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Eumelanin vs Phaeomelanin: What Melanotan-2 Actually Produces
Human skin contains two types of melanin: eumelanin (brown-black pigment with photoprotective properties) and phaeomelanin (red-yellow pigment that offers minimal UV protection and may increase oxidative stress under UV exposure). Individuals with fair skin, r
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- Human skin contains two types of melanin: eumelanin (brown-black pigment with photoprotective properties) and phaeomelanin (red-yellow pigment that offers minimal UV protection and may increase oxidative stress under UV exposure). Individuals with fair skin, red hair, and poor tanning ability typically have higher phaeomelanin-to-eumelanin ratios due to MC1R polymorphisms that reduce receptor signalling efficiency.
- Melanotan-2 mechanism of action detailed reveals that it shifts melanin synthesis toward eumelanin production by fully activating MC1R even in individuals with receptor polymorphisms. When MC1R signalling is strong. Whether from natural α-MSH or exogenous melanotan-2. The tyrosinase pathway favours eumelanin synthesis. When MC1R signalling is weak or absent (as in individuals with loss-of-function MC1R variants), the pathway defaults to phaeomelanin.
- This is why melanotan-2 allows individuals who 'never tan' to develop pigmentation they couldn't achieve through sun exposure alone. The peptide compensates for genetic MC1R insufficiency by delivering supraphysiological receptor activation that overrides the polymorphism. The resulting tan is structurally identical to natural eumelanin. The difference is the signal source, not the pigment itself.