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Nicotinamide Riboside (NR)
A form of vitamin B3 that efficiently raises NAD+ levels to support neuronal energy production, DNA repair, and neuroprotection - the first NAD+ precursor to gain widespread clinical validation.
Benefits
What is Nicotinamide Riboside (NR)?
Nicotinamide riboside (NR) is a form of vitamin B3 and a precursor to nicotinamide adenine dinucleotide (NAD+) that was first identified as a NAD+ precursor by Dr Charles Brenner at Dartmouth College in 2004. It is converted to NAD+ via the enzyme nicotinamide riboside kinase (NRK), a pathway distinct from both niacin (which uses the Preiss-Handler pathway) and NMN (which uses NMNAT). NR was the first NAD+ precursor to be developed into a commercial supplement (marketed as Niagen by ChromaDex) and has the longest track record of human clinical data among NAD+ boosters.
A 2018 landmark study published in Nature Communications (the CHROMAVITA trial) demonstrated that NR supplementation at 1,000 mg/day for six weeks safely and effectively raised whole blood NAD+ levels by 60% in healthy older adults. A 2023 trial published in Aging Cell found that NR improved mitochondrial membrane potential and reduced inflammatory biomarkers in middle-aged and older adults. For brain-specific effects, a 2022 study in Aging Cell showed that NR crossed the blood-brain barrier and increased NAD+ in cerebrospinal fluid. Pre-clinical research has demonstrated neuroprotective effects in models of Alzheimer's disease, with NR supplementation reducing tau pathology, neuroinflammation, and synaptic dysfunction in transgenic mice.
- NAD+ synthesis via NRK pathway: Converted to NMN by nicotinamide riboside kinase, then to NAD+ by NMNAT - a two-step pathway to NAD+ replenishment
- Sirtuin activation: Elevated NAD+ activates SIRT1 and SIRT3, supporting mitochondrial biogenesis, DNA repair, and anti-inflammatory gene expression
- Mitochondrial rejuvenation: Restores mitochondrial membrane potential and function in ageing cells, directly improving neuronal energy capacity
- Axonal protection: SIRT2 activation by NAD+ supports myelination and axonal integrity, protecting nerve signal transmission
- Inflammatory reduction: Reduces circulating inflammatory cytokines and C-reactive protein in human trials
- Blood-brain barrier penetration: Clinical evidence confirms NR reaches the central nervous system and raises brain NAD+ levels
- Standard dosage: 300-1,000 mg per day
- Clinical trial dosage: Most human studies have used 250-1,000 mg daily
- Timing: Take in the morning to align with circadian NAD+ rhythms
- With or without food: NR is well absorbed either way, though taking with food may reduce mild gastrointestinal effects
- Onset: NAD+ elevation is measurable within one week. Subjective energy improvements may be noticed within 1-2 weeks. Neuroprotective benefits are long-term
- NR vs NMN: Both effectively raise NAD+. NR has more published human clinical data; NMN has a more direct conversion pathway. Both are considered effective
- Well tolerated: Generally safe at doses up to 2,000 mg/day in clinical studies
- Mild side effects: Occasional nausea, headache, fatigue, or diarrhoea, typically at higher doses
- Flushing: Unlike niacin, NR does not cause flushing
- Cancer consideration: Same theoretical concern as NMN regarding NAD+ and rapidly dividing cells. Consult an oncologist if you have active cancer
- Quality: Niagen (ChromaDex) is the most studied branded form with the most clinical data. Generic NR products vary in quality
Natural Sources & Forms
- Niagen (branded NR): The patented form used in most clinical trials, licensed to multiple supplement brands (Tru Niagen, Life Extension, Thorne)
- Capsules: Available in 100-300 mg capsules from longevity and health supplement retailers
- Food sources: Trace amounts found in milk, yeast, and beer, but far below supplemental doses
Research Studies
Frequently Asked Questions
A form of vitamin B3 that efficiently raises NAD+ levels to support neuronal energy production, DNA repair, and neuroprotection - the first NAD+ precursor to gain widespread clinical validation.
The key benefits of Nicotinamide Riboside (NR) include: Cognitive Enhancement, Energy, Focus, Longevity, Memory, Mood.
NAD+ synthesis via NRK pathway: Converted to NMN by nicotinamide riboside kinase, then to NAD+ by NMNAT - a two-step pathway to NAD+ replenishment Sirtuin activation: Elevated NAD+ activates SIRT1 and SIRT3, supporting mitochondrial biogenesis, DNA repair, and anti-inflammatory gene expression Mitochondrial rejuvenation: Restores mitochondrial membrane potential and function in ageing cells, directly improving neuronal energy capacity Axonal protection: SIRT2 activation by NAD+ supports myelination and axonal integrity, protecting nerve signal transmission Inflammatory reduction: Reduces circulating inflammatory cytokines and C-reactive protein in human trials Blood-brain barrier penetration: Clinical evidence confirms NR reaches the central nervous system and raises brain NAD+ levels
Standard dosage: 300-1,000 mg per day Clinical trial dosage: Most human studies have used 250-1,000 mg daily Timing: Take in the morning to align with circadian NAD+ rhythms With or without food: NR is well absorbed either way, though taking with food may reduce mild gastrointestinal effects Onset: NAD+ elevation is measurable within one week. Subjective energy improvements may be noticed within 1-2 weeks. Neuroprotective benefits are long-term NR vs NMN: Both effectively raise NAD+. NR has more published human clinical data; NMN has a more direct conversion pathway. Both are considered effective
Well tolerated: Generally safe at doses up to 2,000 mg/day in clinical studies Mild side effects: Occasional nausea, headache, fatigue, or diarrhoea, typically at higher doses Flushing: Unlike niacin, NR does not cause flushing Cancer consideration: Same theoretical concern as NMN regarding NAD+ and rapidly dividing cells. Consult an oncologist if you have active cancer Quality: Niagen (ChromaDex) is the most studied branded form with the most clinical data. Generic NR products vary in quality
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