Nicotinamide Riboside (NR)
A vitamin B3 precursor that efficiently raises cellular NAD+ levels, supporting energy metabolism, mitochondrial function, and healthy aging.
Nicotinamide Riboside (NR) is a naturally occurring form of vitamin B3 and a highly bioavailable precursor to nicotinamide adenine dinucleotide (NAD+), a coenzyme critical to hundreds of metabolic reactions in every cell of the body. NAD+ levels decline with age, stress, and disease, and this decline is associated with reduced mitochondrial efficiency, impaired DNA repair, and increased inflammation. NR supplementation robustly raises blood and tissue NAD+ levels in humans, with clinical trials demonstrating dose-dependent increases of 40–142% in whole blood NAD+. Unlike niacin, NR does not cause skin flushing, and unlike nicotinamide, it does not inhibit sirtuins at typical doses. Clinical research has explored its potential in cardiovascular health, neuroprotection, muscle function, metabolic disorders, and age-related cognitive decline. While preclinical data is striking, human clinical evidence is still accumulating, with multiple RCTs supporting safety and NAD+ elevation but mixed results on functional endpoints.
NR is efficiently converted to NAD+ via the NR kinase (NRK) pathway, significantly raising intracellular NAD+ concentrations in blood, muscle, and brain tissue.
Elevated NAD+ activates sirtuins (SIRT1–7), NAD+-dependent deacetylases that regulate mitochondrial biogenesis, DNA repair, and inflammatory gene expression.
NR promotes mitochondrial biogenesis and enhances oxidative phosphorylation efficiency by restoring NAD+/NADH ratios in aging tissues.
Raising NAD+ suppresses NF-κB-driven inflammatory pathways and reduces circulating pro-inflammatory cytokines in blood and cerebrospinal fluid.
NAD+ is an essential substrate for PARP enzymes that detect and repair DNA strand breaks, protecting genomic stability in aging cells.
How Nicotinamide Riboside works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
300–500 mg daily
Loading: No loading protocol established; some trials use dose escalation (e.g., starting at 250 mg and increasing to 1000 mg over 4 weeks)
Take with food
| Form | Type |
|---|---|
| 💊Nicotinamide Riboside Chloride capsules or powder | Recommended |
| 💊NR + Pterostilbene combination capsules | Alternative |
| 💊Free-base NR capsules | Alternative |
NR chloride (NIAGEN) has the most clinical evidence. Combination with pterostilbene (e.g., Tru Niagen or Basis by Elysium) may offer additional benefits. Avoid products that cannot verify NR content via third-party testing.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Morning dosing aligns with natural circadian NAD+ synthesis patterns. For doses of 1000 mg or more, splitting into two doses (e.g., 500 mg morning + 500 mg midday) may improve tolerability and maintain more stable NAD+ levels throughout the day.
Consistent, dose-dependent increase in whole blood NAD+ and related metabolites within 1–2 weeks of supplementation.
Many users report reduced daily fatigue and improved energy levels, particularly in middle-aged and older adults.
Cognitive metrics remain stable or show modest improvement in older adults; NR reduces cerebral blood flow in default mode network which may indicate improved efficiency.
Measurable decreases in circulating inflammatory cytokines in multiple clinical populations.
NR significantly increases NAD+ metabolome in aged skeletal muscle with anti-inflammatory transcriptomic signatures.
Nausea, bloating, or loose stools occur in some individuals, especially at higher doses.
NAD+ elevation is variable across individuals; some show large increases while others have modest responses to the same dose.
NR supplementation associated with modest reduction in epigenetic age as measured by PhenoAge and GrimAge clocks in older adults with MCI.
Insufficient safety data in human pregnancy; avoid unless directed by a physician. Animal studies suggest NR may be important for embryonic development but human data are lacking.
Insufficient data; avoid or consult healthcare provider before use.
No clinical data available in pediatric populations outside of specific disease states (e.g., ataxia telangiectasia). Not recommended for general use without medical supervision.
Generally well-tolerated; multiple RCTs conducted in this population. May be particularly beneficial given age-related NAD+ decline. Start with lower doses (250 mg/day) and titrate.
Consult oncologist before use. Theoretical concern about NAD+ supporting tumor cell metabolism; some evidence suggesting context-dependent effects.
Some clinical trials have been conducted in CKD; generally tolerated but monitor renal function. Consult nephrologist. High-dose supplementation may accumulate metabolites.
Use with caution at higher doses; monitor liver enzymes. Lower doses (≤300 mg/day) appear safe based on available data.
NAD+ is required for DNA repair; enhancing NAD+ may theoretically reduce the efficacy of DNA-damaging chemotherapy. Consult oncologist before use.
NR increases the NAD+ substrate available for PARP enzymes; co-administration with PARP inhibitors may reduce the drugs' efficacy.
Chronic alcohol consumption depletes NAD+ and may counteract NR supplementation benefits.
Statins inhibit CoQ10 and affect mitochondrial function; NR may provide complementary mitochondrial support, though no significant adverse interaction is documented.
Isoniazid inhibits NAD+ biosynthesis; NR may counteract drug-induced NAD+ depletion — generally a beneficial interaction but may affect drug monitoring.
Tip: Take with food; reduce dose and titrate up gradually
Tip: Usually transient; ensure adequate hydration
Tip: Take with meals; split doses
Tip: NR very rarely causes flushing unlike niacin; if it occurs, rule out other causes
Tip: Usually transient during first weeks; may resolve with continued use
Tip: Stay within recommended dose range (≤1000 mg/day for most users); monitor liver function if using >1000 mg/day long-term
Pterostilbene activates sirtuins (SIRT1) directly, while NR provides the NAD+ substrate for sirtuin activity — together they amplify sirtuin-dependent longevity and anti-inflammatory pathways.
Enhanced sirtuin activation, greater NAD+ metabolome elevation, and synergistic anti-inflammatory effects; studied together in multiple RCTs
Resveratrol activates SIRT1 and AMPK pathways; NR provides the NAD+ substrate. Together they support mitochondrial biogenesis and longevity signaling.
Complementary activation of NAD+-SIRT1 axis for mitochondrial health and longevity
CoQ10 supports the electron transport chain and mitochondrial ATP production; NR elevates NAD+ to feed the same mitochondrial machinery — complementary support for cellular energy production.
Comprehensive mitochondrial support through complementary mechanisms in the electron transport chain
Alpha-lipoic acid is a mitochondrial cofactor that regenerates antioxidants and supports the Krebs cycle; combined with NR's NAD+ elevation provides broader mitochondrial support.
Enhanced mitochondrial function through NAD+ elevation and improved redox cycling
PQQ stimulates mitochondrial biogenesis through CREB and PGC-1α; NR supports the NAD+ substrate for the same pathways — both target mitochondrial quantity and quality.
Synergistic mitochondrial biogenesis and enhanced cellular energy production
NMN is the direct biosynthetic precursor to NAD+ (one step closer than NR); NR and NMN share overlapping but distinct conversion pathways. They may be complementary at lower doses of each rather than stacking high doses.
Broader NAD+ pathway activation using both NR kinase and NMN adenylyl transferase pathways
Top studies from 28+ peer-reviewed papers
Prokopidis K et al. • Journal of cachexia, sarcopenia and muscle (2025)
“NAD+ precursor supplementation with NMN and NR shows potential for supporting skeletal muscle mass and function in aging populations.”
Gallagher C et al. • Ageing research reviews (2026)
“NAD+ precursor supplementation demonstrates consistent safety and NAD+ elevation in clinical trials, though functional benefits require larger and longer-duration studies to confirm.”
Braidy N et al. • Experimental gerontology (2020)
“Most studies indicated that the NAD+ precursors NAM, NR, NMN, and to a lesser extent NAD+ and NADH had a favourable outcome on several age-related disorders associated with the accumulation of chronic oxidative stress, inflammation and impaired mitochondrial function.”
Lippi L et al. • Aging clinical and experimental research (2022)
“NR and other NAD+ precursors consistently demonstrated mitochondrial-supportive effects in aging populations across reviewed RCTs.”
Alghamdi M et al. • Journal of Alzheimer's disease : JAD (2024)
“NAD+ precursors including NR show promise as a metabolic strategy for Alzheimer's disease by targeting energy deficits and neuroinflammation, though clinical evidence remains preliminary.”
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