Melanocortin agonist that stimulates tanning and can increase libido; used in low, careful doses.
Melanotan II is a synthetic analogue of alpha-MSH that activates melanocortin receptors broadly. Its best-known effect is stimulating melanin production for a deep tan with far less UV exposure, but because it hits multiple melanocortin receptors it also raises libido and suppresses appetite.
That broad activity is both its appeal and its problem. The same receptor promiscuity that tans the skin causes the classic side effects: nausea (especially early), facial flushing, spontaneous erections in men, and darkening of existing moles and freckles.
It is unregulated and widely counterfeited, and the mole-darkening effect is a genuine safety consideration. Sensible use means very low starting doses and getting moles checked first.
Stimulates melanin for a tan with reduced UV exposure.
Reliable, well-reported tanning effect
Raises sexual desire via central melanocortin pathways (related to PT-141).
Consistent anecdotal and mechanistic support
Often reduces appetite as a side effect.
Commonly reported; not its primary purpose
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Mostly preclinical (animal/in-vitro) evidence with a clear mechanism. Human effects are largely anecdotal.
Men wanting a tan (and often the libido side effect), comfortable managing the risks
Start with very low doses to limit nausea. Have moles checked first and monitor them. Expect flushing and possible spontaneous erections.
Women seeking tanning at low doses
Effective at low doses; nausea is common when starting. Mole/freckle darkening is a real concern — get a skin check first. Avoid in pregnancy.
Effective tanning at low doses; nausea common when starting. Avoid in pregnancy.
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Have all moles checked by a dermatologist first — can darken existing moles and freckles.
Discontinue if any mole changes shape, size, or color.
Common effects: nausea, facial flushing, spontaneous erections, appetite loss.
Start with very low doses to assess tolerance.
The effects most commonly reported with Melanotan II, when they tend to show up, and how to manage them.
Start with very low doses; dose before bed to sleep through it.
Expected; ensure you still eat adequately.
Have moles checked first; stop if any mole changes shape/size/color.
A known MC4R effect; reduce dose if disruptive.
Individual responses vary. Stop and consult a clinician for severe, persistent, or unexpected reactions.
14 steps with photos, pro tips, and a dosing calculator.
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