most-studied member of the family.
How much GHK-Cu should I inject?
Research protocols use 1–2 mg SC, 3× per week, cycled. Topical 2% serum is the safer everyday option.
Is GHK-Cu FDA approved?
GHK-Cu is not FDA-approved as a drug. Topical GHK-Cu is sold globally as a cosmetic ingredient. Injectable use in the U.S. is research-only.
How long until copper peptides show results?
6–8 weeks for topical firmness and fine lines; 12+ weeks for deeper wrinkle, pigment, and hair changes.
Keep researching
- Full GHK-Cu profile →
- AHK-Cu (hair-focused copper peptide) →
- Peptides after menopause →
- Shop research peptides →
Protocol oversight provided by Kindr Health Inc. (NPI: 1609792902). Peptides sold through the Kindr research shop are for laboratory research use only and are not intended to diagnose, treat, cure, or prevent any disease.