Healthcare Tanning Influencers Push ‘Barbie Peptide.’ Here Are Risks Of Melanotan By Bruce Y. Lee ,
Forbes contributors publish independent expert analyses and insights. Bruce Y. Lee, M.D., MBA, covers health, medicine, wellness and science Follow Author Aug 07, 2026, 10:16pm EDT Aug 07, 2026, 10:22pm EDT --:-- / --:-- This voice experience is generated by AI. Learn more . This voice experience is generated by AI. Learn more . Summary Social media "tanfluencers" are pushing Melanotan II, or the "Barbie peptide," for a quick tan, but this unapproved substance carries extreme health risks. Despite claims of a "base tan," the synthetic peptide, mimicking a natural hormone, can lead to severe issues like melanoma, rhabdomyolysis causing kidney failure, and renal infarction. Users have also reported alarming side effects, including a painful 22-hour erection, dull gray skin, nausea, and fatigue. Health officials warn against using this FDA-unapproved drug due to its potentially life-threatening and unpredictable consequences.
“Tanfluencers” have been touting the use of melanotan II—which has been dubbed the “Barbie peptide”—as a way of quickly getting a tan without the sun. But before you “Barbie-cue” your skin in such a manner to get darker, consider the potential risks—such as rhabdomyolysis and melanoma—of this medication that has not been approved by the U.S. Food and Drug Administration. (Photo: Getty) getty Y ou may have seen “tanfluencers” on social media pushing the use of melanotan II—which has been dubbed the “Barbie peptide”—as a way of quickly getting a tan without the sun. But before you “Barbie-cue” your skin in such a manner to get darker, consider the potential risks—such as rhabdomyolysis and melanoma—of this medication that has not been approved by the U.S. Food and Drug Administration. And think hard about what happened to a 41-year-old Scottish man who injected melanotan and then experienced a 22-hour unrelenting painful erection. Yes, that’s right, 22 hours.
Melanotan II is known as the “Barbie peptide” because, one, it’s a peptide—which is a short chain of amino acids that can serve as a messenger in the body. And, two, it’s being touted as a way to give you the lean, tanned look of a Barbie doll without ultraviolet radiation exposure. Such a look may seem enticing because who doesn’t want to look like a Barbie doll, with a waist so narrow that it couldn’t possibly house a normal-sized liver and intestines and an elongated neck that could give an ostrich a run for its money.
Yes, a Barbie doll is not exactly natural and the same can be said about melanotan II. This synthetic peptide is designed to mimic a hormone that you should already have in your body—namely alpha-melanocyte stimulating hormone or α-MSH. It’s called “melanocyte stimulating” because stimulate is what it does to melanocytes, the cells in your skin that produce various pigments—known as melanin—that give your skin its color. When α-MSH binds to melanocortin 1 receptors, it stimulates the production of melanosomes in melanocytes that in turn produces two types of pigments: eumelanin or pheomelanin. Injecting melanotan II under your skin can presumably do the same thing.
That’s why certain “tanfluencers”—which is a portmanteau of “tan” and “infleuncers”—have been touting melanotan II as part of the “tanmaxxing” arsenal. Back in May, I covered in Forbes this whole tanmaxxing social media trend, which is about encouraging people to get deeper and darke…