An Injectable Tan... What Could Go Wrong?
Spoiler: A lot.
I’ve read bits and pieces on this peptide, but it recently came up again after a client walked in praising “melatonin” for maintaining her tan with a simple weekly injection. (For the record, it’s Melanotan.)
What is it?
Melanotan I was developed to stimulate the MC1 receptor, which signals the body’s pigment-producing cells (aka melanocytes) to produce more melanin. That’s what’s responsible for our skin, hair, and eye color.
It has actually been in existence for decades as a medication to treat rare and very real painful skin disorders that cause light intolerance. Basically: a potentially toxic reaction to sunlight and even artificial light.
But… researchers later modified it, creating Melanotan II. This newer version not only increases melanin production faster, but also affects other parts of the body, with reported side effects including nausea, decreased appetite, and an increased libido.
It’s marketed online under catchy names like the “Barbie Drug” or “Vacation Vial,” making it sound more like a beauty hack than an unapproved injectable. As concern has grown, hashtags with Melanotan have even been restricted or banned on platforms like TikTok.
But many users remain unconcerned, dismissing warnings from dermatologists and medical journals in favor of the affiliate program from their favorite influencer or podcaster.
Perhaps most surprising is who is using it. This isn't just a trend among teenagers or young adults. A 2025 survey found the average user is 39 years old, with men representing the largest group of users. The peptide is readily available online, in gyms, and through questionable med spas.
What Makes it Concerning?
Since Melanotan stimulates the cells that produce pigment, it’s not exactly surprising that existing moles and freckles may darken, become more noticeable, and overall experience rapid change. Some people also report developing new spots.
While pigment changes alone don’t automatically mean cancer, they can make it more difficult for both patients and their dermatologists to identify the early warning signs of melanoma.
Delayed recognition of concerning lesions and more complicated skin examinations can ultimately delay a diagnosis. Dermatologists are trained to recognize subtle changes in moles that may indicate skin cancer. When it comes to melanoma, early detection is one of the most important factors in successful treatment.
Anything that can interfere with that detection deserves careful consideration.
Now let’s get into some rapid fire Myth vs. Fact…
Myth: “Melanotan protects me from the sun.”
Fact: It increases melanin production; it does not make you immune to UV damage. Your skin can still experience DNA damage that contributes to premature aging and skin cancer.
Myth: “But peptides are healthy!”
Fact: “Peptide” only describes the molecule. It never guarantees safety. Many peptides are prescription medications OR experimental compounds, and Melanotan II has not been approved for cosmetic tanning.
Myth: “Tanning is healthy. Only burning is harmful.”
Fact: A tan is your skin’s response to UV-induced DNA damage. Sunburn is simply a more severe form of that damage, but not the only harmful one.
Myth: “A base tan protects my skin.”
Fact: A tan provides very little natural UV protection (equivalent to approx. SPF 2-4). That’s nowhere near enough to replace sunscreen or prevent sun damage.
Myth: "I don't have to spend as much time in the sun, so it's safer."
Fact: Melanotan may help some people tan faster and burn less easily, but UV exposure can still damage your skin and increase your risk of premature aging and skin cancer, even if you don't develop a sunburn.
Myth: "We need vitamin D, so some tanning is healthy."
Fact: Most people can meet their vitamin D needs through diet, supplements, and incidental day-to-day sun exposure. Intentionally tanning is not necessary,
Myth: “If influencers are selling it, it must be safe.”
Fact: Social media testimonials aren’t the same as scientific evidence. Many people promoting Melanotan aren’t discussing product quality, long-term safety, or potential side effects; they’re looking to add to their own bottom line.
Myth: “It’s FDA approved.”
Fact: Melanotan II is not FDA-approved for cosmetic tanning, and products sold online are manufactured without the quality control required for approval.
My goal is never to shame, but to inform. I was genuinely surprised that day in the office when a client shrugged off the potential risks to stay golden year-round. It was a reminder of just how powerful beauty trends and influence can be… and how easily they can outweigh the evidence and information that’s out there.
Chasing a tan shouldn’t come at the expense of your health. Even if someone believes Melanotan is safe enough, the product they’re injecting may not be. The purity, dose, and even the contents of the vial often can’t be verified.
Before injecting an unregulated peptide, consider whether the promise of a tan is worth the unknowns that come with it.