# Melanotan 2 Dangers: Risks Documented in the Research > Melanotan 2 dangers documented in the published literature: melanoma and changing moles, kidney injury, priapism, PRES, and unregulated-product risk. Every claim cited. ## In plain English This page collects the Melanotan 2 dangers that doctors have actually written up in the medical literature — not rumors, but published case reports and reviews. The headline danger, and the reason this site leads with it, is what the compound does to moles. Because it switches on pigment cells everywhere, it can darken the moles you already have and bring out new ones, and a small number of people who used it were later found to have melanoma — a dangerous skin cancer. There are other documented dangers too: serious muscle and kidney injury, prolonged painful erections that are a medical emergency, a brain-swelling syndrome, and raised blood pressure. On top of all that, what is actually in a vial bought online is unknown. None of this is medical advice; it is a faithful summary of what the cited studies report. ## The mole and melanoma danger This is the central concern. Melanotan 2 is a non-selective melanocortin agonist, so it stimulates melanocytes — pigment cells — across the whole skin. The documented consequences in the dermatology literature are striking. Case reports describe eruptive new nevi appearing during use, including many new moles within 24 hours of a single injection [4][5]. Reports describe dysplastic (architecturally atypical) nevi, which carry increased melanoma risk [4][11]. A BMJ report linked changing moles to an unlicensed 'sun-tan jab' [13], and dermoscopy documented measurable change in existing lesions during use [10]. Most seriously, multiple reports document melanoma and melanoma in situ arising in users [7][8][9]. The causal question is genuinely open — these are case reports, not a controlled study, and no trial has tested whether the compound causes melanoma. But the mechanism is coherent: stimulating the melanocyte lineage stimulates the cells from which melanoma develops, and a patient with an inherited high-risk mole syndrome who combined the compound with sunbed use developed a dysplastic nevus [11]. The reasonable reading is caution, not reassurance: any new, changing, or darkening mole during or after use warrants prompt dermatological assessment. ## Is Melanotan 2 safe? What the record allows us to say [Is Melanotan 2 safe](/dangers#is-melanotan-2-safe) is the most-asked question, and the honest answer is that no one can claim it is. The compound never completed late-phase clinical trials, so its long-term safety in humans was never established [32]. The controlled human evidence is a handful of small Phase I studies; everything beyond that is case reports of harm and uncontrolled self-administration. Regulators including the US FDA, Australia's TGA, the UK's MHRA, and Ireland's HPRA have warned against melanotan tanning products, and dermatology bodies have flagged unregulated use as a public-health concern [27][28]. A review article specifically catalogues the harms of unregulated alpha-MSH analog use [29]. 'Not demonstrated safe' is the accurate description, and it is not the same as 'demonstrated safe at low doses.' ## Kidney, muscle, and vascular dangers Beyond the skin, the literature records serious systemic events. A case linked a Melanotan 2 injection to systemic toxicity with rhabdomyolysis — severe muscle breakdown [14] — and a separate case with literature review described renal infarction, the loss of blood supply to part of a kidney, attributed to its use [15]. The proposed mechanisms involve both a thrombotic (clot-promoting) influence and a possible direct toxic effect on kidney tissue. A case report also describes posterior reversible encephalopathy syndrome (PRES), a reversible brain-swelling condition presenting with headache, seizures, and visual disturbance, in association with use [19]. Underlying several of these is a pressor effect: preclinical work shows melanocortin agonists can raise blood pressure [20], an effect worsened by impaired nitric oxide signaling in animals [21]. ## Priapism: a urological emergency Because melanocortin signaling drives erections, several reports describe priapism — a prolonged, painful erection unrelated to arousal — following tanning injections, including after apparent overdose [16][17][18]. This is not a side note. Priapism is a medical emergency: erectile tissue starved of blood flow for too long can be permanently damaged. It is one of the clearest examples of a 'cosmetic' compound producing an acute danger that lands people in emergency care. ## The unregulated-product danger Every danger above is amplified by a problem that has nothing to do with the molecule and everything to do with the market. Analytical studies of melanotan products bought online repeatedly find inaccurate labeling, variable or unverifiable peptide content, and impurities [12][24], and the compound shows up in surveys of falsified and black-market injectables [26]. There is no quality control, so a buyer cannot know the actual identity, dose, purity, or sterility of what is in the vial. An unknown substance, injected, by an untrained person, with no medical oversight, is the real-world context for all of the documented harms — and it is why the [melanotan 2 side effects](/side-effects) page treats contamination as a danger in its own right. --- A measured digest of the published record on Melanotan 2 — an archive to be read, not a remedy to be followed.