How Long Does It Take For Melanotan To Work? Aesthetics Infinity Medical Institute Can Your Eyes Change Color? The EyeDoctors Optometrists Your body already makes a hormone that tells your skin to tan. Melanotan 2 is a synthetic peptide engineered to mimic that hormone but in a version that's more potent and Changing your eye color is easier than you think. But should you? Sun Sentinel Nitisinone increases melanin in people with albinism National Institutes of Health (NIH)