Melanotan II

What is Melanotan II?

Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone (α-MSH) that stimulates the skin's pigment cells to produce more melanin, darkening the skin. It is sold online and through gray-market channels as an injectable "tanning" peptide, typically self-administered without medical supervision.

It is not an approved medicine. Melanotan II has never been through the clinical development and approval process required of a drug, and it is illegal to sell for human use in many countries. It should not be confused with afamelanotide (SCENESSE), a related but FDA-approved melanocortin implant used only for a rare inherited disorder — nor with PT-141 (bremelanotide), a Melanotan II metabolite developed as an approved treatment for low sexual desire.

How Melanotan II works

Melanin is the skin's natural pigment and its built-in defense against UV damage. Melanotan II is a non-selective agonist at melanocortin receptors: activating the melanocortin-1 receptor (MC1R) on melanocytes drives them to produce more eumelanin, which darkens the skin even with limited sun exposure [1].

Because it also activates other melanocortin receptors — including MC3R and MC4R in the brain — its effects extend well beyond pigmentation. That off-target activity explains why appetite, sexual arousal, and blood pressure can all be affected, and it is the same MC4R action that PT-141 was later developed to exploit deliberately. Critically, a peptide-induced tan does not make UV exposure safe.

What Melanotan II is used for

What the evidence shows

There is no body of large, controlled clinical trials establishing Melanotan II as a safe or effective cosmetic product — it was never developed as an approved drug. What exists instead is a substantial dermatology literature documenting harms in people who use it.

Case reports and case series have described new, changing, and atypical melanocytic naevi (moles) in Melanotan II users, and melanoma diagnosed in the setting of its use [3]. National regulators including the U.S. FDA and the UK's MHRA have issued public warnings against these products.

The one melanocortin peptide with regulatory approval, afamelanotide, is approved only to increase pain-free light exposure in adults with erythropoietic protoporphyria — a narrow, specialist indication that says nothing about the safety of self-injected Melanotan II for a tan [2].

Dosing & administration context

Because Melanotan II is unapproved and unregulated, there is no legitimate medical dosing standard for cosmetic use, and Strong Health does not provide one. Products bought online carry no assurance of identity, purity, sterility, or dose, and are usually self-injected — compounding the risk.

This section is deliberately not a how-to. Our position is that there is no version of self-injected Melanotan II we can stand behind, and we would rather help you protect your skin than tan it pharmacologically.

Melanotan II is not an approved drug. It is unregulated, illegal to sell for human use in many countries, and not provided by Strong Health. This page is educational and is not medical advice or a dosing guide.

Safety & side effects

The most serious concern is the skin itself: reports of new and atypical moles, and of melanoma, in Melanotan II users. Anyone who has used it and notices a new, changing, darkening, or asymmetric mole should see a dermatologist promptly [3].

Systemic side effects are also commonly reported, including nausea, facial flushing, spontaneous erections, appetite changes, and shifts in blood pressure — a direct consequence of the peptide's action on melanocortin receptors beyond the skin. And because a Melanotan tan offers no dependable UV protection, it may encourage more sun or sunbed exposure, adding to skin-cancer risk rather than reducing it.

Why Strong Health does not offer Melanotan II

Strong Health does not prescribe, compound, or supply Melanotan II, and we would not recommend it. We built our practice on physician supervision, pharmacy-grade sourcing, and honest evidence — and an unregulated, self-injected tanning peptide with melanoma case reports fails that standard on every count.

If your underlying interest is skin health and appearance, we are glad to help with approaches that have real support. See our guide to peptides for skin and anti-aging, explore the physician-reviewed molecule library, and — most importantly — treat daily sun protection and prompt dermatology review of any changing mole as the foundation of skin safety.

Frequently asked questions