This research used stable isotope tracing and microbiota-depleted mice to reveal that salvage NAD+ precursor supplements like nicotinamide (NAM) and nicotinamide ribose (NMR) don't actually boost NAD+, but depend on bacteria to first convert them into nicotinic acid. And that the resulting nicotinic acid is the converts to NAD+ via the Preiss Handler pathway.
Loss of fertility is associated with lower NAD+ levels. Restoring NAD+ in aged mice by putting nicotinamide mononucleotide (NMN) in their drinking water at 2g/L restored their fertility as well as the adverse effect of old age on the development of the embryo.
Most "niacin" products are niacinamide. If you want the form discussed in this research, look for nicotinic acid specifically.
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