Niacinamide supplementation and skin cancer incidence
In this meta-analysis of randomized controlled trials, niacinamide supplementation did not reduce the incidence of nonmelanoma skin cancers among adults with a history of this condition (some of whom were immunocompromised).
The effect of nicotinamide mononucleotide on physical function in older men
Supplementing with NMN boosts NAD levels and increases physical performance
Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women