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Cosmetic & Dermal — Category Hub

Peptides studied in dermatological and cosmetic research — GHK-Cu, AHK-Cu, Matrixyl, Argireline, SNAP-8, and the melanocortin analogs Melanotan I and II.

For research and educational purposes only. This page is not medical advice. No dosing or human-use instructions are provided.

What this category covers

Cosmetic and dermal research peptides fall into three fairly distinct mechanistic groups, and conflating them is the most common source of confusion in this category.

Copper-binding tripeptides — GHK-Cu and AHK-Cu — carry a copper(II) ion and are studied in the context of extracellular-matrix remodelling, collagen and glycosaminoglycan synthesis, and follicular research. Their activity is inseparable from the bound copper; the apo-peptide is a different subject of study.

Cosmetic signal peptides — Matrixyl (palmitoyl pentapeptide), Argireline (acetyl hexapeptide) and SNAP-8 — are studied almost exclusively in topical formulation research. Argireline and SNAP-8 are SNARE-complex-targeting sequences investigated for their effect on neurotransmitter vesicle docking, a mechanistically different question from Matrixyl's matrix-signalling research.

Melanocortin receptor agonists — Melanotan I (afamelanotide) and Melanotan II — are α-MSH analogs studied in melanogenesis research. Melanotan I is the more receptor-selective earlier-generation compound; Melanotan II is a shorter cyclic analog with broader melanocortin-receptor activity, which is why the two appear in different research literatures despite the shared name.

Entries in this category

Every entry in this category in the PeptiDex library, with its compound class and a one-line research summary. Follow any entry for the full research overview, mechanism, reported research dosing, and studied effects.

GHK-CuCopper-binding tripeptide — A copper-binding tripeptide studied in dermal-research and tissue-remodeling contexts.Melanotan IIMelanocortin receptor agonist — A synthetic analog of α-MSH studied in melanogenesis research.SNAP-8Cosmetic signal peptide — An octapeptide studied in cosmetic-research and topical formulation contexts.MatrixylCosmetic signal peptide — A palmitoyl pentapeptide studied in collagen-research and topical applications.ArgirelineCosmetic signal peptide — A hexapeptide studied in cosmetic muscle-relaxation research.AHK-CuCopper-binding tripeptide — A copper-binding tripeptide studied alongside GHK-Cu in dermal and follicular research contexts.Melanotan IMelanocortin receptor agonist — A synthetic analog of α-MSH studied in melanogenesis research, the earlier-generation counterpart to Melanotan II.GLOW Blend (BPC-157 + TB-500 + GHK-Cu)Multi-component research blend — A research-supplier blend combining BPC-157, TB-500, and GHK-Cu, three peptides referenced in dermal and tissue-repair research contexts.

Topical versus systemic research contexts

The signal peptides in this category (Matrixyl, Argireline, SNAP-8) are studied in topical formulations, where penetration through the stratum corneum is itself a research variable — molecular weight and lipophilicity largely determine whether a sequence is a plausible topical candidate. The copper tripeptides appear in both topical and injected research contexts. The melanocortin analogs appear in systemic contexts only. Reading a study without noting which context applies is the fastest way to draw a wrong conclusion here.

See also

  • Tissue Repair hub — GHK-Cu also appears in repair research alongside BPC-157 and TB-500.
  • GLOW Blend — a supplier blend of BPC-157, TB-500 and GHK-Cu spanning both categories.
  • Glossary — extracellular matrix, glycosaminoglycan, and the rest of the vocabulary used above.

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