does melanotan 1 darken hair Peptides for tanning do exist. and Melanotan 2 both work at increasing melanin in the skin. Melanotan 1 takes longer to activate. Melnotan 1 is FDA approved. Melanotan 2 The “Barbie peptide” aka Melanotan
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But a report today of recent tests by ConsumerLab
Djouss L, Akinkuolie AO, Wu JH, Ding EL, Gaziano JM

Kuban W, Daniel WA (2021) Cytochrome P450 expression and regulation in the brain

AMPK activation : regulates blood glucose levels, optimizing mitochondrial function