lookindex

Melanotan II

Also known as MT-2, MT-II, Barbie drug

It does darken skin. Nobody has shown it does so safely, and regulators in the US, UK, EU and Australia all warn against it.

Information only. Not medical advice. Talk to a doctor before you start, stop or change anything.

What people claim

  • Gives a deep tan without the sun
  • Protects against skin cancer
  • Suppresses appetite and raises libido

What the evidence shows

  • The tanning effect is real. A 1996 pilot in 3 men showed skin darkening, alongside nausea and spontaneous erections.[1]
  • A later double-blind study found erections in 17 of 20 men with erectile dysfunction. It was a drug effect, not a tanning benefit.[2]
  • No trial shows it prevents skin cancer. FDA acted against a seller making that claim in 2007.[3]
  • A related drug, afamelanotide, is approved for a rare light sensitivity condition. That approval does not extend to Melanotan II or to cosmetic tanning.[4]

Known risks

  • Moles can darken and change quickly. Melanoma cases have been reported after use, although cause has not been proven.[5][6]
  • Serious case reports include melanoma, a brain swelling syndrome (PRES), a dangerous overstimulation state and priapism.[6]
  • Nausea, flushing and spontaneous erections appear even in small studies.[1]
  • Product strength is unreliable. TGA found bottles with identical labels varied more than twofold.[7]

Reported side effects

Moderated user reports are not open yet, so nothing is shown here. They will be labelled as unverified personal accounts.

Legal status

A summary, not legal advice. Rules change, and sport bans are separate.

United States

Unapproved

No approved product, and not one of the six peptides in the Oct 2026 HHS policy. FDA tells consumers to stop using it.

United Kingdom

Unlicensed

MHRA has warned that no product is licensed and safety is unknown.

Australia

Prescription-only, not approved

TGA says it is prescription-only, is not approved as a tanning agent, and may pose serious health risks.

European Union

Not authorised

Not authorised as a medicine, and Ireland's regulator says it cannot be sold as a cosmetic either.

Sources

  1. 1.Evaluation of melanotan-II in a pilot phase-I clinical studyLife Sciences, 1996
  2. 2.Melanocortin receptor agonists, penile erection and sexual motivationInternational Journal of Impotence Research, 2000
  3. 3.FDA halts sale of injectable tanning productHealthDay
  4. 4.An overview of benefits and risks of chronic melanocortin-1 receptor activationJournal of the European Academy of Dermatology and Venereology, 2025
  5. 5.Warning regarding Melanotan IIThe Skin Cancer Foundation
  6. 6.Bulk drug substances that may present significant safety risksUS FDA
  7. 7.Melanotan II tanning peptide products found to be inconsistently dosedTGA Australia
  8. 8.Melanotan injections are illegal and possibly unsafeCancer Research UK, reporting the MHRA
  9. 9.HPRA alert on Melanotan 2 in self-tanning productsObelis, reporting Ireland's HPRA

Profile last checked 7 Nov 2026.