Growth & hormones · ~3 min read
Melanotan I: What It Is, How It Works & What the Research Shows
Overview
Melanotan I (afamelanotide) is a synthetic analog of alpha-MSH that selectively activates the MC1 receptor on skin pigment cells. This increases eumelanin, the dark pigment that protects skin from UV damage. Afamelanotide is approved as a slow-release implant (Scenesse) for erythropoietic protoporphyria, a condition that causes severe pain from light exposure. Compared with Melanotan II, it has a more targeted effect on skin pigment.
Why researchers study it
Tanning & photoprotection
Increases protective dark pigment in the skin.
Light sensitivity
Approved as Scenesse for erythropoietic protoporphyria.
Targeted action
Selective for the skin-pigment receptor (MC1R).
How it works
An alpha-MSH analog associated with MC1R activation and increased eumelanin production. Licensed afamelanotide implant delivery differs from historical injection research.
Adamantane & the blood–brain barrier
Chemically attaching an adamantane group to a peptide can increase its lipid (fat) solubility. Researchers hypothesize that this modification may help certain compounds cross the tightly regulated blood–brain barrier. The effect depends on the specific modified molecule; greater lipid solubility alone does not establish brain delivery or clinical benefit. This does not apply automatically to the unmodified peptide and is not a reconstitution additive.
What the research shows
- Melanocortin signaling and pigmentation are research targets.
- Approved afamelanotide has a specific medical indication; that does not validate MT-1 research powder.
Typical protocol
Reconstitute a 10 mg vial with 3 mL bacteriostatic water for 3.3333 mg/mL. Typical range: 250–1000 mcg 1x daily · daily.
Common stacks
- Melanotan I + PT-141 — Pairs selective skin pigmentation with separate libido support, since MT-I lacks MT-II's arousal effects.
Potential benefits & side effects
Potential benefits
- Deeper, longer-lasting tan with less UV exposure (Melanotan)
- Increased sexual desire and arousal (PT-141, Melanotan II)
- Appetite suppression (Melanotan II)
Side effects
- Nausea (most common)
- Facial flushing
- Darkening of freckles and moles
- Temporary rise in blood pressure (PT-141)
- Spontaneous erections (Melanotan II, PT-141)
Lifestyle factors
- Start low: nausea is dose-related.
- Dose in the evening to sleep through nausea and flushing.
- UV: tanning still requires sun exposure — use sensible exposure and protection.
- Check moles regularly and see a dermatologist for any changes.