# Melanotan II

> Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone (alpha-MSH) originally investigated as a sunless tanning agent. It has drawn broader research and off-label interest because melanocortin receptor activation also appears to influence appetite and sexual arousal in some studies. Melanotan II is not approved by the FDA or comparable regulatory bodies for any indication, and formulations sold outside clinical channels vary in purity and concentration. Reported effects and risks are drawn largely from small studies, case reports, and anecdotal use rather than large-scale controlled trials. Because of its broad receptor activity, it is generally regarded as having a less selective profile than newer melanocortin agonists such as bremelanotide.

- URL: https://www.lifeconverted.com/peptides/melanotan-ii
- Primary category: Sexual Health
- Effectiveness rank: #3 in Sexual Health; #6 in Skin & Cosmetic
- Evidence level: Moderate evidence
- Route: Subcutaneous
- Dose range: 250-1,000 mcg
- Dose tiers: low 250 mcg; moderate 500 mcg; high 1000 mcg
- Half-life: Reported as roughly 2 to 4 hours in available pharmacokinetic literature, though pigmentation effects persist well beyond plasma clearance due to sustained melanocyte activation.
- Timing: Evening
- Cycle: Commonly described loading phase of daily dosing for 1 to 3 weeks to establish pigmentation on, Maintenance dosing reduced to 1-2 times weekly, or discontinued once desired pigmentation is reached off (Because Melanotan II is not a regulated pharmaceutical product, dosing patterns reported in user communities are not standardized or clinically validated.)
- Storage: Store lyophilized powder refrigerated at 2-8°C away from light. After reconstitution with bacteriostatic or sterile water, keep refrigerated and use within the timeframe indicated by the supplier, typically a few weeks.

## Mechanism of action

Melanotan II is a non-selective agonist across multiple melanocortin receptor subtypes, including MC1R, which is primarily responsible for its pigmentation effects on melanocytes, and MC3R/MC4R, which are linked to appetite and sexual arousal pathways in the central nervous system. This broad receptor activity is thought to underlie both its tanning effect and its secondary reported effects on libido and appetite suppression.

## Reported benefits

- Studied for stimulating melanogenesis, producing a tanning effect without prolonged UV exposure
- Reported secondary effects on libido in some users and small studies
- May be associated with appetite suppression in early research
- Onset of pigmentation effects reported within days to weeks of regular use

## Reported side effects

- Nausea, particularly with early or higher doses
- Flushing and facial reddening
- Spontaneous or exaggerated skin darkening, including of moles
- Reports of new mole formation or changes in existing moles, which may warrant dermatological evaluation
- Darkening of freckles and increased skin pigmentation unevenness

## Common protocols

- Daily subcutaneous loading phase followed by reduced-frequency maintenance dosing
- Discontinuation once target pigmentation level is reached, with occasional re-dosing to maintain color

## Stacking notes

Reported combination with sexual-health-focused peptides such as PT-141 in some contexts is not well studied; overlapping melanocortin receptor activity may compound side effects such as nausea and flushing.

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