# Melanotan 2 Effects, Reviews & Safety | Melanotan 2 > Melanotan 2 effects, reviews, and dangers: a frank, plain-English account of what people report — tanning, libido, appetite, nausea, moles — kept separate from cited safety findings. The upsides people chase and the downsides the literature records — set side by side, kept honest, and kept apart. ## Before the details People use Melanotan 2 for a fast, deep tan with little sun. Two other effects come along almost every time, because the same signal reaches the brain: less appetite and a stronger sex drive. Many users treat those as bonuses. Others find them unwelcome — a sudden erection at the wrong moment, or feeling sick and off your food. The honest state of the evidence is mixed. The tanning and sexual effects are real and were even seen in small, decades-old human studies. But Melanotan 2 was never tested in large trials, so its long-term safety is genuinely unknown. What is documented is a string of serious harms in case reports — darkening and new moles, melanoma, kidney and muscle injury, dangerous erections, and brain swelling. Below, the community reports come first (clearly labeled as anecdote), then the cited safety record. This is melanotan 2 reviews and risks read together, not a sales pitch and not medical advice. ## What people report **These are effects reported by the research-use community — anecdotal, not clinical evidence, and not verified by controlled trials. No doses are given.** **The benefits people chase:** - **A rapid, deep tan with little or no sun.** Very commonly described as the whole reason for using it — skin darkens within days and reaches a deeper color with far less sun or sunbed time than usual. - **Cosmetic satisfaction and confidence.** Many keep using it because they feel more attractive and like how they look, despite the side effects. Some discussions note this can tip into preoccupation with appearance. - **A darker tan some believe protects against burning.** Reported by some as a safety upside — though this is a user belief, not demonstrated protection, and many still report burning when they overdo sun exposure. **Effects people are split on:** - **Reduced appetite and weight loss.** Very commonly reported, often from the first dose and sometimes within the hour. People differ on whether they treat the appetite drop as a welcome bonus or an off-putting nuisance. - **Higher libido and spontaneous erections (men).** Commonly reported by men, often from the first or second dose — a surge in sex drive and unprompted erections, sometimes at inconvenient times. Some welcome it; others find it uncomfortable or embarrassing. Women also report heightened arousal. - **Spontaneous stretching and yawning.** A distinctive, frequently mentioned urge to stretch and yawn repeatedly after a dose; usually described as odd but harmless. **The downsides people report:** - **Nausea, sometimes with vomiting.** One of the most consistent effects, usually within the first hour and worst in the early days, often easing as people continue. - **Facial flushing and feeling hot.** The face going red and warm within minutes to an hour; short-lived but uncomfortable. - **Darkening of existing moles and freckles.** Very commonly reported and often the first visible sign — spots going noticeably darker and standing out more sharply. - **New moles appearing.** A recurring and alarming report among longer-term users — brand-new spots, sometimes many at once, occasionally within a day or two of a dose. This is often what sends people to a doctor. - **Darkening of lips, gums, scars, and genital or underarm skin,** which can look conspicuous; some describe new facial patches resembling melasma. - **An uneven, blotchy, or unnaturally long-lasting tan,** sometimes with an orange or grey cast, that can linger for weeks to months and fade patchily after stopping. - **Fatigue and lethargy** in the first days — a run-down, flu-like feeling many call the "melanotan flu." - **Injection-site reactions** — redness, swelling, itching, bruising, or small lumps, usually minor and short-lived. These reports line up with one published qualitative study of online discussion forums and a study of how the compound is marketed and perceived on social media — useful context, but still community observation, not trial data [8] [15]. ## Is Melanotan 2 safe? Safety and cautions The community reports above are not the safety record. The published literature documents specific, serious harms, and this is where the genuinely useful context lives. **New, changing, or darkening moles — and melanoma risk.** Because Melanotan 2 drives melanocyte activity throughout the skin, case reports describe eruptive new moles, atypical (dysplastic) moles, and darkening of existing ones after use [9] [16] [17] [18]. Dermoscopy studies record measurable changes in moles during use [19], and multiple case reports document melanoma and melanoma in situ in users [20] [21] [22], including in a teenager with a hereditary mole-melanoma syndrome who also used a sunbed [23]. The long-term melanoma risk is not established, but any new or changing mole during or after use warrants prompt dermatological assessment. **Rhabdomyolysis and acute kidney injury.** A published case links Melanotan 2 injection to systemic toxicity with rhabdomyolysis (severe muscle breakdown) [24], and a separate case with literature review describes renal infarction associated with its use [10]. These point to potential serious muscle and kidney injury through mechanisms that are not fully understood. **Priapism — a prolonged, painful erection.** Because melanocortin activity promotes erections, several case reports describe priapism following melanotan tanning injections, including after apparent overdose [25] [26] [27]. Priapism is a urological emergency that can permanently damage erectile tissue if not treated quickly. **Posterior reversible encephalopathy syndrome (PRES).** A case report describes PRES — a reversible condition involving brain swelling, presenting with headache, seizures, visual disturbance, and high blood pressure — in association with melanotan use [28], consistent with the compound's reported effects on blood pressure. **Cardiovascular and blood-pressure effects, plus nausea.** Preclinical work on the hemodynamic actions of alpha-MSH analogs shows melanocortin agonists can raise blood pressure [29], an effect worsened in animals by impaired nitric-oxide signaling [30]. Together with the very commonly reported nausea — which animal work ties to the compound's aversive effects [31] — this points to meaningful cardiovascular and gastrointestinal effects that are poorly characterized in humans using unregulated product. **Unregulated product: contamination and unknown content.** Analyses of melanotan products bought online repeatedly find inaccurate labeling, variable or unverifiable peptide content, and impurities [11] [32], and the compound appears in surveys of falsified and black-market injectables [33] [34]. With no quality control, a buyer cannot know the actual identity, dose, purity, or sterility of what is in a vial [12], which compounds every other risk [35]. **No approval, unknown long-term safety, and not a substitute for the approved cousins.** Melanotan 2 has never been approved by any regulator and did not finish late-phase trials, so its long-term human safety is unknown [12] [35]. Regulators and dermatology bodies have specifically warned against melanotan tanning products [36] [4]. It is sometimes confused with afamelanotide, the approved drug for the rare light-sensitivity disease erythropoietic protoporphyria [5] [37], and with the approved sexual-function agonist derived from this family [6] — but those approvals and their trial safety data do not extend to Melanotan 2, a different, unapproved compound used without medical oversight. ## Then and now Melanotan 2 was designed in the late 1980s by Victor Hruby, Mac Hadley, and colleagues at the University of Arizona as a superpotent cyclic analog of the natural pigment hormone alpha-MSH, meant to promote tanning and photoprotection and so perhaps reduce skin-cancer risk [4]. Early human work included the pilot Phase I study showing it could darken skin [2]; researchers then noticed it triggered erections, which led to the small erectile-dysfunction study [3] and ultimately to the spin-off agonist bremelanotide aimed at sexual dysfunction [6]. The original tanning program never reached the market. From the mid-2000s an illicit melanotan trade emerged, with the peptide sold online as unlicensed tanning injections — the so-called "Barbie drug" or "sun-tan jabs" — despite repeated warnings from regulators and dermatologists [38] [4]. It remains an unapproved research chemical with no sanctioned medical or cosmetic use [12]. --- A comparative reading of the Melanotan 2 record set beside its melanocortin cousins — the approved photoprotection and sexual-function analogs cited where their trials hold, the parent peptide's tiny old human data and documented mole, kidney, and priapism harms kept in plain view, and the community reports pinned to one side as anecdote; no clinic behind the name and nothing here dosed, sourced, prescribed, or sold.