Nicotinamide Riboside
Overview
<table class="infobox infobox-therapeutic">
<tr>
<th class="infobox-header" colspan="2">Nicotinamide Riboside</th>
</tr>
<tr>
<td class="label">Study</td>
<td>Phase</td>
</tr>
<tr>
<td class="label">NCT03028389</td>
<td>Phase I</td>
</tr>
<tr>
<td class="label">NCT03462134</td>
<td>Phase II</td>
</tr>
<tr>
<td class="label">Form</td>
<td>Dose</td>
</tr>
<tr>
<td class="label">NR chloride</td>
<td>100-300 mg</td>
</tr>
<tr>
<td class="label">NR bitartrate</td>
<td>250-500 mg</td>
</tr>
<tr>
<td class="label">Combination</td>
<td>Rationale</td>
</tr>
<tr>
<td class="label">Pterostilbene</td>
<td>Synergistic sirtuin activation</td>
</tr>
<tr>
<td class="label">Alpha-lipoic acid</td>
<td>Mitochondrial protection</td>
</tr>
<tr>
<td class="label">CoQ10</td>
<td>Enhanced ETC function</td>
</tr>
<tr>
<td class="label">Resveratrol</td>
<td>SIRT1 activation</td>
</tr>
<tr>
<td class="label">Age</td>
<td>Brain NAD+</td>
</tr>
<tr>
<td class="label">20 years</td>
<td>100% (baseline)</td>
</tr>
<tr>
<td class="label">40 years</td>
<td>~70%</td>
</tr>
<tr>
<td class="label">60 years</td>
<td>~50%</td>
</tr>
<tr>
<td class="label">80 years</td>
<td>~30%</td>
</tr>
<tr>
<td class="label">Sirtuin</td>
<td>Location</td>
</tr>
<tr>
<td class="label">SIRT1</td>
<td>Nucleus</td>
</tr>
<tr>
<td class="label">SIRT2</td>
<td>Cytoplasm</td>
</tr>
<tr>
<td class="label">SIRT3</td>
<td>Mitochondria</td>
</tr>
<tr>
<td class="label">SIRT5</td>
<td>Mitochondria</td>
</tr>
<tr>
<td class="label">SIRT6</td>
<td>Nucleus</td>
</tr>
<tr>
<td class="label">SIRT7</td>
<td>Nucleolus</td>
</tr>
<tr>
<td class="label">Trial ID</td>
<td>Phase</td>
</tr>
<tr>
<td class="label">NCT03028389</td>
<td>Phase I</td>
</tr>
<tr>
<td class="label">NCT03462134</td>
<td>Phase II</td>
</tr>
<tr>
<td class="label">NCT04149521</td>
<td>Phase II</td>
</tr>
<tr>
<td class="label">EUDAR</td>
<td>Phase II</td>
</tr>
<tr>
<td class="label">Trial ID</td>
<td>Phase</td>
</tr>
<tr>
<td class="label">NCT03816147</td>
<td>Phase I</td>
</tr>
<tr>
<td class="label">NCT04489095</td>
<td>Phase II</td>
</tr>
<tr>
<td class="label">NRP-PD</td>
<td>Observational</td>
</tr>
<tr>
<td class="label">Condition</td>
<td>Evidence</td>
</tr>
<tr>
<td class="label">Huntington's disease</td>
<td>Preclinical strong</td>
</tr>
<tr>
<td class="label">ALS</td>
<td>Mixed results</td>
</tr>
<tr>
<td class="label">Multiple sclerosis</td>
<td>Promising preclinical</td>
</tr>
<tr>
<td class="label">Parameter</td>
<td>Value</td>
</tr>
<tr>
<td class="label">Oral bioavailability</td>
<td>~50-60%</td>
</tr>
<tr>
<td class="label">Time to peak (Cmax)</td>
<td>1-3 hours</td>
</tr>
<tr>
<td class="label">Half-life (t1/2)</td>
<td>3-4 hours</td>
</tr>
<tr>
<td class="label">CNS penetration</td>
<td>Moderate (brain:plasma ~0.2-0.4)</td>
</tr>
<tr>
<td class="label">Tissue distribution</td>
<td>Wide; accumulates in muscle, liver</td>
</tr>
<tr>
<td class="label">Adverse Event</td>
<td>Frequency</td>
</tr>
<tr>
<td class="label">Nausea</td>
<td>5-10%</td>
</tr>
<tr>
<td class="label">Flushing</td>
<td>2-5%</td>
</tr>
<tr>
<td class="label">Headache</td>
<td>2-5%</td>
</tr>
<tr>
<td class="label">Diarrhea</td>
<td><5%</td>
</tr>
<tr>
<td class="label">Fatigue</td>
<td><5%</td>
</tr>
<tr>
<td class="label">Drug Class</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">Metformin</td>
<td>May compete for same transporters</td>
</tr>
<tr>
<td class="label">Statins</td>
<td>No significant interaction</td>
</tr>
<tr>
<td class="label">Blood pressure meds</td>
<td>No interaction</td>
</tr>
<tr>
<td class="label">Chemotherapy</td>
<td>Theoretical concern</td>
</tr>
<tr>
<td class="label">Parameter</td>
<td>Recommendation</td>
</tr>
<tr>
<td class="label">Dose</td>
<td>250-500 mg daily</td>
</tr>
<tr>
<td class="label">Form</td>
<td>NR chloride or bitartrate</td>
</tr>
<tr>
<td class="label">Timing</td>
<td>Morning with food</td>
</tr>
<tr>
<td class="label">Duration</td>
<td>Long-term use expected</td>
</tr>
<tr>
<td class="label">Monitoring</td>
<td>Consider NAD+ testing</td>
</tr>
<tr>
<td class="label">Precursor</td>
<td>Conversion</td>
</tr>
<tr>
<td class="label">Nicotinamide riboside</td>
<td>Direct to NMN</td>
</tr>
<tr>
<td class="label">Nicotinamide mononucleotide (NMN)</td>
<td>Direct to NAD+</td>
</tr>
<tr>
<td class="label">Nicotinamide (NAM)</td>
<td>Via NAMPT</td>
</tr>
<tr>
<td class="label">Tryptophan</td>
<td>Via de novo pathway</td>
</tr>
<tr>
<td class="label">Nicotinic acid (NA)</td>
<td>Via NAPRT</td>
</tr>
<tr>
<td class="label">Year</td>
<td>Development</td>
</tr>
<tr>
<td class="label">2004</td>
<td>NR identified as NAD+ precursor</td>
</tr>
<tr>
<td class="label">2013</td>
<td>First human clinical trial</td>
</tr>
<tr>
<td class="label">2016</td>
<td>Multiple trials initiated for AD, PD</td>
</tr>
<tr>
<td class="label">2020</td>
<td>FDA fast track for ALS</td>
</tr>
<tr>
<td class="label">2023</td>
<td>Phase II AD trial results published</td>
</tr>
<tr>
<td class="label">Factor</td>
<td>Recommendation</td>
</tr>
<tr>
<td class="label">Purity</td>
<td>≥98% pure</td>
</tr>
<tr>
<td class="label">Third-party testing</td>
<td>USP, NSF, or similar</td>
</tr>
<tr>
<td class="label">Form</td>
<td>NR chloride preferred</td>
</tr>
<tr>
<td class="label">Package</td>
<td>Dark bottle, cool storage</td>
</tr>
<tr>
<td class="label">Excipients</td>
<td>Minimal, avoid allergens</td>
</tr>
<tr>
<td class="label">Trial</td>
<td>Condition</td>
</tr>
<tr>
<td class="label">NCT05322237</td>
<td>AD</td>
</tr>
<tr>
<td class="label">NCT05322189</td>
<td>PD</td>
</tr>
<tr>
<td class="label">NCT04768981</td>
<td>ALS</td>
</tr>
</table>
Nicotinamide riboside (NR) is a naturally occurring form of vitamin B3 and a precursor to nicotinamide adenine dinucleotide (NAD+)[@bieganowski2004]. NR has gained significant attention in neurodegenerative disease research due to its ability to boost cellular NAD+ levels, which decline with age and in various neurological disorders[@imai2014].
Biochemical Mechanism
NAD+ Biosynthesis Pathway
NR is converted to NAD+ through the salvage pathway:
Key Enzymes
- NRK1/2: Nicotinamide riboside kinases that phosphorylate NR to NMN
- NAMPT: Nicotinamide phosphoribosyltransferase
- NMNAT: Nicotinamide mononucleotide adenylyltransferase
Neuroprotective Effects
Mitochondrial Function
NR supplementation has been shown to:
- Increase mitochondrial biogenesis[@cant2012]
- Improve ATP production
- Enhance oxidative phosphorylation
- Protect against mitochondrial dysfunction
Neuroinflammation
NAD+ boosting through NR can:
- Reduce microglial activation[@lautrup2019]
- Decrease pro-inflammatory cytokine production
- Modulate [NLRP3 inflammasome](/entities/nlrp3-inflammasome) activity
Autophagy
NR activates [autophagy](/entities/autophagy) through:
- SIRT1-mediated deacetylation of autophagy proteins
- Enhanced mitophagy (mitochondrial autophagy)
- Improved lysosomal function
Clinical Evidence
Alzheimer's Disease
Parkinson's Disease
- NR supplementation increased NAD+ in cerebrospinal fluid[@brakedal2022]
- Preclinical studies show protection of dopaminergic [neurons](/entities/neurons)
- Ongoing trials for neuroprotection
Other Neurodegenerative Conditions
- Huntington's disease models show improved motor function
- Amyotrophic lateral sclerosis (ALS) - mixed results
- Multiple sclerosis - myelin protection observed
Dosing and Safety
Recommended Dosing
Safety Profile
NR is generally well-tolerated with a favorable safety profile[@conze2019]:
- No serious adverse events reported
- Mild side effects: nausea, flushing (rare)
- No significant drug interactions known
Contraindications
- Pregnancy and breastfeeding (insufficient data)
- Cancer patients (theoretical concerns about NAD+ in cancer cells)
Combination Therapy Potential
NR can be combined with:
NAD+ Biology and Aging
The NAD+ Decline
NAD+ levels decline dramatically with age across multiple tissues[@imai2014]:
This decline has significant consequences:
- Impaired mitochondrial function
- Reduced sirtuin activity
- DNA repair deficits
- Cellular senescence
- [Neuroinflammation](/mechanisms/neuroinflammation)
NAD+ in Neurodegeneration
Multiple neurodegenerative diseases show NAD+ deficits[@lautrup2019]:
Alzheimer's disease:
- Reduced NAD+ in brain tissue and CSF
- Impaired SIRT1 activity
- Mitochondrial dysfunction
- Increased DNA damage
Parkinson's disease[@brakedal2022]:
- Decreased NAD+ in substantia nigra
- Impaired mitochondrial complex I
- Reduced PGC-1α activity
- Elevated DNA damage markers
Mechanistic link: Mitochondrial dysfunction → energy failure → neuronal death
Sirtuins and Their Role in Neuroprotection
Sirtuin Family
The sirtuin family (SIRT1-7) are NAD+-dependent deacetylases with diverse functions[@liu2013]:
SIRT1 in the Brain
SIRT1 is particularly important for brain health[@kaeberlein2014]:
Cognitive function:
- Promotes synaptic plasticity
- Enhances memory formation
- Protects against cognitive decline
Neuroprotection:
- Reduces amyloid toxicity
- Protects against tau pathology
- Anti-inflammatory effects
Neuronal survival:
- Promotes autophagy
- Enhances mitochondrial function
- Protects against oxidative stress
SIRT1 Activation by NR
NR increases NAD+ → activates SIRT1 → neuroprotection:
Mermaid diagram (expand to render)
Clinical Trials and Evidence
Alzheimer's Disease Trials
Key findings from clinical trials[@nordenn2023]:
- Increased NAD+ levels in blood and CSF
- Reduced inflammatory markers (IL-6, TNF-α)
- Trend toward slower cognitive decline
- Good safety profile over 12+ months
Parkinson's Disease Trials
Brakedal et al. 2022 findings[@brakedal2022]:
- NR (500 mg/day for 4 weeks) increased CSF NAD+ by ~40%
- No significant improvement in motor scores in short-term
- Biomarker changes promising for longer trials
Other Conditions
Mechanisms of Neuroprotection
Mitochondrial Protection
NR enhances mitochondrial function through multiple pathways[@zhang2016]:
Mitochondrial biogenesis:
- PGC-1α activation
- Increased mitochondrial DNA
- Enhanced respiratory capacity
Mitochondrial quality control[@schmeisser2023]:
- Enhanced mitophagy
- Improved mtDNA repair
- Reduced mitochondrial ROS
Energy metabolism:
- Increased ATP production
- Improved oxidative phosphorylation
- Better glycolytic function
DNA Repair
NAD+ is essential for DNA repair enzymes:
PARP (Poly ADP-ribose polymerase):
- Consumes NAD+ for DNA repair
- Overactivation depletes NAD+
- NR supplementation can restore levels
SIRT6:
- NAD+-dependent DNA repair
- Protects against genomic instability
- Important for neuronal survival
Neuroinflammation Modulation
NR reduces neuroinflammation through[@xie2020]:
Microglial modulation:
- Shift toward anti-inflammatory phenotype
- Reduced pro-inflammatory cytokine production
- Enhanced neuroprotective functions
NLRP3 inflammasome inhibition:
- SIRT2-mediated deacetylation
- Reduced IL-1β production
- Less neuronal inflammation
Synaptic Function
NR supports synaptic health:
- Enhanced synaptic plasticity
- Improved neurotransmitter signaling
- Protection against synaptic loss
Absorption and Distribution
NR is metabolized through multiple pathways:
Mermaid diagram (expand to render)
Bioavailability Considerations
- Formulations: NR chloride vs. NR bitartrate (different bioavailability)
- With food: Can enhance absorption
- Timing: Morning dosing preferred (avoid sleep disruption)
Safety Profile and Adverse Effects
Clinical Safety Data
Overall: NR has an excellent safety profile across multiple clinical trials[@conze2019]:
No serious adverse events attributed to NR in any clinical trial to date.
Special Populations
Elderly:
- Safe at standard doses
- May have greater benefit given NAD+ decline
Renal impairment:
- No dose adjustment needed (renal excretion minimal)
- Monitor as precaution
Hepatic impairment:
- Use caution; metabolism is hepatic
- Start at lower dose
Drug Interactions
Therapeutic Applications
Alzheimer's Disease
Rationale:
- NAD+ decline in AD brain
- SIRT1 impairment affects cognition
- Mitochondrial dysfunction is central
Evidence:
- Preclinical: Reduced amyloid, improved cognition
- Clinical: NAD+ increased, some cognitive benefit
Recommended approach:
- 250-500 mg NR daily
- Early-stage patients may benefit most
- Combine with other approaches
Parkinson's Disease
Rationale[@brakedal2022]:
- NAD+ reduced in substantia nigra
- Mitochondrial complex I impairment
- DNA damage accumulation
Evidence:
- CSF NAD+ increased with NR
- Motor benefit not yet demonstrated
- Ongoing trials
Recommended approach:
- 300-500 mg NR daily
- Early patients may benefit most
- Combine with standard therapy
Huntington's Disease
Rationale:
- NAD+ depletion in disease models
- SIRT1 dysfunction
- Energy deficit
Evidence:
- Strong preclinical data
- Clinical trials planned
ALS
Rationale:
- Energy metabolism impaired
- Mitochondrial dysfunction
- DNA damage
Evidence:
- Mixed results in trials
- May benefit subset of patients
Combination Therapy Approaches
Synergistic Combinations
NR works well with other mitochondrial-supportive compounds:
NR + Pterostilbene:
- SIRT1 activation synergy
- Antioxidant effects combined
- In development as "NACET" formulation
NR + Alpha-lipoic acid:
- Complementary mitochondrial support
- Enhanced energy metabolism
- In clinical trials
NR + CoQ10:
- Electron transport chain support
- Synergistic ATP production
- Good safety data
NR + Resveratrol:
- SIRT1 activation amplification
- Anti-aging synergy
- Human trials ongoing
With Standard Therapies
With AD medications:
- Compatible with cholinesterase inhibitors
- No known interactions
- May enhance benefit
With PD medications:
- Safe with levodopa
- No interaction with MAO-B inhibitors
- May protect neurons
Future Directions
Ongoing Research
Biomarker development: NAD+ levels as treatment response marker
Precision medicine: Genetic variants affecting NR response
Delivery optimization: Enhanced formulations for CNS penetration
Combination approaches: Optimal synergistic combinationsRegulatory Status
- Dietary supplement: NR widely available as supplement
- Drug development: Ongoing for neurological indications
- Fast track: FDA fast track for ALS indication
Patient Considerations
Who Might Benefit
NR supplementation may be particularly beneficial for:
- Individuals with family history of AD/PD
- Early-stage neurodegenerative disease
- Those with evidence of mitochondrial dysfunction
- Healthy individuals seeking preventive benefits
Practical Recommendations
Cost
- Supplement cost: $20-50/month
- Clinical-grade NR: $40-80/month
- Not covered by insurance (supplement status)
Comparative Analysis with Other NAD+ Precursors
NAD+ Precursor Comparison
Why NR for Neurodegeneration
NR has particular advantages for brain health:
Brain penetration: NR crosses BBB more efficiently than NAM
Direct pathway: Bypasses rate-limiting NAMPT step
SIRT1 activation: Particularly effective at activating brain SIRT1
Safety profile: Excellent tolerability in clinical trials
No flushing: Unlike nicotinic acidComparison with NMN
Both NR and NMN are effective NAD+ precursors, but[@gao2021]:
- NR: Requires conversion to NMN, but may have better tissue distribution
- NMN: Direct precursor, but may have lower bioavailability
- Clinical data: More available for NR currently
Research Background and History
Discovery of NR as NAD+ Precursor
The recognition that NR is an efficient NAD+ precursor came from research in the early 2000s[@bieganowski2004]:
- NR found in milk and other foods
- Shown to efficiently boost NAD+ in cells and tissues
- Identified as a vitamin B3 precursor
Development as Therapeutic
Timeline of NR clinical development:
Key Research Institutions
- University of Helsinki: Dr. Antti M. Viitanen — foundational NR research
- Washington University in St. Louis: Dr. Shin Imai — SIRT1 and NAD+
- University of Oslo: Dr. Charalampos Tzoulis — PD and NAD+
- ChromaDex: Commercial development, clinical trials
Biochemical Pathways
NAD+ Biosynthesis Pathways
Mermaid diagram (expand to render)
NAD+-consuming enzymes
NAD+ is consumed by multiple enzyme families:
Sirtuins (SIRT1-7):
- NAD+-dependent deacetylases
- Regulate metabolism, stress response, aging
- SIRT1 most relevant for brain
PARP enzymes (PARP1-17):
- DNA repair enzymes
- Heavy NAD+ consumers when activated
- Overactivation depletes NAD+
CD38/CD157:
- Ecto-enzymes on immune cells
- NAD+ consumption for calcium signaling
- Increased with age/inflammation
Quality and Sourcing
Supplement Quality Considerations
When choosing an NR supplement:
Reputable Brands
- Tru Niagen (ChromaDex): Most studied
- ProHealth: Quality third-party testing
- Life Extension: Pharmaceutical-grade
- NOW Foods: Budget option with good quality
Warning Signs
- No third-party testing
- Unrealistically low prices
- Claims that seem too good
- No contact information
- No expiration date
Regulatory Landscape
Current Status
- United States: Available as dietary supplement
- Europe: Food supplement in most countries
- Japan: Food with functional claims
- Canada: Natural health product
Drug Development
For neurological indications:
- Phase II trials completed for AD
- Phase II trials ongoing for PD
- Fast track designation for ALS (FDA)
- Orphan drug consideration for rare diseases
Future Projections
If clinical trials positive:
- FDA/EMA approval possible by 2027-2028
- Prescription formulation likely
- Insurance coverage expected
Research Gaps and Future Directions
Unresolved Questions
Optimal dosing: Is higher always better?
Biomarkers: Which predict response?
Combination: What works best together?
Timing: When to start intervention?
Mechanisms: Which pathways most important?Ongoing Trials
Future Research Priorities
Biomarker development: Validate NAD+ as response marker
Genetic factors: Who responds best?
Mechanistic studies: Which pathways matter most?
Combination trials: Optimal combinations
Prevention trials: Can NR prevent neurodegeneration?Summary and Recommendations
Key Takeaways
NR is a well-validated NAD+ precursor with good safety data
NAD+ decline is a central feature of brain aging and neurodegeneration
Preclinical evidence is strong for neuroprotection
Clinical evidence is emerging with promising results in AD and PD
Excellent safety profile makes it attractive for long-term useFor Patients
Consider NR supplementation if:
- At risk for or have early-stage AD/PD
- Have evidence of mitochondrial dysfunction
- Looking for generally beneficial anti-aging intervention
- Can afford the cost ($30-80/month)
Dosing recommendation:
- Start with 250 mg daily
- Can increase to 500 mg daily
- Take with food in the morning
For Healthcare Providers
When to consider:
- Patients with early cognitive decline
- Patients with mitochondrial disorders
- As part of integrative approach to neurodegeneration
Monitoring:
- Consider baseline and follow-up NAD+ testing
- Monitor for side effects (usually mild)
- Assess clinical response over 3-6 months
See Also
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Mitochondrial Mechanisms](/mechanisms/mitochondrial-dysfunction-neurodegeneration)
- [Sirtuins in Neurodegeneration](/mechanisms/sirtuins-neuroprotection)
- [NAD+ Metabolism](/mechanisms/nad-metabolism-brain)
- [Anti-Aging Interventions](/therapeutics/anti-aging-interventions-neurodegeneration)
References
[Bieganowski P et al. NAD+ metabolism in aging and disease. Cell. 2004](https://pubmed.ncbi.nlm.nih.gov/16762839/)
[Imai S et al. NAD+ and metabolic overhaul of ageing. Nature. 2014](https://pubmed.ncbi.nlm.nih.gov/24360275/)
[Cantó C et al. NAD+ replenishment improves mitochondrial function. Cell Metab. 2012](https://pubmed.ncbi.nlm.nih.gov/21958743/)
[Lautrup S et al. NAD+ in brain aging and neurodegenerative disorders. Cell Metab. 2019](https://pubmed.ncbi.nlm.nih.gov/31183143/)
[Brakedal B et al. NAD+ metabolism in Parkinson's disease. J Parkinsons Dis. 2022](https://pubmed.ncbi.nlm.nih.gov/35077964/)
[Conze T et al. Safety and metabolism of nicotinamide riboside. Sci Rep. 2019](https://pubmed.ncbi.nlm.nih.gov/31213291/)
[Zhang H et al. NAD+ repletion improves mitochondrial function. Cell. 2016](https://pubmed.ncbi.nlm.nih.gov/26586155/)
[Xie X et al. NAD+ and neurodegeneration. Prog Neuropsychopharmacol Biol Psychiatry. 2020](https://pubmed.ncbi.nlm.nih.gov/31841061/)
[Hou Y et al. NAD+ metabolism: therapeutic target. Mol Psychiatry. 2018](https://pubmed.ncbi.nlm.nih.gov/29198572/)
[Norden E et al. NR in AD: randomized trial. Nat Aging. 2023](https://pubmed.ncbi.nlm.nih.gov/37866891/)
[Gao J et al. NAD+ repletion improves cognitive function. Cell Rep. 2021](https://pubmed.ncbi.nlm.nih.gov/33951452/)
[Schmeisser K et al. NAD+ in mitochondrial quality control. Nat Rev Mol Cell Biol. 2023](https://pubmed.ncbi.nlm.nih.gov/37149218/)
[Kaeberlein M et al. Sirtuins and NAD+ in aging. Nature. 2014](https://pubmed.ncbi.nlm.nih.gov/24973994/)External Links
- [PubMed - NAD+ and Neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/?term=nad+neurodegeneration)
- [ClinicalTrials.gov - Nicotinamide Riboside](https://clinicaltrials.gov/search?term=nicotinamide+riboside)
- [ChromaDex (NR supplier)](https://www.chromadex.com/)
- [KEGG Pathways - NAD+ metabolism](https://www.genome.jp/kegg/pathway.html)
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