Skin & cosmetic
Melanotan II
MT-2 · melanocortin · tanning
A tanning peptide with a real, plausible mechanism and a real UK regulatory warning history — one of the more clearly flagged compounds in this library.
Reference status
Editorial research · independent review pending · 3 claims graded
What it is
Melanotan II stimulates melanocortin receptors to increase melanin production, producing a tan without UV exposure. It's chemically related to PT-141/bremelanotide, which is part of why libido effects are also commonly reported.
The tanning mechanism is genuinely plausible and widely reported. What's important to be direct about: UK and other regulators have specifically warned about unlicensed Melanotan products sold online, citing documented adverse effects including nausea, new or changing moles, and reports linked to skin-cancer concern requiring dermatological review.
The science, graded
What’s claimed — and how strong the evidence behind each claim actually is.
“Produces a tan without sun exposure”
Widely and consistently reported, and mechanistically plausible, though not from controlled dermatology trials.
Claim-level citation mapping is in progress.
“Increases libido as a side effect”
Reported due to its relation to PT-141/bremelanotide; not the primary studied use.
Claim-level citation mapping is in progress.
“Safe with no meaningful side effects”
Contradicted by documented regulatory warnings — nausea and skin/mole changes are real, reported concerns.
Claim-level citation mapping is in progress.
Legal and regulatory context
Separate summaries for Great Britain, the United States, and the European Union. These are preliminary research summaries awaiting independent regional review; they are not legal determinations or advice.
Great Britain
Not a licensed medicine or cosmetic product in the UK. Regulators have specifically warned about unlicensed Melanotan products sold online, including safety concerns around skin changes — treat sourcing and use of this compound with real caution.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
United States
Regional legal and regulatory review required before publication.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
- FDA's Concerns About Unapproved Drugs · U.S. Food and Drug Administration
- Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks · U.S. Food and Drug Administration
European Union
Regional legal and regulatory review required before publication.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
- Buying medicines online · European Medicines Agency
What the community says
Widely used and discussed, especially seasonally, but also one of the compounds where forums themselves most consistently repeat safety warnings (new moles, nausea) alongside the tanning enthusiasm.
Where they’re talking
- r/PeptidesMole-monitoring and dosing-nausea advice threads are common.
- Regulatory noticesUK and overseas warnings about unlicensed products are widely referenced.
References
- 1.Supply unlicensed medicinal products (specials) · MHRA
- 2.FDA's Concerns About Unapproved Drugs · U.S. Food and Drug Administration
- 3.Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks · U.S. Food and Drug Administration
- 4.Buying medicines online · European Medicines Agency