Source comparison
Best NAD+ Dosage for Cognitive Function: NMN vs NR Comparison
Before choosing a precursor and dose, understand how they differ in bioavailability, cost-effectiveness, and evidence base for neuronal uptake. Nicotinamide Riboside (NR) 250–500mg SLC52A2/A3 transporters; converts to NMN intracellularly $40–$80 Phase II human
This comparison does not assign a generated winner or score.
- Before choosing a precursor and dose, understand how they differ in bioavailability, cost-effectiveness, and evidence base for neuronal uptake.
- Nicotinamide Riboside (NR)
- 250–500mg
- SLC52A2/A3 transporters; converts to NMN intracellularly
- $40–$80
- Phase II human trials; hippocampal NAD+ increase confirmed in rodents
- Most clinically validated for brain-specific NAD+ elevation; higher cost but stronger human data
- Nicotinamide Mononucleotide (NMN)
- 250–500mg sublingual
- Slc12a8 transporter or CD73 conversion to NR
- $30–$60
- Limited human trials; mechanism supported by preclinical work
- Cost-effective; sublingual delivery bypasses first-pass loss; human cognitive trials still sparse
- Nicotinamide (NAM)
- 500mg (not recommended above this)
- NAMPT salvage pathway (rate-limited)
- $10–$20
- Widely studied but primarily for pellagra prevention, not cognitive enhancement
- Cheapest but least efficient for brain NAD+. NAMPT bottleneck limits neuronal uptake
- Niacin (NA)
- 100–250mg
- Converted to NAD+ via Preiss-Handler pathway
- $8–$15
- Cardiovascular studies; limited cognitive research
- Causes flushing; poor brain-specific targeting; not recommended for cognitive protocols