Melanotan II
WellnessAlso known as: Melanotan 2, MT-II, MT2
Emerging ResearchWhat is Melanotan II?
A synthetic analog of alpha-melanocyte-stimulating hormone (α-MSH) originally developed at the University of Arizona. Known for inducing skin tanning without UV exposure, it also has sexual arousal and appetite-suppressing effects. It is not approved by any regulatory agency and carries significant safety concerns.
How it works
Non-selectively activates melanocortin receptors (MC1R through MC5R). MC1R activation stimulates melanocytes to produce melanin (tanning). MC3R/MC4R activation in the brain affects sexual arousal and appetite. This broad receptor activity is responsible for both its effects and its side effect profile.
What marketers claim
- ▸safe sunless tanning
- ▸permanent tan without UV damage
- ▸cures erectile dysfunction
- ▸no serious side effects
What evidence supports
- ✓increases melanin production and skin pigmentation in clinical studies
- ✓produces erections in men with erectile dysfunction in controlled trials
- ✓reduces appetite and food intake in some studies
- ✓the more selective derivative PT-141 (Bremelanotide) was FDA-approved for HSDD
Research evidence
Key studies on Melanotan II, summarized in plain language. This is not an exhaustive list — it highlights the most relevant findings.
Subcutaneous Melanotan II and skin pigmentation in Caucasian subjects
Finding: Melanotan II induced significant skin darkening without UV exposure after 5 days of subcutaneous injection. Tanning was most pronounced in facial and arm skin.
Limitation: Very small sample, short duration, no long-term safety follow-up.
Melanotan II: an investigational drug for erectile dysfunction
Finding: Melanotan II produced erections in 17 of 20 subjects. The erectogenic effect was consistent across organic and psychogenic ED.
Limitation: Small study. Nausea was reported in most subjects. Led to development of the more selective PT-141 rather than further MT-II development.
Best for
What to expect
Realistic timeline based on available research. Individual results vary.
First dose
Nausea and facial flushing are very common within minutes of injection. Some users experience appetite suppression.
Week 1-2
Skin pigmentation begins to deepen, especially with any UV exposure. Freckling and mole darkening may occur.
Week 3-4
Tanning effect becomes more pronounced. Sexual side effects (increased libido, spontaneous erections) are commonly reported.
Month 2+
Pigmentation reaches a plateau. Some users reduce to maintenance dosing. Long-term effects on moles and skin lesions remain a concern.
Safety notes & concerns
Full safety guide →- ⚠not approved by any regulatory agency worldwide
- ⚠non-selective receptor activation causes nausea, facial flushing, and fatigue
- ⚠may darken existing moles and could theoretically promote melanoma in predisposed individuals
- ⚠unregulated supply — contamination and mislabeling are common
- ⚠long-term safety data in humans is essentially absent
- ⚠associated with cases of rhabdomyolysis and renal injury in case reports
Pairs well with
Use caution with
Frequently asked questions
Is Melanotan II safe?
There is no regulatory agency that has approved Melanotan II as safe for human use. Case reports describe serious adverse events including mole changes, cardiovascular events, and kidney injury. The unregulated supply chain adds further risk from contamination. Dermatologists and regulatory bodies broadly advise against its use.
Does Melanotan II protect against sunburn?
While increased melanin provides some UV protection, it is not a substitute for sunscreen. The tanning produced by Melanotan II is primarily cosmetic. Users can and do still burn, and any UV exposure while using the peptide could accelerate pigmentary changes in moles.
How is Melanotan II different from Melanotan I?
Melanotan I (afamelanotide) is more selective for MC1R and was FDA-approved as Scenesse for erythropoietic protoporphyria (EPP). Melanotan II is non-selective, activating multiple melanocortin receptors, which gives it the sexual and appetite effects but also more side effects. Melanotan I is considered significantly safer.
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Last updated: 2025-04-09
Medical Disclaimer
The information on this site is for educational and informational purposes only. It is not intended as medical advice and should not be used to diagnose, treat, or prevent any condition. Always consult with a qualified healthcare professional before starting any new supplement, peptide, or treatment protocol.