No, nasal tanning sprays aren’t safe. They contain a synthetic peptide called Melanotan II, which isn’t approved for cosmetic use by any major health authority, isn’t tested for safety or consistency, and has been linked to side effects ranging from nausea and facial flushing to darkened moles and, in rare documented cases, melanoma.
Melanotan II has picked up a lot of attention on TikTok and Instagram lately, often marketed as a “safe and natural” way to tan without the sun. It isn’t natural, and dermatologists and government health agencies in the UK, US, and Australia have all specifically warned against it.
Key Takeaways
- Melanotan II is a synthetic peptide that mimics your body’s natural melanocyte-stimulating hormone (α-MSH) and triggers melanin production independent of UV exposure.
- It’s sold as a nasal spray (and sometimes as an injectable), and it’s illegal to sell for tanning purposes in the UK, US, and Australia.
- Because it’s unregulated, formulations are inconsistent — there’s no reliable way to know the actual dose or purity of what’s in any given product.
- Reported side effects include nausea, vomiting, decreased appetite, facial flushing, and darkening or increase in the number of moles and freckles.
- Case reports have linked Melanotan II use, including nasal spray use, to melanoma, including a rare mucosal melanoma case.
- Even where it works, Melanotan II pigmentation doesn’t protect skin from UV damage the way sunscreen does.
- Self-tanner and spray tan remain the only tested, widely regarded safe ways to get a deep tan without sun exposure.
What Is Melanotan II?
Melanotan II is a lab-made peptide that copies alpha-melanocyte-stimulating hormone (α-MSH), a hormone your body already produces. It binds to melanocortin receptors on melanocytes and pushes those cells to produce more melanin, the pigment responsible for skin color, without needing UV light to trigger the process the way outdoor or bed tanning does.
It was originally developed at the University of Arizona in the 1980s and studied in a small early clinical trial as a potential option for skin cancer prevention and erectile dysfunction, not as a cosmetic tanning product. That original human study involved just three volunteers receiving controlled subcutaneous injections, and it documented dose-limiting nausea, flushing, and fatigue even under monitored conditions. It was never developed into an approved tanning drug.
Today it’s sold online and in some tanning salons or beauty shops as a nasal spray, marketed under names like “tanning nasal spray” or sometimes nicknamed the “Barbie drug.” It’s a different mechanism entirely from self-tanner, which works by reacting with dead skin cells on the surface rather than stimulating melanin production inside the body.
How Does Nasal Tanning Spray Actually Work?
The inside of your nose is lined with mucosa, not skin, and mucosa doesn’t offer the same barrier that skin does. That means whatever you spray up there is absorbed into your bloodstream quickly and efficiently. Once Melanotan II enters circulation, it stimulates melanin production throughout the body, which is why users report tanning in places that never see the sun. Some products also combine it with dihydroxyacetone (DHA), the same self-tanning ingredient used in spray tans, which adds a surface color effect on top of whatever internal pigmentation the peptide produces.
Is Melanotan II Legal?
No. Melanotan II is unlicensed and it’s illegal to sell for tanning purposes in the United Kingdom, the United States, and Australia. It has never gone through the approval process any medical or cosmetic product needs to be legally marketed for this use, which means there’s no requirement for manufacturers to prove it’s safe, effective, or even consistently dosed.
What Are the Risks?
Inconsistent, Unregulated Formulations
Because Melanotan II products aren’t regulated, there’s no oversight of what’s actually in the bottle. Testing of products sold online has found meaningful inconsistencies in how much active peptide different batches actually contain, and there’s no way to verify the product doesn’t also contain other, undisclosed ingredients.
Short-Term Side Effects
The original phase-I clinical study of Melanotan II, conducted under controlled medical supervision with just three volunteers, still produced dose-limiting nausea and fatigue [Dorr et al., Life Sciences, 1996]. Outside of a clinical setting, users of nasal tanning sprays and injectable Melanotan have reported a wider range of symptoms, including vomiting, decreased appetite, facial flushing, gastrointestinal upset, and prolonged erections.
Changes to Moles and Skin Cancer Risk
This is the risk dermatologists flag most. Melanotan II use has been associated with the darkening of existing moles and the appearance of new ones, and a small number of case reports describe melanoma developing in people who used it. One recent case report described a mucosal melanoma — a rare form that develops on mucous membranes rather than skin — in a young woman who had been using a Melanotan II nasal spray for tanning [Alsabbagh et al., International Journal of Oral and Maxillofacial Surgery, 2025]. These reports don’t prove Melanotan II directly causes melanoma — the numbers are still small, and many users also tan under UV separately, which muddies the picture — but they’re a consistent enough signal that health authorities treat it as a real concern rather than a coincidence.
It Doesn’t Protect Your Skin From UV
Even in cases where Melanotan II successfully darkens the skin, that pigmentation doesn’t function as meaningful sun protection. Anyone using it still needs the same sunscreen and sun-safety habits as anyone else — the tan itself isn’t doing the protective job people sometimes assume it is.
What Do Health Authorities Say?
Cancer Research UK states plainly that Melanotan nasal sprays and injections are not safe to use, noting they haven’t been tested for safety, quality, or effectiveness. Australia’s Therapeutic Goods Administration has issued a similar public warning about melanotan products, citing reports of increased moles and freckles, kidney dysfunction, and, in some cases, swelling of the brain. The Cleveland Clinic has also warned against nasal tanning spray specifically, pointing to how quickly the nasal mucosa absorbs the peptide into the bloodstream.
Safer Ways to Get a Deep Tan
If the actual goal is a deep, even tan, you don’t need an unregulated peptide to get there. Self-tanner and professional spray tanning use DHA to react with the surface layer of skin, producing color that’s genuinely hard to distinguish from a natural tan, with a well-established safety record and no need to inhale or inject anything. If you’re chasing a deep tan because you like how melanin-heavy skin looks, it’s worth reading about the broader tanmaxxing trend too — the same “darker is better, whatever it takes” mindset shows up there, and it carries its own well-documented risks.
Frequently Asked Questions
What is Melanotan II used for?
Melanotan II is marketed as a tanning aid that stimulates the body’s own melanin production. It was originally studied in a small clinical trial for skin cancer prevention and erectile dysfunction, but it was never approved for either use.
Is nasal tanning spray legal?
No. Melanotan II is illegal to sell for tanning purposes in the UK, US, and Australia, though it continues to circulate through online sellers and some salons.
What are the side effects of Melanotan II?
Commonly reported side effects include nausea, vomiting, decreased appetite, facial flushing, and gastrointestinal upset. More serious reported effects include darkening or increase of moles, kidney dysfunction, and case reports of melanoma.
Does Melanotan II protect your skin from sunburn?
No. Even when it darkens skin, that pigmentation doesn’t provide meaningful UV protection, so you still need sunscreen and normal sun safety precautions.
Is nasal tanning spray the same as self-tanner?
No. Self-tanner uses DHA to react with dead skin cells on the surface and has a strong safety record. Nasal tanning spray delivers a hormone-mimicking peptide into your bloodstream to stimulate melanin production internally, which is a completely different — and unregulated — mechanism.
Can Melanotan II cause melanoma?
Case reports have linked its use to melanoma, including a documented case of mucosal melanoma following nasal spray use, and to darkening or growth of existing moles. A direct causal link hasn’t been definitively proven, but health authorities treat the signal seriously enough to warn against use.
Conclusion
Melanotan II promises a shortcut to a deep tan without the sun, but the actual trade-off is trading UV exposure for an unregulated, unapproved peptide with a real record of side effects and a concerning, if not fully proven, link to melanoma. It’s illegal to sell for this purpose in the UK, US, and Australia for good reason. If the goal is simply the look of a deep, even tan, self-tanner gets you there with none of that risk.
Research Sources:
Dorr RT, et al., 1996, Life Sciences, “Evaluation of Melanotan-II, a superpotent cyclic melanotropic peptide in a pilot phase-I clinical study”
The original human pilot study of Melanotan II, documenting dose-limiting nausea and fatigue even under controlled, monitored dosing.
Alsabbagh AY, Bhujel N, Singh RP, 2025, International Journal of Oral and Maxillofacial Surgery, “Melanotan II nasal spray: a possible risk factor for oral mucosal malignant melanoma?”
A case report describing a rare mucosal melanoma in a young woman following use of a Melanotan II nasal spray for tanning.
Cancer Research UK, “Tanning, fake tan and Melanotan”
States that Melanotan nasal sprays and injections are not safe, noting they haven’t been tested for safety, quality, or effectiveness.
Therapeutic Goods Administration (Australia), “Don’t risk using tanning products containing melanotan”
A government safety warning citing reports of increased moles and freckles, kidney dysfunction, and brain swelling associated with melanotan products.
Cleveland Clinic, “Why You Should Never Use Nasal Tanning Spray”
A dermatologist-reviewed explainer on how nasal tanning spray works and why the nasal mucosa route of absorption increases risk.