Compounds studied in skin, wound, and topical research (GHK-Cu, Ac-SDKP, and related peptides) are among the few in this field with published human data, most of it from cosmetic and dermatological trials. This page lists what has been examined, with evidence grades where a Ledger page exists.

Compounds studied in this area:

• GHK-Cu (Copper Peptide) — A naturally occurring tripeptide (glycyl-L-histidyl-L-lysine) bound to copper, first isolated from human plasma in 1973. It’s among the most extensively studied cosmetic peptides in existence — research has documented effects on collagen and elastin synthesis, wound healing, and — more recently — broad epigenetic gene modulation (one 2023 clinical study found GHK-Cu influences activity in roughly 31% of studied human genes). GHK naturally declines with age, which is part of what’s driven sustained research interest in topical replacement.
• PTD-DBM — A peptide developed at Yonsei University that disrupts the interaction between CXXC5 and Disheveled, a negative-feedback brake on the Wnt/β-catenin pathway that drives hair follicle formation. In mouse studies, topical application stimulated visible hair regrowth and even triggered formation of entirely new follicles at wound sites. Preclinical only — evidence is limited to animal models.
• SNAP-8 (Acetyl Octapeptide-3) — A synthetic octapeptide that works like a gentler, topical cousin of Botox: it competes with your body’s own SNAP-25 protein for a spot in the SNARE complex, reducing the neurotransmitter release that drives repeated-expression wrinkles (forehead lines, crow’s feet). An extended, ~30% more active analog of the earlier peptide Argireline. Reversible and non-invasive — a modulation effect, not paralysis.
• Melanotan I — Flagged above: FDA-approved since 2019 as Scenesse (afamelanotide), for erythropoietic protoporphyria. Selectively activates MC1R, driving melanin production with a well-documented Phase 3 evidence base (median 69.4 pain-free sun-exposure hours vs. 40.8 on placebo). Melanotan II — Cross-listed from Sexual Health: same non-selective MC1R/MC3R/MC4R activity drives its tanning effect here, alongside the arousal effect covered on the other page.

What the research generally focuses on

• Collagen and elastin synthesis in dermal fibroblasts
• Wound healing, wound contraction, and tissue remodeling
• Age-related decline in endogenous GHK levels and its downstream effects on skin structure
• Wnt/β-catenin signaling and hair follicle regeneration
• SNARE complex modulation and its relationship to expression-line formation

Before you start

New to this category? Start with our What Are Peptides? overview and Peptide Stability & Handling in Research Settings guide.

This content is provided for research and informational purposes only. Agape Compounds products are not intended for human or animal consumption.