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Medically reviewed by Vanessa Niles, R.N., M.D., F.A.C.O.G. —
Definition
Nicotinamide riboside, in plain English
NR is a nicotinamide molecule joined to a ribose sugar. NIH's Office of Dietary Supplements notes that NR is sold as a dietary supplement but isn't marketed or labeled as a source of niacin.
Inside cells, enzymes called NR kinases add a phosphate group to NR to make NMN, which is then converted to NAD+.
- Short name
- NR
- Form
- Oral dietary supplement
- Becomes
- NMN, then NAD+
How it connects
How nicotinamide riboside relates to NAD+
In a 2018 randomized crossover trial in healthy middle-aged and older adults, six weeks of NR was well tolerated and raised NAD+ levels in blood cells (Martens et al., Nature Communications).
For your treatment
What nicotinamide riboside means for NAD+ therapy
NR is taken by mouth, while NADMedics prescribes NAD+ itself as a nasal spray or injection. The two haven't been compared directly in trials, and long-term benefits of either are unproven.
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Questions
Nicotinamide riboside: common questions
What is nicotinamide riboside?
Nicotinamide riboside (NR) is a form of vitamin B3 sold as a dietary supplement. The body converts it to NMN and then to NAD+, and small human trials show it can raise NAD+ levels.
Is NR better than NAD+ injections?
No one knows. They haven't been compared head to head, and long-term outcomes for both are unproven.
Is NR safe?
Short trials in healthy adults have found it well tolerated, but long-term safety data are limited. Ask your provider before combining it with NAD+ therapy.
Can I take precursors with NAD+ therapy?
Combining them hasn't been studied. Tell your provider about any NR, NMN, niacin or other supplements before you start.
Can I get enough NAD+ from food?
Food supplies niacin and tryptophan, which your body turns into NAD+, and NIH says most people in the U.S. get enough niacin. NAD+ in food is largely broken down during digestion.
Do precursors and NAD+ therapy do the same thing?
Both aim to raise NAD+, by different routes: precursors are converted by the body, while spray and injections deliver NAD+ itself. They haven't been compared in trials.
Keep learning
Related NAD+ terms
Terms that connect to nicotinamide riboside, each explained on its own page.
- Vitamins & precursorsNicotinamide mononucleotideNicotinamide mononucleotide (NMN) is the molecule one step before NAD+. The body makes it from nicotinamide or NR, and it's studied, and sold, as a way to raise NAD+.
- Vitamins & precursorsNAD+ precursorAn NAD+ precursor is any molecule the body can turn into NAD+. The main ones are tryptophan, nicotinic acid, nicotinamide, nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN).
- Enzymes & pathwaysNAD+ salvage pathwayThe NAD+ salvage pathway recycles nicotinamide, which is released whenever enzymes use NAD+, back into NAD+. It's the main way most human cells keep their NAD+ supply topped up.
- Treatment & safetyBioavailabilityBioavailability is how much of a medicine, and how fast, reaches the bloodstream or the place where it acts. It differs by route: IV, injection, nasal spray or by mouth.
Guides that cover nicotinamide riboside
- What Is NAD Injections? A Simple, Friendly Beginner's GuideNew to NAD+ injections? Learn what they are, how a shot under the skin works, what research shows, who should skip them and what they cost at NADMedics.NAD+ injections
- NAD Nasal Spray vs Pill: Which Option Truly Works Better?NAD+ nasal spray vs pills: compare oral NAD+, NADH, NR and NMN with prescription spray, what human trials show for each and the costs and trade-offs.NAD+ nasal spray
Official sources
Nicotinamide riboside: sources and official resources
Official government and research sources behind this page, so you can check the facts yourself.
- NIH Office of Dietary SupplementsNiacin: Health Professional Fact Sheet
Explains how the body turns niacin (vitamin B3) into NAD, a coenzyme used by more than 400 enzymes.
- NIH PubMed CentralMartens et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults (2018)
Randomized crossover trial of oral NR in healthy adults.
- NIH PubMed CentralCovarrubias et al. NAD+ metabolism and its roles in cellular processes during ageing (2021)
Review of how NAD+ works in cells and how levels change with age.
- NIH PubMedNAD+ therapy in age-related degenerative disorders: a benefit/risk analysis (2020)
Weighs early promise against the lack of long-term human trials.
Medically reviewed by Dr. Vanessa Niles, R.N., M.D., F.A.C.O.G., on October 12, 2026. This glossary is general education, not medical advice. NAD+ has no FDA-approved use, and compounded NAD+ is not FDA-approved or evaluated by the FDA for safety or effectiveness. Talk with a licensed provider before starting any supplement or treatment.
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