Melanotan 2: What Is Known and Still Unknown
A tanning drug led to a few small studies. The possible harms now matter as much as the early findings.
Who made the compound, and what followed?
An Arizona research team developed Melanotan 2 in the late 1980s. The aim was a tan with less sunlight and perhaps a lower skin cancer risk. A tiny test in men found that skin grew darker after several shots. Erections that nobody had planned also occurred in those same men.
Later animal studies pointed to less hunger and changes in the brain's response to food. People then told doctors about nausea, flushing, and moles that appeared or grew darker. A few medical reports describe grave harm among its users. What matters for you now is that not one country has approved this compound for tanning or medical care.
How can Melanotan 2 affect more than skin?
Melanotan 2, also called Melanotan II or MT-2, is a short ring made from protein parts. It mimics a natural hormone, a body message that starts brown pigment in the skin. Your brain and skin can each react to this copied message [1]. A shot may therefore reach far beyond a tan.
Skin cells react by adding brown pigment [2]. Brain effects may include a smaller appetite or an erection [3]. This is why researchers moved from a tanning test to an erection study. It also shows you why unwanted effects may differ so much.
You have only two small studies in people. Rats and mice supplied most other findings, while doctors wrote reports about single people who were harmed. No large trial has settled the long-term risks. No health authority has yet approved human use of the compound [1].
What did the small human studies find?
Three healthy men entered the first Melanotan 2 study. Five small shots beneath the skin left 2 of 3 men darker without sun. The erections ran from 1 to 5 hours; the men also felt mild nausea [4]. These are study facts, not directions for you.
A second study gave 10 men either Melanotan 2 or a placebo, which is a comparison shot with nothing active. In this brief study, eight of the 10 men had clear erections that stayed firm for 38 minutes on average, against 3 minutes with placebo [5]. In mice, Melanotan 2 reduced eating and the effort made to obtain food [6]. That animal result tells you nothing certain about people.
Which warning signs matter for you?
Doctors have reported new or darker moles after Melanotan 2 use. Some reports describe moles unlike the person's other moles after use. A few people using Melanotan 2 later received a melanoma diagnosis, which means skin cancer [7]. Other Melanotan 2 reports describe muscles breaking down, kidney damage, a painful erection that stayed up, and brain swelling [8].
An online Melanotan 2 vial adds another worry. Tests found false labels and matter that was not supposed to be in some products [9]. The label can't tell you the real strength or whether the vial is clean. The Melanotan 2 effects page explains which signs need a doctor.