NMN vs NR (2026): Which to Buy, and What Studies Show
Buy NMN: Transparent Labs NMN 600 mg. In the only trial we found that compared the two in people, NMN and NR raised blood NAD+ about the same over 14 days. Neither has shown clear health benefits. So we pick on the product: 600 mg of NMN for $1.00 a capsule at list price, on Informed Choice.
Our pick
Transparent Labs NMN 600 mg
- Cost
- $1.00 a capsule (600 mg), list price
- Testing
- Informed Choice
Want an outside check of the label? Buy NR. Both NR products here are on NSF Certified for Sport, which checks label claims as well as banned substances. Our NMN pick’s list, Informed Choice, tests for substances banned in sport; we found nothing saying it checks how much NMN is in the capsule. See who should buy which.
What the one head-to-head trial found
Both NMN and NR are forms of vitamin B3 that the body can turn into NAD+. We found only one trial that compared them in people. In it, 65 healthy adults took NR, NMN or nicotinamide (another form of B3) for 14 days. NR and NMN “comparably” raised NAD+ in the blood; nicotinamide did not (Christen 2026).
- The only result in people was NAD+ in the blood. That is a lab number, not a health result.
- It was short and open-label: 14 days, and people knew what they took.
- It was run by a company: the authors work for Nestlé Research and Nestlé Health Science.
We found no trial comparing NMN and NR on strength, sleep, blood sugar or any other health outcome.
What studies found for health
Not much, for either. A 2026 review of 33 human studies found NR and NMN “consistently” raised NAD+ markers and were well tolerated, but effects on health were “often null” (Gallagher 2026). A 2025 review found no support for either one to keep muscle and strength in adults over 60 (Prokopidis 2025). For NMN alone, a 2026 review of 15 trials found no broad metabolic benefit, such as for blood sugar or weight (Yang 2026). See the NMN studies.
Legal status in the US
- NMN: in 2022 FDA said NMN was excluded from the dietary supplement definition, because it had first been studied as a drug. FDA said on September 29, 2025 that NMN is not excluded from the dietary supplement definition. Makers still have to notify FDA, and FDA’s acceptance of a notification is not a safety finding (FDA calls it “a procedural matter”).
- NR: on August 3, 2016, FDA answered ChromaDex’s GRAS notice (GRN 635) on NR as a vitamin B3 source in some foods and drinks. FDA said it had “no questions at this time” and “has not, however, made its own determination.” That letter is about foods and drinks, not a safety finding for NR supplements. We did not check NR’s supplement filings.
- Neither is FDA approved.
Safety
Short trials of both found them well tolerated (Gallagher 2026). For NMN, no trial we read reported serious side effects, and none we found ran longer than 24 weeks. If you are pregnant or breastfeeding, have or had cancer, or take any medicine, talk to your doctor first. See the NMN cautions.
Who should buy which
- Most people who want one: Transparent Labs NMN 600 mg. 600 mg of NMN for $1.00 a capsule at list price, on Informed Choice (checked September 22, 2026). It has the top score of the 11 NMN products we score. 600 mg is the short-term amount in NMN makers’ FDA filings (up to about 2 months; one filing names 300 mg for ongoing use). See the best NMN, scored.
- You want NR with a label check: Tru Niagen 300 mg. 300 mg of NR a capsule, on NSF Certified for Sport.
Questions
Is NMN better than NR?
No trial shows that. The only trial we found that compared them in people found both raised blood NAD+ about the same over 14 days (Christen 2026). It did not test health results. We pick NMN because our top NMN product, Transparent Labs NMN 600 mg, is on a testing list and costs $1.00 a capsule at list price.
Which is safer, NMN or NR?
We cannot say. Both were well tolerated in short trials (Gallagher 2026), and neither is FDA approved. For NMN, no trial we read reported serious side effects, but none we found ran longer than 24 weeks.
What is NMN’s legal status in the US?
FDA said on September 29, 2025 that NMN is not excluded from the dietary supplement definition, reversing its 2022 position. Makers still have to notify FDA, and FDA’s acceptance of a notification is not a safety finding.
Do NMN or NR slow aging?
Not shown in people. A 2026 review of 33 human studies found both raise NAD+ markers, but results on health were mixed and often null; it calls the case for aging or wellness “inconclusive” (Gallagher 2026).
Sources
- Christen, et al. (NR vs NMN vs nicotinamide, 14 days). Nat Metab. 2026. PubMed 41540253 (authors from Nestlé)
- Gallagher, et al. (review of 33 human studies of NAD+ precursors). Ageing Res Rev. 2026. PubMed 41655607. Prokopidis, et al. (muscle meta-analysis). J Cachexia Sarcopenia Muscle. 2025. PubMed 40275690. Yang, et al. (meta-analysis of 15 NMN trials). Nutrients. 2026. PubMed 42514320
- US FDA. Agency response letter, GRAS notice GRN 000635 (nicotinamide riboside chloride), August 3, 2016. fda.gov
- US FDA. Response to citizen petition FDA-2023-P-0872, September 29, 2025. regulations.gov FDA-2023-P-0872-2754
- Testing: Informed Choice list; NSF Certified for Sport listings 1473227 (Tru Niagen) and 1423140 (NiaCel). Prices: the brand’s own list price for Transparent Labs NMN 600 mg.
This page is for information. It is not medical advice.