Nicotinamide Riboside

vitaminvitamin B3 form
Best in the morning

At a glance

Best for
people specifically wanting to raise NAD+ levels
Typical dose
250-500 mg/day
Time to effect
Weeks (for NAD+ rise)
Main caution
clinical benefits beyond raising NAD+ are unproven
Evidence strength: High that it raises NAD+; weak for downstream clinical outcomes

What is it

Nicotinamide riboside (NR) is a form of vitamin B3 and a direct precursor to NAD+ (nicotinamide adenine dinucleotide), a coenzyme that every cell uses for energy metabolism and many repair and signalling processes. It occurs in trace amounts in milk and is sold as a supplement, most commonly under the branded ingredient name Niagen, marketed to raise NAD+ levels, which decline with age. NR is closely related to nicotinamide mononucleotide (NMN); both feed into the same NAD+ salvage pathway.

Is it worth it for you?

Worth considering if…

  • You specifically want to raise blood NAD+ levels
  • You want a non-flushing form of vitamin B3
  • You accept that downstream benefits are unproven

Probably skip if…

  • You expect proven anti-aging or disease prevention
  • You are pregnant or breastfeeding
  • You are undergoing cancer treatment without oncologist input

Evidence at a glance

GoalEvidenceEffectBest fitTime
raising NAD+ levelsGoodDose-dependent increase in blood NAD+Adults wanting to increase NAD+, which declines with ageWeeks
metabolic health and insulin sensitivityMixedModest and inconsistentNot clearly established; studied in metabolically at-risk adultsWeeks to months

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

raising NAD+ levels

Biomarker support
Good

Human RCTs consistently show oral NR raises blood NAD+ in a dose-dependent way via the NAD+ salvage pathway. This is a biomarker change, not a clinical outcome: a higher NAD+ level has not by itself been shown to produce symptom relief or disease prevention.

Effect size: Dose-dependent increase in blood NAD+
Time to effect: Weeks
Best fit: Adults wanting to increase NAD+, which declines with age

Bottom line: NR reliably raises blood NAD+, but that biomarker shift does not by itself prove a health benefit.

SourceBrakedal et al., 2022 — PubMedMartens et al., 2018 — PMC

metabolic health and insulin sensitivity

Biomarker support
Mixed

Despite reliably raising NAD+, randomized trials have shown only modest or inconsistent effects on insulin sensitivity and other metabolic measures, varying by population and dose. Higher doses raise NAD+ more without proportionally greater metabolic benefit.

Effect size: Modest and inconsistent
Time to effect: Weeks to months
Best fit: Not clearly established; studied in metabolically at-risk adults

Bottom line: Metabolic benefits are inconsistent in trials despite the NAD+ increase.

Evidence is mixed

Trials reliably raise NAD+ but report mixed effects on insulin sensitivity and metabolism.

SourceDollerup et al., 2018 — PubMed· conflicting
SourceDollerup et al., 2018 — PubMed

How it works

NAD+ is essential for converting food into cellular energy and serves as a substrate for enzymes involved in DNA repair, the stress response, and metabolic regulation, including the sirtuins and PARPs. NAD+ levels fall with age and with metabolic stress, and the central premise of NR supplementation is to replenish them. NR enters cells and is converted to nicotinamide mononucleotide by the enzyme nicotinamide riboside kinase, and then to NAD+, providing an efficient route into the NAD+ salvage pathway. Human trials consistently show that oral NR raises blood NAD+ levels in a dose-dependent way, confirming that it does what it is designed to do biochemically. Whether this translates into clinical benefits is less settled. In animal models, restoring NAD+ improves metabolic, cardiovascular, and neurological measures. In people, randomised trials have reliably demonstrated the NAD+ increase but have shown only modest or inconsistent effects on outcomes such as insulin sensitivity, physical performance, blood pressure, and inflammation, with results varying by population and dose.

How to take it

Typical dose
250-500 mg/day
Higher studied dose
Up to 1000-2000 mg/day in short-term studies
Timing
Once daily, often in the morning (no strong evidence morning is superior)
With food
With or without food
How long to try
Ongoing; benefits relate to sustained NAD+ so daily consistency matters

What to track

  • Tolerability (nausea, headache)
  • Any subjective energy change
  • Cumulative vitamin B3 intake from all sources

2 commercial forms

Nicotinamide riboside chloride (Niagen)

Orally bioavailable and reliably raises blood NAD+ in a dose-dependent manner.

The most common and best-studied commercial form, a stabilised chloride salt used in the majority of human trials.

Nicotinamide mononucleotide (NMN, related precursor)

Also raises NAD+; head-to-head superiority over NR is not established.

A closely related NAD+ precursor one step further along the salvage pathway; an alternative rather than a form of NR itself.

Safety

Common side effects

Nausea, Fatigue, Headache, Digestive upset

Who should avoid it

  • Pregnant or breastfeeding people
  • People on cancer therapy without oncologist input

Pregnancy & breastfeeding

Safety in pregnancy and breastfeeding is not established; best avoided.

Interactions

Other high-dose vitamin B3 productsMinor

Cumulative niacin-equivalent intake can become excessive

Cancer therapyMinor

Theoretical concern since NAD+ supports DNA-repair enzymes; discuss with oncologist

Food sources

FoodAmount%DV
Cow's milktrace amounts (a natural source)—
Brewer's yeastsmall amounts—
Other vitamin B3 sources (meat, fish, legumes)provide niacin and nicotinamide rather than NR specifically—

Choosing a product

Look for

  • Clearly stated NR dose in mg
  • Recognized branded ingredient (e.g., Niagen) for verified content
  • Third-party purity testing

Be skeptical of

  • Reverses aging
  • Proven to extend lifespan
  • Boosts energy as a guaranteed clinical effect

Frequently asked questions

What is the difference between NR and NMN?⌄

Both nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) are precursors that raise NAD+. NR is converted into NMN inside the cell, so NMN is one step further along the pathway. Both reliably increase NAD+ in studies; neither is clearly proven superior in humans.

Does NR cause flushing like niacin?⌄

No. Unlike nicotinic acid (the flushing form of niacin), nicotinamide riboside does not typically cause the skin flushing reaction, which is one reason it is a popular NAD+ precursor.

Does raising NAD+ actually do anything I can feel?⌄

NR reliably raises NAD+ in the blood, but human trials have shown only modest or inconsistent effects on outcomes like metabolism, blood pressure, and performance. Many people notice no obvious subjective change.

Is NR proven to slow ageing?⌄

No. The idea is based on the age-related decline of NAD+ and on animal studies. There is no human trial evidence that NR extends lifespan or healthspan in people.

What dose is typically used?⌄

Commercial products often provide 300 to 500 mg per day, and clinical studies have used 250 to 1000 mg per day (sometimes higher for short periods). More raises NAD+ further but has not shown proportionally greater benefit.

References by claim

raising NAD+ levels

  • Brakedal et al., 2022 — PubMed (2022) link
  • Martens et al., 2018 — PMC (2018) link

metabolic health and insulin sensitivity

  • Dollerup et al., 2018 — PubMed (2018) link

Track Nicotinamide Riboside with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

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Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.