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Nicotinamide Riboside (NR) supplement
NAD+ Precursor / Longevity

Nicotinamide Riboside (NR): Benefits, Dosage, Forms & Research

NAD+ Precursor / Longevity

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

TL;DR — Quick Answer

Nicotinamide riboside (NR) is a NAD+ precursor with the most human clinical trial data of any NAD+ booster. Doses of 300-1000mg/day reliably increase blood NAD+ by 40-90%. The CHROMAVITA trial confirmed safety and efficacy at 1000mg/day for 8 weeks.

Key Facts

What it is
A vitamin B3 form that serves as a biosynthetic precursor to NAD+
Primary benefits
  • Raises cellular NAD+ levels by 40-90%
  • Most extensively studied NAD+ precursor in humans
  • Supports mitochondrial function
  • May reduce inflammation (NLRP3 inflammasome)
  • Supports healthy aging and cellular repair
Typical dosage
300-1000mg daily
Evidence level
Moderate
Safety profile
Generally Safe

What the Research Says

NR has the most robust human safety dataset of any NAD+ precursor. Martens et al. (2018) published a landmark crossover RCT showing 1000mg NR daily safely elevated NAD+ by ~60% in healthy older adults. Elhassan et al. (2019) confirmed NAD+ elevation in skeletal muscle and demonstrated anti-inflammatory effects. Trammell et al. (2016) established the pharmacokinetics of oral NR in humans. ChromaDex's Niagen has received FDA GRAS (Generally Recognized as Safe) status and two FDA new dietary ingredient notifications. The NR vs NMN debate remains active — NR has more published human data, while NMN is one enzymatic step closer to NAD+.

Benefits of Nicotinamide Riboside (NR)

  • NAD+ elevation — Martens et al. (2018) demonstrated that 1000mg NR daily for 6 weeks increased NAD+ levels by approximately 60% in healthy older adults in a crossover RCT
  • Anti-inflammatory effects — Elhassan et al. (2019) found NR supplementation reduced circulating inflammatory cytokines and NLRP3 inflammasome activation in aged human skeletal muscle
  • Cardiovascular support — Martens et al. (2018) observed a trend toward reduced systolic blood pressure and aortic stiffness in older adults taking NR, though the study was not powered for these endpoints
  • Mitochondrial function — NR restores NAD+ availability for mitochondrial complex I, supporting electron transport chain efficiency and ATP production in aging tissues
  • Neuroprotection — preclinical studies show NR delays neurodegeneration in Alzheimer's and Parkinson's models; human trials for cognitive outcomes are ongoing
Did you know?

NR has the most robust human safety dataset of any NAD+ precursor.

Forms of Nicotinamide Riboside (NR)

FormBioavailabilityBest For
Nicotinamide Riboside Chloride (Niagen)Moderate-HighStandard supplementation — the patented form used in most clinical trials with extensive safety data
NR Capsules (generic)ModerateCost-effective option — non-branded NR at lower price points

Dosage Recommendations

General recommendation: 300-1000mg daily, taken in the morning

Timing: Morning; may cause mild insomnia if taken late in the day

Dosage by Condition

ConditionRecommended DoseEvidence
General NAD+ support300mg dailyModerate
Anti-aging / longevity500-1000mg dailyEmerging
Cardiovascular support1000mg dailyEmerging

Upper limit: 2000mg/day (doses up to 2000mg have been tested safely in short-term trials)

Side Effects and Safety

Safety profile: Generally Safe

Potential Side Effects

  • Generally well-tolerated up to 2000mg/day in clinical trials
  • Mild nausea, fatigue, and headache reported infrequently
  • Flushing is rare (unlike niacin, NR does not typically cause flushing)
  • Mild GI discomfort at higher doses

Drug & Supplement Interactions

  • No significant drug interactions identified in clinical trials
  • Theoretical concern with chemotherapy — NAD+ supports DNA repair in all cells; consult oncologist
  • May have additive effects with other NAD+ precursors (NMN, niacin)
Check Nicotinamide Riboside (NR) interactions with other supplements →
BenefitsDosage GuideSide EffectsTypes & FormsResearchFAQ

Related Conditions

Longevity & Healthy Aging

Related Supplements

NMNCoenzyme Q10 (CoQ10)Resveratrol

Frequently Asked Questions

Is NR better than NMN?

Neither is definitively superior. NR has more published human clinical trials and FDA GRAS status, giving it a stronger safety profile. NMN is one enzymatic step closer to NAD+ in the biosynthesis pathway. Both reliably raise NAD+ levels in humans. Head-to-head comparisons are limited, and many researchers consider them roughly equivalent for practical purposes.

Does NR cause flushing like niacin?

No. Unlike niacin (nicotinic acid), NR does not activate the GPR109A receptor responsible for the uncomfortable flushing response. This is one of the key advantages of NR over traditional niacin for raising NAD+ levels.

How long does NR take to raise NAD+ levels?

Blood NAD+ levels begin rising within hours of the first dose and reach significantly elevated levels within 1-2 weeks of daily supplementation. Trammell et al. (2016) showed dose-dependent NAD+ increases within 24 hours of a single oral dose. Sustained benefits for aging-related outcomes likely require months of consistent use.

References

  1. (). Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nature Communications. DOI
  2. (). Nicotinamide riboside augments the aged human skeletal muscle NAD+ metabolome and induces transcriptomic and anti-inflammatory signatures. Cell Reports. DOI
  3. (). Nicotinamide riboside is uniquely and orally bioavailable in mice and humans. Nature Communications. DOI