Cutis 2013. Supports Cellular Energy and NAD⁺ Production. NAD⁺ fuels mitochondrial ATP production, DNA repair, and antioxidant defense. Cellular energy / NAD⁺ support Direct NAD⁺ precursor ⭐⭐⭐⭐. Common side effects Rare; high doses may cause mild nausea or fatigue in sensitive users.