NAD+ Blood Tests: What the Number Shows, What It Can’t, and Why There Is No Agreed Normal Range
At-home NAD+ tests promise to show whether your “cellular energy” is low and whether NMN or NR is working. They can show whether NMN or NR raises your blood NAD+, which is not the same as showing it works. Here is what the test measures, why results depend on the sample and the lab method, and why a higher number has not yet been shown to mean better health.
By Kymata Health Editorial Published Last checked
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Key takeaways
From 8 sources- An NAD+ test measures a molecule that is chemically unstable and behaves differently in whole blood, plasma and other samples, so results depend heavily on the lab method3.
- NMN and NR reliably raise blood NAD+: whole-blood NAD+ doubled in one NR study, rose 2.6-fold in another, and climbed at NMN doses of 300 to 900 mg a day465.
- A higher number has not translated into clear health gains: across 8 NMN trials (342 adults), fasting glucose, insulin, HbA1c and lipids did not improve7.
- The idea that NAD+ falls steadily with age is weaker in humans than the marketing suggests; a 2021 review called the human evidence very limited1.
- For niacin deficiency itself, NIH says blood niacin levels are not reliable and points to urine metabolites or the ratio of NAD to NADP instead8.
What this article covers
2 evidence profilesThe evidence, graded
Pulled from the trial tables in our evidence profiles. Grades follow our evidence-grading policy.
Graded findings
3 rows- CGrade CBlood NAD and six-minute walking distanceImproved Blood NAD rose in all NMN groups versus placebo. Six-minute walking distance increased more with all doses than placebo, most with 600 and 900 mg. HOMA-IR did not differ from placebo, and NMN was well tolerated.NMN (nicotinamide mononucleotide) · RCT · n=80 · 2023 · PMID 36482258
- CGrade CBlood NAD+ levelsImproved Blood NAD+ rose 2.6-fold with NR, with no between-group difference in adverse events. Cognition scores (MoCA) did not change.Nicotinamide riboside (NR) · RCT · n=20 · 2024 · PMID 37994989
- CGrade CFasting glucose, insulin, HbA1c and lipidsNo effect NMN showed no significant benefit on fasting glucose, fasting insulin, HbA1c, HOMA-IR or the lipid profile.NMN (nicotinamide mononucleotide) · Meta-analysis · n=342 · 2024 · PMID 39531138
Safety at a glance
From our NMN (nicotinamide mononucleotide) evidence profilePublished interactions and cautions only. Each one is cited on our NMN (nicotinamide mononucleotide) evidence profile, with its own numbered sources.
Who should be careful
- Long-term use
- Trials lasted 24 weeks at most; long-term safety has not been established.
- Pregnancy and breastfeeding
- No NMN trial in our sources enrolled pregnant or breastfeeding women. EFSA's 2026 safety opinion excluded them, and noted effects on reproductive organs in a 90-day rat study (no-effect level 400 mg/kg body weight a day).
- Children
- Human trials enrolled adults only, and EFSA's safety conclusion covers adults.
- Regulatory note
- FDA's acknowledgement of an NMN notification is procedural and is not a finding that NMN or products containing it are safe.
What an NAD+ blood test actually measures
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme cells use to run energy metabolism and enzymes such as sirtuins and PARPs2. Tests sold to consumers report NAD+ either inside blood cells (from whole blood) or in plasma, the liquid part of blood, and the two are not the same measurement.
Getting a reliable number is hard. A 2021 review of NAD measurement methods notes that most of these molecules oxidize on their own and differ in stability from one sample type to another, which makes accurate measurement an analytical challenge3. Cheaper colorimetric enzyme kits and HPLC-UV methods lack the specificity and sensitivity needed for human samples, and the authors favor liquid chromatography-mass spectrometry3.
In practice, that means two labs can give different numbers for the same person, and a single result means little without knowing the sample, the method and the lab’s own comparison range.
Does NAD+ really fall with age?
Some human data say yes. An Australian study measured the plasma NAD+ metabolome in healthy adults aged 20 to 87 and found plasma NAD+ and NADP+ were lower in older people, while NADH, nicotinamide and N-methyl-nicotinamide were higher2.
But a 2021 review of studies across yeast, worms, rodents, monkeys and humans concluded that, despite systematic claims, the evidence for an overall age-related NAD+ decline is very limited and often comes from a single tissue or cell type1. The authors said this is particularly true in humans, where NAD+ levels across aging are still poorly characterized, and called for larger, preferably longitudinal studies1.
So when a test report flags your result as low for your age, the comparison behind that flag rests on thin and mostly cross-sectional data.
Supplements raise the number. That part is solid
Every trial we reviewed that measured blood NAD+ after NMN or nicotinamide riboside (NR) found it went up:
- NR, open-label study: in 8 healthy volunteers taking up to 1,000 mg twice daily, whole-blood NAD+ rose by 100% at steady state4.
- NR, pilot trial: in 20 older adults with mild cognitive impairment, NR escalated to 1 g a day for 10 weeks raised blood NAD+ 2.6-fold, but cognition scores did not change6. ChromaDex, which sells NR, supplied the NR and placebo, and one co-author is ChromaDex’s chief scientific adviser and a stockholder, though the paper says he was not involved in study design or execution6.
- NMN, dose-finding trial: in 80 healthy middle-aged adults, 300, 600 or 900 mg a day for 60 days raised blood NAD+ versus placebo, highest at 600 and 900 mg5. Walking distance improved, while insulin resistance did not differ from placebo5. The paper’s conflict-of-interest statement lists the first author as an Abinopharm employee and two co-authors as Aba Chemicals employees5.
What the number can’t tell you
A rise on the test shows the product is absorbed and converted. It does not show that anything else improved. A 2024 meta-analysis of 8 randomized NMN trials, using 250 to 2,000 mg a day for 14 days to 12 weeks, found no significant benefit on fasting glucose, fasting insulin, HbA1c, insulin resistance or blood lipids7. We found no clinical guideline that sets a target NAD+ level.
The test is also not how niacin (vitamin B3) deficiency is diagnosed. NIH says blood niacin levels are not reliable indicators; the most sensitive measure is urinary excretion of two niacin breakdown products, with less than 5.8 micromol a day indicating deficiency and more than 17.5 micromol a day adequate status8. NIH also lists a whole-blood ratio of NAD to NADP: a “niacin number” below 130 suggests deficiency8. Low red-cell NAD appears in NIH’s list only as an early sign of inadequacy, alongside urine markers, not as a stand-alone test8.
If you test anyway
A before-and-after test can answer one narrow question: is this product raising NAD+ in my blood? To get a usable answer:
- Use the same lab and the same sample type both times, because NAD+ behaves differently across sample types and methods3.
- Test before you start and again on a steady dose; the NMN trial saw clear rises by day 30 and day 605.
- Read a “low” flag as a lab-specific comparison, not a diagnosis, since human age data are limited1.
- Plain niacin is a different product with an adult upper limit of 35 mg a day8. Our NMN evidence review and NMN vs NR comparison cover what the precursors have and have not done.
- Ordering your own labs? Our blood-testing hub compares services, and our guide to ordering your own blood work covers what a direct-to-consumer panel can and cannot replace.
- If you are pregnant, breastfeeding or managing a medical condition, talk to a clinician first: the trials above were small and lasted weeks, not years56.
Quick answers
Common questions
4 answersWhat is a normal NAD+ level?
Do NMN or NR raise NAD+ in the blood?
If my NAD+ goes up, will I feel or get healthier?
Can an NAD+ test diagnose niacin deficiency?
Not on its own. NIH points to urinary niacin metabolites, or the whole-blood NAD-to-NADP ratio, as the measures of niacin status8.
Keep reading
Full evidence profiles
Every graded study, studied doses, interactions and safetyRelated articles
4 articles- ArticleBest NMN Supplement? What the Label Can and Can't Tell YouWhat is the best NMN supplement, and what should I look for on the label?
- ArticleDoes NMN Work? It Raises NAD, but Pooled Trials Find Little Else So FarDoes NMN really work?
- ArticleIs NMN Legal in the US? FDA Reversed Its 2022 Position on September 29, 2025Is NMN legal to sell as a supplement in the US?
- ArticleNicotinamide Riboside Benefits: Higher NAD+, One Walking Result, No Metabolic GainsWhat are the benefits of nicotinamide riboside?
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References
8 sources. Numbers in the text link here.
Sources cited in this article
8 sources- 1Age-Dependent Decline of NAD+: Universal Truth or Confounded Consensus?Nutrients, 2021 · PMID 35010977
- 2The Plasma NAD+ Metabolome Is Dysregulated in “Normal” AgingRejuvenation Res, 2019 · PMID 30124109
- 3NADomics: Measuring NAD+ and Related Metabolites Using Liquid Chromatography Mass SpectrometryLife (Basel), 2021 · PMID 34073099
- 4An open-label, non-randomized study of the pharmacokinetics of the nutritional supplement nicotinamide riboside (NR) and its effects on blood NAD+ levels in healthy volunteersPLoS One, 2017 · PMID 29211728
- 5The efficacy and safety of β-nicotinamide mononucleotide (NMN) supplementation in healthy middle-aged adults: a randomized, multicenter, double-blind, placebo-controlled, parallel-group, dose-dependent clinical trialGeroScience, 2023 · PMID 36482258
- 6A randomized placebo-controlled trial of nicotinamide riboside in older adults with mild cognitive impairmentGeroScience, 2024 · PMID 37994989
- 7Effects of Nicotinamide Mononucleotide on Glucose and Lipid Metabolism in Adults: A Systematic Review and Meta-analysis of Randomised Controlled TrialsCurr Diab Rep, 2024 · PMID 39531138
- 8Niacin: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2022
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