NMN Pharmacokinetics: How Nicotinamide Mononucleotide Crosses Membranes, Reaches Tissues, and Restores NAD+ Pools
NMN faces a pharmacokinetic paradox: it raises NAD+ in tissues even though most oral doses are degraded before absorption. Understanding the Slc12a8 transporter and the NMN-to-NR-to-NMN cycle explains why delivery route fundamentally shapes outcomes.