In plain language
Melanotan I, known as afamelanotide, is a melanocortin agonist that increases skin pigment. A controlled-release implant form (Scenesse) is approved for a rare light sensitivity disorder, but the injectable "tanning" peptide sold online is unregulated and not proven safe for that purpose.
What it is explored for
Melanotan I is a genuinely interesting molecule, and in its approved implant form (afamelanotide, Scenesse) it has a real, established role in a rare light-sensitivity disorder. For general cosmetic tanning, however, the injectable products sold online are unregulated and have not been shown to be safe or effective, so that popular use rests on very limited evidence.
- Photoprotection in a rare light-sensitivity disorder (approved implant use)
- Increasing natural skin pigment
- Skin melanocyte (pigment cell) activity
- Of interest for cosmetic tanning (unproven and unregulated)
These are areas of active interest and reported use, not proven outcomes. This peptide carries a preliminary evidence rating, see the evidence summary below for how strong the science actually is.
How it works
Melanotan I is a synthetic analog of alpha-melanocyte-stimulating hormone (alpha-MSH). It primarily affects the cells that produce skin pigment.
- MC1 receptor activation. Activates the MC1 receptor on pigment cells, increasing production of the dark pigment eumelanin.
- Photoprotection. The added pigment is the basis for its approved use in reducing light-triggered skin damage in a rare disease.
- More selective than Melanotan II. It is more selective for pigmentation pathways and has fewer of the broad effects seen with Melanotan II.
The approved use is narrow and uses a specific implant formulation, not the injectable products sold for tanning.
Evidence summary
Evidence supports a specific implant form of afamelanotide for the rare disease erythropoietic protoporphyria, where it is approved. For general cosmetic tanning, the injectable peptide sold online has not been shown to be safe or effective and is unregulated, so that use rests on very limited evidence.
Reported safety & side effects
The approved implant has a defined safety profile within its narrow disease use. Unregulated injectable tanning products are a different matter: purity is uncertain, and side effects such as nausea, flushing, and changes in moles have been reported.
Frequently asked
Is Melanotan I approved?
A specific implant form, afamelanotide (Scenesse), is approved for a rare light-sensitivity disease. The injectable peptide sold online for tanning is not approved for that use.
Is it safe to use for tanning?
That use is not proven safe. Tanning products are typically unregulated, with uncertain purity, and concerns include nausea, flushing, and changes to moles that warrant skin monitoring.