Nonapeptide-1Cosmetic ingredient
Nonapeptide-1 is a synthetic peptide used in cosmetics aimed at uneven skin tone. It is often associated with the Melanostatine name and a proposed effect on pigment signalling.
What is Nonapeptide-1?
Nonapeptide-1 is a synthetic cosmetic peptide associated with the Melanostatine name. It is used in products aimed at uneven skin tone.
How it works
It is promoted as interfering with part of the alpha-melanocyte-stimulating-hormone pathway involved in pigment production. This is a proposed pigment-reducing mechanism, unlike the pigment-stimulating aim of melanotan products.
Effects studied
Uneven pigmentation
The retained source is a review of cosmetic peptides. It gives mechanistic context but does not establish how much a specific serum improves a defined pigmentation condition compared with its base formula. 1
Evidence: Review-level background; no direct product effect estimate established here.
What does the evidence show?
The retained review provides context on cosmetic peptides. Independent clinical results for a defined formulation and pigmentation condition would be needed for a stronger treatment claim.
The proposed pigment pathway
Alpha-melanocyte-stimulating hormone helps regulate pigment production through melanocortin signalling. Nonapeptide-1 is promoted as interfering with part of that pathway. Melanotan products, by comparison, aim to stimulate pigmentation. Despite the similar terminology, the claimed effects run in opposite directions.
Uneven tone has more than one explanation
Marks after inflammation, melasma, freckles and sun-related pigmentation are not interchangeable. Even if a formula changes one kind of pigmentation, the result may not apply to another. The duration, skin type and surrounding skincare routine also affect how a study should be interpreted.
A review is not a direct product trial
A review of mechanisms or ingredient uses can suggest research questions, but cannot establish how much a particular serum changes pigmentation compared with its base formula. The retained review provides background; it does not support a numerical promise of lighter or more even skin. 1
What belongs beside an appearance claim
Irritation can complicate pigmentation concerns, so tolerability matters as well as visible change. A cosmetic should not be used to explain away a new or changing lesion. Nor does a pigment-targeting ingredient replace protection from ultraviolet exposure, which remains relevant to many uneven-tone concerns.
Safety & status
Irritation can complicate pigmentation concerns. A new or changing lesion needs its own assessment, and pigment-targeting cosmetics do not replace ultraviolet protection.
Country and product status
This page describes a cosmetic ingredient and its research context. Permitted claims and product availability in Germany and Switzerland need a local check. An ingredient listing does not establish approval to treat a medical condition.
Frequently asked questions
Does evidence for one type of pigmentation apply to all dark patches?
No. Melasma, freckles and marks after inflammation have different contexts and should be studied separately.
Is nonapeptide-1 another name for Melanotan I?
No. Similar terminology hides different molecules and different intended effects on pigmentation.
Further reading
Sources
This entry was rewritten from our research archive. References below are reading leads unless a completed check is explicitly noted; a full independent evidence and regulatory review is still pending.
- Nonapeptide-1: paper 10.5114/ada.2022.115890 Research reference · Retained archive reference; not independently checked for this draft.
Research provenance
This name was discovered in the Superpower peptide index, archived 26 October 2026. Its ratings and reviewer attribution have not been adopted as our own. The archive informed this original editorial draft; independent source review is still pending.