NAD+ Pathway
NAD+ (Injectable)
Tier 2The coenzyme that powers mitochondrial function and DNA repair — direct administration.
NMN
Tier 2The Sinclair-popularized NAD+ precursor — direct conversion to NAD+ in cells.
NR (Nicotinamide Riboside)
Tier 2Most-studied NAD+ precursor in humans — Tru Niagen has 30+ clinical trials.