Gut bacteria play an important role in NAD production. NAD boosting effect of oral NAM (nicotinamide) NR (nicotinamide riboside) is largely dependent on gut bacteria breaking them down to nicotinic acid, and that nicotinic acid being processed via Preiss Handler pathway. Nicotinic acid highly efficient at boosting NAD in mammals.
Most "niacin" products are niacinamide. If you want the form discussed in this research, look for nicotinic acid specifically.
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