Melanotan II Therapy

Melanotan II is a non-selective melanocortin receptor agonist, activating MC1R through MC5R to varying degrees. Activation of MC1R on melanocytes stimulates eumelanin production, resulting in increased skin pigmentation (tanning) without UV exposure. MC4R activation in the brain's hypothalamus influences appetite suppression, sexual arousal, and energy homeostasis. MC3R activation may affect fat metabolism and energy partitioning. This broad receptor profile is responsible for Melanotan II's diverse effects but also means it is less targeted than peptides developed for specific melanocortin receptor subtypes. The peptide has a relatively long duration of action due to its cyclic structure, which confers resistance to enzymatic degradation.

Melanotan II is most commonly sought by individuals with very fair skin who wish to achieve pigmentation with minimal UV exposure. Some patients seek it for its sexual enhancement effects, though PT-141 is generally preferred for this specific application due to its greater selectivity. Individuals interested in the combined tanning and appetite-modulating effects sometimes prefer Melanotan II for its multi-target profile.

Melanotan II is administered via subcutaneous injection, typically starting with a low loading dose and gradually increasing. A common protocol involves daily injections during a loading phase of two to four weeks, followed by a reduced maintenance dose of once or twice weekly. Sun exposure or UV exposure during the loading phase may enhance and direct pigmentation effects. Nasal spray formulations exist but are generally considered less reliable in absorption.