can melanotan darken hair Your body already makes a hormone that tells your skin to tan. 2 is a synthetic peptide engineered to mimic that hormone — but in a version that's more potent and longer lasting than Understanding Injection Tan and Melanotan
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doi: 10.1371/journal.pone.0280915 66
On the other hand, the increase of the C3-UQCRC2 has been shown to increase oxidative stress production from mitochondria (72)

One 10mg vial of MT2 will help maintain your tan for an extended period, even without additional sun exposure
Effect of chronic nicotine administration on the rat lung and liver: Beneficial role of melatonin

Li LY, Lu DL, Jiang ZY, Limbu SM, Qiao F, Chen LQ, et al