Melanotan is a cosmetic peptide that stimulates a natural increase in melanin production. Melanin is the main determinant of skin colour in humans. It is a brown pigment, which causes skin to become darker in appearance instead of red when exposed to UV rays. Typically when your skin is exposed to UV rays (the sun or tanning beds) your skin will release melanin as a natural defense to protect your skin from absorbing an excess amount of solar radiation.
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