Melanotan II

Melanotan II is a synthetic peptide studied for its ability to darken skin pigmentation, enhance libido, and influence energy regulation by mimicking the effects of alpha-MSH.
Melanotan II is a research compound and is not approved by the FDA for use in humans. This content is provided for educational purposes only.

What is Melanotan II?

Melanotan II (MT-II) is a synthetic analog of the naturally occurring alpha-melanocyte-stimulating hormone (α-MSH). It was originally developed to stimulate melanin production (pigment in the skin), but has also demonstrated effects on sexual function, appetite regulation, and energy balance. It binds to multiple melanocortin receptors (MC1R–MC5R), particularly MC1R (for tanning) and MC4R (linked to sexual arousal).


Potential Benefits Shown in Studies

  • Stimulating natural skin tanning by increasing melanin
  • Enhancing libido and improving erectile function
  • Reducing appetite and supporting fat loss
  • Providing potential UV protection by darkening skin
  • Supporting mood and energy levels through CNS effects
  • Helping regulate body weight and metabolism

Mechanisms of Action

Melanotan II works by:

  • Activating melanocortin receptors in the skin and brain
  • Stimulating melanin production in melanocytes (skin cells)
  • Enhancing sexual desire and erectile function via MC3R and MC4R activity
  • Reducing appetite and affecting metabolic regulation through CNS pathways

Its broad receptor activity explains its diverse physiological effects beyond tanning.

Research Highlights

Potent Tanning Agent via α‑MSH Analog Action

Melanotan II is a synthetic analog of alpha‑melanocyte-stimulating hormone (α‑MSH), effectively inducing melanin production through activation of melanocortin receptors, especially MC1R for pigmentation.

Source: wikipedia

Sexual Arousal Through Melanocortin Receptor Activation

MT‑II has shown aphrodisiac-like effects and can induce erections by stimulating MC4R receptors in humans.

Source: wikipedia

Molecular Structure

Sequence

Ac-Nle-c[Asp-His-D-Phe-Arg-Trp-Lys]-NH₂

Molecular Formula

C₅₀H₆₉N₁₅O₉

Molecular Weight

1024.18 g/mol

Source
PubChem

Note: "c" denotes a cyclic structure; Nle = norleucine

Sources