The most researched copper peptide for skin rejuvenation and hair growth.
GHK-Cu is a naturally occurring copper-binding tripeptide (glycyl-L-histidyl-L-lysine bound to copper). It is present in human plasma but declines sharply with age — from your 20s into your 60s — which tracks with the slowdown in skin repair over the same period.
It is one of the most studied cosmetic peptides in existence. GHK-Cu signals the body to remodel and regenerate tissue: stimulating collagen and elastin, acting as an antioxidant and anti-inflammatory, supporting wound healing, and influencing a remarkably broad set of repair-related genes.
Most evidence is in skin and hair, where it is used both topically (creams, serums) and by injection. Topical use has the deepest cosmetic track record; systemic injected use is more experimental.
Boosts collagen and elastin, improving firmness, fine lines and overall skin quality.
Multiple human topical studies show improved skin appearance and collagen
Accelerates wound closure and tissue remodeling.
Well-documented in preclinical and wound-care research
Supports follicle size and hair density, often alongside minoxidil.
Promising early data; common in hair formulations
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Evidence Profile
The best-studied copper peptide. Solid topical/cosmetic human data for skin; injectable and systemic claims are far less proven.
Promising but early. Strong animal data and/or small/preliminary human studies, not yet confirmed in robust trials.
Controlled trials & clinical data in people
Multiple human cosmetic studies support topical skin benefits.
Preclinical results in animal models
Strong animal data for wound healing and tissue remodeling.
How plausibly it works at a biological level
Well-described roles in collagen synthesis, copper transport, and wound signaling.
Depth of documented safety in humans
Topical use well tolerated; injectable copper dosing needs care.
Men focused on skin quality, scalp/hair health and visible anti-aging
Topical is the most proven route; injected use is more experimental — start conservatively. Pairs naturally with a good skincare routine.
Women targeting skin rejuvenation, fine lines and hair density
The best-researched beauty peptide. Topical serums are low-risk; copper can tint solutions blue, which is normal. Avoid injected use in pregnancy.
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Standardized data for GHK-Cu is limited. These are the general effects to watch for with this type of compound.
Rotate sites, use sterile technique, let alcohol dry before injecting.
Hydrate and ease the dose; usually transient as your body adjusts.
Individual responses vary. Stop and consult a clinician for severe, persistent, or unexpected reactions.
6 steps with photos, pro tips, and a dosing calculator.
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View Full GuidePepCompass provides educational information only. Nothing on this platform constitutes medical advice, diagnosis, or treatment. All content is for informational and research purposes only. Always consult a licensed healthcare provider before starting any peptide protocol. Individual results vary.