MT-2 (Melanotan 2 Acetate)

Melanotan 2 (MT-2) is a cyclic heptapeptide developed to mimic the effects of ⁸$alpha$-MSH, a pituitary hormone.⁹ It is a research chemical that acts on the Melanocortin Receptor System, which regulates a wide range of physiological processes.

Key Mechanism of Action:

• Tanning (MC1R Activation): MT-2 binds to the Melanocortin 1 Receptor (MC1R) on melanocytes (skin cells) and stimulates the production of the darker pigment, eumelanin.
•  This results in skin darkening (tanning) without the need for extensive UV exposure.
• Sexual Function (MC4R Activation): By binding to the Melanocortin 4 Receptor (MC4R) in the central nervous system (hypothalamus), MT-2 can cause an increase in libido and is a potent initiator of spontaneous, non-sexually stimulated penile erections (a property that led to the development of the related, but distinct, approved drug bremelanotide).
• Appetite Suppression (MC3R/MC4R Activation): Its action on the hypothalamic MC3R and MC4R also mediates a reduction in food intake and overall appetite.

Common Administration:

• Subcutaneous Injection: MT-2 is typically reconstituted from lyophilized powder and administered via subcutaneous injection.

Major Concerns and Risks:

Due to its non-selective action and unregulated nature, MT-2 use is associated with several short- and long-term side effects, including: facial flushing, nausea, appetite reduction, darkening/creation of moles (nevi), and long-term concerns regarding potential increased risk of melanoma (skin cancer).