Melanotan II

Melanotan II is a synthetic cyclic peptide analog of alpha-melanocyte-stimulating hormone that acts as a non-selective agonist of melanocortin receptors to promote skin tanning via melanin production, enhance erections, and suppress appetite.

Brief glance

The primary outcome is Sexual Health, but it's also used for Performance. This compound is considered a Peptide. It is not currently indicated as compoundable in 503A pharmacies. It is not listed under a DEA schedule.

Overview

Melanotan II is a synthetic analogue of the peptide hormone α-melanocyte-stimulating hormone (α-MSH) designed to stimulate melanogenesis for skin tanning. It is administered via subcutaneous injection and may also increase sexual arousal, though it remains unlicensed and untested with health agencies advising against its use due to safety concerns. Potential side effects include nausea, flushing, darkening of moles, and unclear risks related to melanoma, often linked to increased UV exposure.

Melanotan II is a synthetic cyclic peptide analogue of the endogenous hormone α-melanocyte-stimulating hormone (α-MSH), designed to stimulate melanogenesis for skin tanning without sun exposure. It acts as a non-selective agonist at melanocortin receptors, particularly MC1R for pigmentation and MC4R for effects like increased sexual arousal and appetite suppression. Developed as a successor to afamelanotide (Melanotan I), it showed promise for erectile dysfunction and tanning but remains unlicensed and unapproved due to safety concerns and regulatory hurdles. Common side effects include nausea, flushing, and reversible darkening of moles, with unclear links to melanoma risk amid reports tied to UV exposure. It is widely available online despite health authority warnings against its use.

Benefits

Melanotan II, a cyclic analog of alpha-melanocyte stimulating hormone, induces skin tanning activity in humans through subcutaneous injection, with increased pigmentation observed after low doses every other day.¹ It activates melanocortin receptors such as MC4R to produce spontaneous penile erections lasting 1-5 hours, supporting its investigation for erectile dysfunction.¹,² Melanotan II also suppresses appetite via MC3R and MC4R pathways, leading to reduced body mass, lower intraabdominal fat, and decreased food intake in preclinical models, though chronic effects show tachyphylaxis.³,⁴ These properties position it as a research compound for photoprotective tanning and potential sexual dysfunction therapies, with bremelanotide derived from it for targeted arousal benefits.²,⁵ Evidence for other uses like rosacea or fibromyalgia remains insufficient.⁵

Side effects

Melanotan II, an unlicensed synthetic alpha-melanocyte-stimulating hormone analog used for tanning, commonly causes short-term side effects including facial flushing, nausea, vomiting, reduced appetite, spontaneous erections (priapism) in males, yawning, fatigue, headache, stomach cramps, and darkened skin.²,⁵,⁶,⁷,⁸ Long-term risks involve serious concerns such as melanoma and other skin cancers, changes in moles (darkening, new or atypical ones), kidney dysfunction or infarction, rhabdomyolysis, renal failure, melanonychia, potential vision loss, muscle tremors, stroke, and anaphylaxis.²,⁵,⁶,⁹,¹⁰,¹¹ Key safety considerations include its untested and unregulated status with no guaranteed quality, making it possibly unsafe especially via injection, and recommendations to avoid use without medical supervision due to wide-ranging adverse effects from melanocortin receptor overstimulation.²,⁵,⁶,⁹,¹⁰ Individuals with light skin or pre-existing conditions face heightened risks of skin changes and cancer.⁵ Reports also note systemic effects like tachycardia, hypertension, dizziness, and aggression.⁷

Mechanisms of action

Melanotan II is a synthetic analog of alpha-melanocyte stimulating hormone (α-MSH) that acts as a non-selective agonist at melanocortin receptors MC1R, MC3R, MC4R, and MC5R.¹²,¹³,¹⁴ Activation of MC1R on melanocytes stimulates melanogenesis, increasing eumelanin production for skin tanning and photoprotection.²,¹²,¹⁵ Its effects on sexual arousal and libido are primarily linked to MC4R activation in the brain, with possible involvement of MC3R, while MC3R and MC4R also regulate appetite suppression and energy homeostasis.¹²,¹³,¹⁶ MC5R contributes to additional effects like exocrine gland secretion and skin repair.¹³ This broad receptor binding explains its multifaceted physiological impacts beyond pigmentation.¹⁴,¹⁷