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Precursors for NAD+ include: Nicotinamide Mononucleotide (NMN) Nicotinamide Riboside (NR) Nicotinamide (NAM/niacinamide) Nicotinic Acid (NA/niacin) Tryptophan (Trp) Oral supplements for NAD+ precursors are available, but much of their potency is lost during digestion
[25] Aller R, Izaola O, Gmez S, et al
This evidence gap is the single largest limitation of peptide-based approaches
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