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Yes, B12 plays a role in cell production and repair, which contributes to healthier hair growth, stronger nails, and clearer skin

Dong J, Wang W, Zhou W, Zhang S, Li M, Li N

However, levels of NAD+ tend to decline as you get older, which has been associated with some age-related conditions

Scientia Sin (1964) 13:13435

Melanotan-II has been investigated extensively in the literature for its activity at melanocortin receptors, particularly MC1R and MC4R