Vitamin B3 forms as precursors to NAD+: are they safe?

ConclusionThe data for some NAD+ precursor forms are scarce. Safety levels were estimated by extrapolating the experimental data. As the effects of NAD+ are through the regulators of DNA repair, stress responses and energy metabolism, it seems worthwile to test the NAD+ supplemments in a manner similar to drug development.
Source: Trends in Food Science and Technology - Category: Food Science Source Type: research