Source comparison
Best NAD+ Dosage DNA Repair 2026: Comparison
Nicotinamide Riboside (NR) 500–1000mg Nucleoside transporters → NRK phosphorylation → NMN → NAD+ Moderate. Stable at room temp for 90 days in desiccant packaging; degrades under moisture/heat High. Multiple RCTs showing PARP activation and NAD+ elevation at 50
This comparison does not assign a generated winner or score.
- Nicotinamide Riboside (NR)
- 500–1000mg
- Nucleoside transporters → NRK phosphorylation → NMN → NAD+
- Moderate. Stable at room temp for 90 days in desiccant packaging; degrades under moisture/heat
- High. Multiple RCTs showing PARP activation and NAD+ elevation at 500–1000mg doses
- Best first-choice precursor. Strongest human trial data, reasonable stability, well-tolerated at clinical doses
- Nicotinamide Mononucleotide (NMN)
- Slc12a8 transporter (direct) or dephosphorylation to NR → absorption
- Low. Degrades within 48–72 hours at 25°C without desiccant; highly hygroscopic and light-sensitive
- Moderate. Smaller human trials, strong rodent data; NADPARK trial used 250mg with positive outcomes
- Effective but requires rigorous storage. Only choose if product uses UV-protective packaging and desiccant seals
- Nicotinic Acid (Niacin)
- 500–1500mg
- Preiss-Handler pathway → NAMN → NAAD → NAD+ (rate-limited by NAPRT enzyme)
- High. Very stable at room temperature; minimal degradation over 2-year shelf life
- Moderate. Raises NAD+ but less efficiently than NR/NMN; flushing side effect limits tolerability at effective doses
- Not ideal for DNA repair focus. Pathway bottleneck limits nuclear NAD+ delivery; flushing at ≥100mg makes high-dose protocols difficult
- Nicotinamide (NAM)
- Salvage pathway → NAMPT converts NAM to NMN → NAD+ (rate-limited by NAMPT availability)
- High. Stable under standard storage conditions
- Low for DNA repair. Inhibits sirtuins at high doses, reducing the very pathways NAD+ is meant to support
- Avoid for DNA repair protocols. Sirtuin inhibition counteracts intended benefits