Intravenous NAD+ and Oral NAD+ Precursors
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Oral nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) for raising tissue NAD+ levels, with a separate intravenous NAD+ protocol used at infusion clinics for longevity, cognitive, and addiction-recovery indications. The Brenner / Sinclair / Imai mechanism literature; the human-RCT outcome data (modest, with limited functional-endpoint signal); the IV protocol’s cost-and-discomfort trade-off (IV NAD+ infusions are notoriously uncomfortable).