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 NAD+ precursors on cardiovascular risk factors
The effects of niacin and its derivatives on glucose and blood lipids
CoQ10 + NADH for chronic fatigue