Use case

Skin and hair

Which peptides have the strongest evidence for skin or hair claims?

Context

Skin and hair claims depend on route, formulation, indication, and study design.

Compare topical GHK-Cu, KPV, and related skin or hair claims by route, formulation, and evidence strength.

Peptides compared

Moderate human evidence

GHK-Cu

A copper-binding tripeptide with route-specific topical skin and wound evidence, plus much weaker systemic, hair, blend, and injectable claim areas.

Varies by product and jurisdiction

Mostly preclinical

KPV

A short alpha-MSH-derived peptide motif with preclinical gut-inflammation, delivery, and antimicrobial literature, but no direct human KPV efficacy evidence found.

Investigational / not approved

Sources

1.
PubMed. Enhanced healing of ulcers in patients with diabetes by topical treatment with glycyl-l-histidyl-l-lysine copper 1994.
PMID:17147644 Accessed 2026-06-08.
Topical diabetic-ulcer source; not evidence for injectable or systemic claims.
2.
PubMed. Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin 2006.
PMID:16847171 Accessed 2026-06-08.
Topical post-laser skin source; formulation and indication matter.
3.
PubMed. Physicochemical characterization of native glycyl-l-histidyl-l-lysine tripeptide for wound healing and anti-aging: a preformulation study for dermal delivery 2016.
PMID:25384620 Accessed 2026-06-08.
Dermal-delivery formulation context; not systemic efficacy evidence.
4.
FDA. Is It a Cosmetic, a Drug, or Both? (Or Is It Soap?) 2026.
Accessed 2026-06-08.
FDA consumer product boundary source; product claims can change regulatory posture.
5.
PubMed. Antimicrobial effects of alpha-MSH peptides 2000.
PMID:10670585 Accessed 2026-06-08.
Alpha-MSH peptide antimicrobial context including KPV-related sequence discussion.