Melanotan 2 in the UK: MHRA Warnings, Legal Status and Reported Side Effects

LynxLab · 24 October 2026 · 7 min read

What the MHRA has said about Melanotan 2 nasal sprays and injections, where UK law draws the line, and what the medical case reports describe. Sources linked.

Photo: David Trinks, Unsplash

Melanotan 2 is the peptide behind the "tan jab" and the nasal tanning sprays that circulate on social media. It is also one of the few research peptides with an explicit, repeated warning from the UK medicines regulator attached to it. This explainer sets out what the Medicines and Healthcare products Regulatory Agency (MHRA) has actually said, where the legal line falls between a cosmetic, a medicine and a laboratory reagent, and what the medical literature records about people who used it.

In chemical terms, melanotan 2 is a synthetic analogue of alpha-melanocyte stimulating hormone (alpha-MSH), the hormone that tells pigment cells to make more melanin. It was designed at the University of Arizona in the late 1980s and never completed clinical development. Everything sold today as a tanning product is unlicensed.

What the MHRA has said about Melanotan 2

The MHRA's position has not changed in over a decade. In a Freedom of Information response dated 17 April 2024, the agency wrote that products containing Melanotan II "may cause serious side effects, so our advice to those who have used Melanotan II injections or nasal sprays is to stop using them immediately" (MHRA FOI 24/274, gov.uk, 2024).

The same letter states that the sale, supply and advertising of unauthorised medicines is not permitted under the Human Medicines Regulations. It adds that the MHRA "has repeatedly taken action to remove Melanotan products from the market for over 10 years".

BBC News reported in February 2022 that the MHRA said it had spent 10 years targeting melanotan products, and that dozens of influencers were still promoting tanning injections and nasal sprays to millions of followers (BBC News, 2022).

Where the legal line falls: injections, pens and nasal sprays

The MHRA's FOI response is unusually specific about classification. Products containing Melanotan II are classified as medicines if they are injectable or come as pens. A nasal spray containing Melanotan II is treated as a medicine only if it is sold with claims to treat or prevent disease.

That distinction is why nasal tanning sprays have been so hard to police. They are sold as cosmetics, so they sit outside the medicines regime, yet the Chartered Trading Standards Institute (CTSI) told the BBC in May 2025 that they are not covered by UK cosmetics regulations either (BBC News, 2025). Richard Knight, the CTSI's lead officer for cosmetics and beauty, called them a "wild west-type product".

Cancer Research UK puts the position for the public in one line: it is illegal to sell and supply Melanotan injections in the UK (Cancer Research UK, 2023). Using or promoting the products is not itself an offence, as the BBC noted in 2022, but selling them for human use is.

For anyone searching for melanotan 2 uk suppliers, the practical point is that no tanning product containing the peptide has ever been authorised by the MHRA. There is no licensed version, no approved dose and no safety assessment on file.

What the Yellow Card figures do and do not show

Sixteen reports in eleven years sounds small, and the MHRA is careful to say why the figure cannot be read as a measure of harm. Yellow Card reporting is voluntary, reporters need only suspect a link, and reporting rates depend on publicity and on how easy a reaction is to recognise.

For an unlicensed product bought from social media, under-reporting is likely to be severe. A user who develops a new mole after a nasal spray bought on Instagram has little reason to connect the two, and there is no pharmacist or prescriber in the loop to file a report. The MHRA also notes that it has made no specific recommendations in response to these reports, because its advice to stop using the products already stands.

The BBC's own count is a useful comparison. In its 2022 investigation it spoke to 20 people who had experienced complications after using mt2 tanning products, including lesions, fungal infections and abscesses.

What the medical literature records

The published case reports fall into three groups: skin changes, acute systemic reactions and priapism.

Skin first. A 2017 review by Habbema and colleagues in the International Journal of Dermatology found that unregulated use of melanotan I and II was associated with melanocytic changes in existing moles and newly emerging, sometimes dysplastic, naevi. Four case reports described melanomas arising from existing moles during or shortly after melanotan use (Habbema et al., Int J Dermatol, 2017). The authors stressed that conclusive evidence of causation is lacking, but noted that national health bodies in several countries had issued warnings.

Acute toxicity second. Nelson and colleagues at Stroger Hospital in Chicago described a 39-year-old man who injected Melanotan II bought online and arrived in the emergency department two hours later with body aches, sweating and anxiety. He developed rhabdomyolysis, the breakdown of muscle tissue, together with kidney dysfunction (Nelson et al., Clinical Toxicology, 2012).

Priapism third. The 2021 report from a Miami urology team described acute ischaemic priapism after a subcutaneous injection of the mt ii peptide. Aspiration and phenylephrine failed and the patient needed an operation (Mallory et al., Sexual Medicine, 2021).

The erection-inducing effect is not a surprise. It was documented in the original University of Arizona volunteer studies in the 1990s, which are covered in the history of Melanotan 2.

What was actually inside the products tested

Two BBC investigations have had products chemically analysed. In 2022, research chemists at Imperial College London examined 10 tanning kits. They would expect around 10 ingredients in a licensed medicine; some of the kits contained more than 100 unidentified ingredients alongside the melanotan-2 itself. Professor Tony Cass compared the risk to Russian roulette.

In 2025 the BBC bought 10 nasal sprays online and from beauty salons, sunbed shops and a gym. Melanotan II was found in varying strengths in six of them. The other four contained none, which means buyers were inhaling an unknown liquid with no active peptide at all.

That finding is the part of the story that matters most for anyone handling the peptide in a laboratory. A consumer product with no ingredients list, no batch testing and no declared strength is not the same material as a characterised research reagent, even when both are labelled "MT2".

Where research-grade Melanotan 2 fits

Research chemical suppliers sit in a different category from the sellers the MHRA and Trading Standards are pursuing. A freeze-dried peptide sold strictly as a laboratory reagent, with no claims for human use and no medicinal presentation, is not a medicine under the definitions the MHRA set out in its 2024 letter. The moment a vendor suggests tanning, the product becomes one, and the sale is illegal.

That is the standard a serious buyer should hold a supplier to. melanotan ii for research should come with a batch-specific analysis, a declared purity and no instructions for human use. If a listing reads like a tanning advert, it is one.

LynxLab stocks melanotan 2 10mg vials for research use at £24.99, tested to 99% purity with the lab reports on the product page.

Frequently asked questions

Is Melanotan 2 legal in the UK?

Selling, supplying or advertising Melanotan 2 as a medicine, which includes any injectable or pen product, is not permitted under the Human Medicines Regulations. Possessing or using it is not an offence. Research-grade peptide sold as a laboratory reagent with no claims for human use falls outside the medicines definition.

Are nasal tanning sprays illegal?

A nasal spray containing Melanotan II is only classed as a medicine if it is sold with claims to treat or prevent disease, so most are sold as cosmetics. Trading Standards says they are not covered by UK cosmetics regulations either. The CTSI issued a public warning against them in May 2025.

Has the MHRA banned Melanotan 2?

There is no single ban. The MHRA says it has repeatedly removed Melanotan products from the market for more than 10 years, and its advice to anyone who has used the injections or nasal sprays is to stop. No Melanotan 2 product has ever been authorised in the UK.

Can I buy Melanotan 2 for research in the UK?

Yes, as a laboratory reagent. Anyone who wants to buy melanotan 2 for research should expect a certificate of analysis for the batch, a stated purity and no usage claims. Any listing that mentions tanning is an illegal medicine sale, whatever the label says.

Sources

Research use only

Melanotan 2 from LynxLab

10mg vials from £24.99. ≥99% purity, lab report on the page. Same-day dispatch, UK stock.

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