The skin is increasingly deficient in NADH and NAD which control intralar synthesisThe whole process of formation and decomposition. Niacinamide acts as a precursor to NADH and NADand works by regulating the balance of both levels in the body. High levels of NADplay a large role in soothing proteins and sugars that occur spontaneously in sugars .Reaction. Relieve water loss, relieve melanin production.