Skin color, hunger, and risk
Melanotan 2 can darken skin and change hunger or sex drive
Small tests found changes in skin, hunger, and sex. See what those findings mean for your body and why your risk is still unknown.
What may happen before the tan
You may first hear about a quick tan. Melanotan 2 is made in a lab. It copies a hormone that tells skin cells to darken. Small human tests found darker skin without added sun. The men also felt less hungry and had erections. The hormone affects the brain as well as the skin.
Melanotan 2 has never been approved as medicine.
Two related drugs were tested more fully. Afamelanotide treats a rare illness that makes sunlight hurt. Bremelanotide treats low sex drive in some women. Each is approved for that one use. Melanotan 2 isn't. Illegal sites now sell it as a tanning shot.
People also report nausea and much darker moles. Doctors have described skin cancer, kidney harm, muscle damage, brain swelling, and erections that don't end. These effects and risks can need urgent care. Think of the compound as one key opening several locks. You can't choose only the tan. If you've used it, tell your doctor about changes in your skin, hunger, or sex drive.
What Melanotan 2 changed in small tests
Melanotan 2 copies a hormone your body already makes. In skin, that hormone tells cells to add dark color. In the brain, it can affect hunger and sex. The compound acts on five kinds of cells that respond to the hormone [1]. Those cells help control skin color, hunger, energy, sex, and gland activity. Victor Hruby and Mac Hadley made the compound at the University of Arizona. They made it stronger than the hormone and harder for your body to break down [1].
The first test involved three healthy men. Workers gave them five low shots. Skin grew darker on the buttocks, face, and upper body in two men. The men got no extra sun [2]. All three men also had erections. The shots caused mild nausea. Each erection lasted from one hour to five hours [2].
A later test followed ten men with erection trouble caused by stress. Eight men had an erection after the shot. Firmness lasted 38 minutes on average. It lasted 3 minutes after the placebo, an inactive shot [3].
The findings are clear, but both tests were tiny. They can't show what years of use might do. Melanotan 2 can darken skin while changing hunger and sex drive. You can't make the other effects stop after tanning begins.
What each of the three compounds changes
Melanotan 2 is related to two approved drugs. Each approved drug was shaped for one main effect [4].
Afamelanotide (Melanotan I) mainly changes skin color. People with one rare illness feel great pain in sunlight. Two Phase 3 trials, the last large tests before approval, found longer time in sunlight without pain. People also had fewer severe skin burns from light [5]. The drug is approved for that illness.
Bremelanotide (PT-141) came from the Melanotan 2 work. Its makers kept more of the effect on sex drive [6]. It's approved for low desire in some women before menopause. Women in one study reported more desire after the drug. A brain area tied to body feelings and desire became more active during sexual pictures [7].
Melanotan 2 affects skin, hunger, and erections. No health agency approved it. The melanotan 2 vs pt-141 comparison explains the difference. The catch is simple. Approval of either related drug doesn't make the tanning compound approved or safe.
What people want and what can go wrong
Most people seek Melanotan 2 for a dark tan with less sun. Many also report less hunger or more sexual desire. Those claims come from users, not large tests [8].
The harms aren't small. Doctors have seen new moles and old moles turn dark. Some moles looked odd, and some users had melanoma, a grave skin cancer [9]. Medical reports also describe blocked blood flow to a kidney. Other people had severe muscle damage or erections that wouldn't stop. One person had brain swelling that improved with care [10].
You can't trust what an online vial holds. Tests have found false labels and unwanted matter [11].
Online reports of effects and risks can't show how often harm occurs. Melanotan 2 research includes no large human test. Published study amounts don't set a safe dose. The papers under Melanotan 2 references also can't tell you your own risk. Your doctor can help you weigh a new mole, pain, or other change.