Nonapeptide-1 is a synthetic nine-amino-acid peptide used as a cosmetic ingredient and described as an antagonist of the melanocortin 1 receptor (MC1R). Independent peer-reviewed research on the ingredient itself is very limited.
Established: alpha-MSH binds MC1R on melanocytes, raising cAMP and activating PKA, CREB and MITF, which increases tyrosinase and melanin synthesis [1][3]. Proposed: nonapeptide-1 competes with alpha-MSH at MC1R and so dampens this signal; this rests mainly on supplier data and MC1R peptide-screening research [2], not on independent compound-specific studies.
| Study | Model | Reported result | Source |
|---|---|---|---|
| Alpha-MSH and melanocyte function [1] | Review Review of alpha-MSH/MC1R biology | Describes alpha-MSH regulation of melanocyte pigmentation via MC1R; background for MC1R-targeting peptides. | Peer-reviewed Ann N Y Acad Sci 1999 |
| MC1R antagonist and agonist peptides [2] | Cell Peptide screening against human MC1R | Researchers isolated and characterized peptides acting as antagonists or agonists at human MC1R. | Peer-reviewed Peptides 2005 |
| Peptides inhibiting melanin synthesis [3] | Review Review of melanogenesis-inhibiting peptides | Outlines the MC1R-cAMP-MITF-tyrosinase pathway targeted by cosmetic peptides; does not test nonapeptide-1 directly. | Peer-reviewed Front Pharmacol 2025 |
Human cosmetic studies describe appearance only. Lab results do not establish effects on skin structure.
