MT-1 (also known clinically as Afamelanotide) works by binding to melanocortin-1 receptors (MC1R) on melanocytes in the skin, triggering the production and release of eumelanin—the dark, photoprotective form of melanin. Unlike MT-2, Melanotan I has high receptor selectivity, meaning it avoids the sexual and appetite-suppressing side effects seen with MT-2. Key mechanisms:

• MC1R activation → stimulates melanin (eumelanin) synthesis

• Eumelanin production → darkens skin pigmentation naturally

• Photoprotection → shields against UV-induced DNA damage

MT-1 vs. MT-2:

• MT-1 = selective MC1R agonist, tanning-focused, fewer side effects

• MT-2 = broader MC1-4R activity, tanning + libido + appetite suppression

Benefits

1. Skin Tanning & Pigmentation

• Stimulates natural melanin production

• Produces a deep, even, and long-lasting tan

• Results achievable with minimal UV exposure

2. Photoprotection

• Increased melanin shields skin from UV radiation

• May reduce risk of UV-induced skin damage and burns

• Beneficial for those with light or UV-sensitive skin types

3. Skin Health

• Supports skin cell protection mechanisms

• May reduce UV-related skin aging

• Studied for use in photosensitivity disorders (EPP)

4. Favorable Side Effect Profile vs. MT-2

• No significant sexual function effects

• No appetite suppression

• Minimal nausea compared to Melanotan II