Need help or have questions about your order? Call 510-991-8265Questions about your order? Call 510-991-8265

Sign InShop GLPs
Shop GLPs

NMN and NR for Adults 65+: Caregiver Administration Guidance

By
Published Updated Last reviewed
16 linked public sourcesEditorial, sourcing, and corrections policy

Key numbers

  • 250 mgNMN trial dose, once daily, in healthy older men; raised whole-blood NAD+ over 6 or 12 weeksSource: pubmed.ncbi.nlm.nih.gov, as cited 2026-11-07
  • 1,500 mg twice dailyNR trial dose in 20 people with Parkinson's disease; no moderate or severe adverse eventsSource: pubmed.ncbi.nlm.nih.gov, as cited 2026-11-07
  • 12 weeksLongest human safety data: safety beyond about 12 weeks is not establishedSource: pubmed.ncbi.nlm.nih.gov, as cited 2026-11-07

At a glance

  • What they are / Oral dietary supplements, not FDA-approved drugs [5]
  • Approved dose / None; no official RDA, upper limit or FDA-endorsed dose [6]
  • NMN trial doses / 250 mg daily for 6 to 12 weeks [1]; 300 to 900 mg daily for 60 days [3]
  • NR trial doses / 1,000 mg twice daily for 12 weeks [8]; 1,500 mg twice daily for 4 weeks [9]
  • Functional effect / No significant effect on grip strength, gait speed or chair stand in a 2025 meta-analysis [4]

The doses studied in trials

NMN and NR are sold as oral dietary supplements, and neither is an FDA-approved drug; no NAD+-precursor product is approved to treat aging or any disease [5]. There is no official RDA, upper limit or FDA-endorsed dose for either one, so every number here is a trial dose, not a recommendation [6].

In healthy older men, 250 mg NMN once daily for 6 or 12 weeks raised whole-blood NAD+ with no significant harmful effect; gait speed and left grip improved only nominally, and body composition did not change [1]. In 80 healthy middle-aged adults, 300 to 900 mg daily for 60 days raised blood NAD [3], and 1,250 mg daily for up to 4 weeks was tested in 31 adults aged 20 to 65 [10]. For NR, 40 sedentary obese men aged 40 to 70 took 1,000 mg twice daily for 12 weeks [8], and 20 people with Parkinson's disease took 1,500 mg twice daily for 4 weeks [9].

What people on Reddit report

These are forum accounts from people taking NMN on their own, comparing the doses they chose and how their bodies responded. They are not older adults or clinical reports.

xszander · NMN

I think you know the answer lol. 250 for sure. 28 and I got headaches at 500.

Says a lower dose worked better and that a higher dose caused headaches.

Read the source discussion

ohyoubearfucker · NMN

Fellow 35m here. You are unlikely to need 600mg. I personally take 250mg 4-5 times per week, more if I had a beer or some junkfood the night before. And don't forget the TMG.

Says a much higher dose is probably not needed and describes taking a lower amount on an irregular schedule.

Read the source discussion

Exciting_Drama_5965 · NMN

I'm 46 female and take 500 mg NMN with 500 mg TMG (1:1) You can over- and under-methylate as well. Younger people (loose def.) probably need less NMN.

Reports taking a higher dose paired with another supplement, and suggests younger people need less.

Read the source discussion

Questions worth asking

Choose the questions you want to keep

Did strength or walking change?

Mostly not. A 2025 meta-analysis of randomized trials in older adults (mean ages 60.9 to 83) found no significant effect of NMN on skeletal muscle index, handgrip strength, gait speed or the five-times chair stand [4]. A second meta-analysis of 12 studies and 513 participants found NMN raised blood NAD, but fasting glucose, triglycerides and cholesterol did not differ significantly from control [11]. In 12 men aged 70 to 80 given 1 g NR daily for 21 days, muscle NAD+ itself was not raised (210 vs 197 pmol/mg), although a marker of NAD+ synthesis roughly doubled; mitochondrial respiration, grip strength and insulin sensitivity were unchanged [12].

Side effects and unknowns

In 20 people with Parkinson's disease, NR 1,500 mg twice daily for 4 weeks produced no moderate or severe adverse events, and serum homocysteine showed a slight initial rise [9]. NMN 250 mg daily for 12 weeks caused no abnormalities in physiological or laboratory tests [2], and 1,250 mg daily for up to 4 weeks produced no severe adverse events [10]. NR was well tolerated in a randomized crossover trial of middle-aged and older adults [13]. Long-term human safety beyond about 12 weeks has not been established, and the available trials were short and small [6]. Pregnancy, breastfeeding, children and people with cancer or kidney or liver disease were not studied in the cited trials, so safety in these groups is unknown [6].

Regulatory status

Trade press reported that FDA said in 2022 that NMN was excluded from the supplement definition. FDA's response to a citizen petition, dated 2025-09-29, was reported to reverse that position, concluding NMN is not excluded and may be marketed as a dietary supplement. NMN remains a new dietary ingredient, so new-dietary-ingredient notification rules still apply [5][14]. For NR, FDA answered GRAS notice GRN 000635 with a 2016 letter saying it had no questions at that time and had not made its own GRAS determination [15].

Frequently asked questions

Is there an approved NMN or NR dose for adults over 65?
No. Neither is an FDA-approved drug, and there is no official RDA, upper limit or FDA-endorsed dose; trial doses such as NMN 250 mg daily are not recommendations [5][6][1].
Does NMN improve strength or walking in older adults?
A 2025 meta-analysis found no significant effect of NMN on skeletal muscle index, handgrip strength, gait speed or the five-times chair stand in trials of older adults [4].
Is NMN legal to buy in the US?
FDA's response to a citizen petition, dated 2025-09-29, was reported to conclude that NMN is not excluded from the dietary supplement definition; it may be marketed as a supplement subject to new-dietary-ingredient notification rules [5].

What people actually ask

What is the most effective way to take NMN?

No most effective way to take NMN is established. Trials used fixed daily doses, such as NMN 250 mg once daily for 6 to 12 weeks, and these are trial doses, not recommendations. No official RDA, upper limit or FDA-endorsed dose exists for NMN.

Is nmn recommended for young people?

No recommendation of NMN for young people is given. None of the cited trials studied children, so safety in children is unknown. Long-term human safety beyond about 12 weeks has also not been established.

Should I add NMN supplement for my wife's daily used?

Adding NMN to a daily routine is not supported by established dosing. There is no established NMN dose for adults, and neither NMN nor NR is an FDA-approved drug. Long-term safety beyond about 12 weeks has not been established, and the trials were short and small.

References

  1. Igarashi M, Nakagawa-Nagahama Y, Miura M, Kashiwabara K, Yaku K, Sawada M, et al. Chronic nicotinamide mononucleotide supplementation elevates blood nicotinamide adenine dinucleotide levels and alters muscle function in healthy older men. NPJ Aging. 2022;8(1):5. Chronic nicotinamide mononucleotide supplementation elevates blood nicotinamide adenine dinucleotide levels and alters muscle function in healthy older men
  2. Okabe K, Yaku K, Uchida Y, Fukamizu Y, Sato T, Sakurai T, et al. Oral Administration of Nicotinamide Mononucleotide Is Safe and Efficiently Increases Blood Nicotinamide Adenine Dinucleotide Levels in Healthy Subjects. Front Nutr. 2022;9:868640. Oral Administration of Nicotinamide Mononucleotide Is Safe and Efficiently Increases Blood Nicotinamide Adenine Dinucleotide Levels in Healthy Subjects
  3. Yi L, Maier AB, Tao R, Lin Z, Vaidya A, Pendse S, et al. The 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 trial. Geroscience. 2023;45(1):29-43. The 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 trial
  4. Prokopidis K, Moriarty F, Bahat G, McLean J, Church DD, Patel HP. The Effect of Nicotinamide Mononucleotide and Riboside on Skeletal Muscle Mass and Function: A Systematic Review and Meta-Analysis. J Cachexia Sarcopenia Muscle. 2025;16(3):e13799. The Effect of Nicotinamide Mononucleotide and Riboside on Skeletal Muscle Mass and Function: A Systematic Review and Meta-Analysis
  5. Official web page. Official web page
  6. Freeberg KA, Udovich CC, Martens CR, Seals DR, Craighead DH. Dietary Supplementation With NAD+-Boosting Compounds in Humans: Current Knowledge and Future Directions. J Gerontol A Biol Sci Med Sci. 2023;78(12):2435-2448. Dietary Supplementation With NAD+-Boosting Compounds in Humans: Current Knowledge and Future Directions
  7. Yoshino M, Yoshino J, Kayser BD, Patti GJ, Franczyk MP, Mills KF, et al. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science. 2021;372(6547):1224-1229. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women
  8. Dollerup OL, Christensen B, Svart M, Schmidt MS, Sulek K, Ringgaard S, et al. A randomized placebo-controlled clinical trial of nicotinamide riboside in obese men: safety, insulin-sensitivity, and lipid-mobilizing effects. Am J Clin Nutr. 2018;108(2):343-353. A randomized placebo-controlled clinical trial of nicotinamide riboside in obese men: safety, insulin-sensitivity, and lipid-mobilizing effects
  9. Berven H, Kverneng S, Sheard E, Søgnen M, Af Geijerstam SA, Haugarvoll K, et al. NR-SAFE: a randomized, double-blind safety trial of high dose nicotinamide riboside in Parkinson's disease. Nat Commun. 2023;14(1):7793. NR-SAFE: a randomized, double-blind safety trial of high dose nicotinamide riboside in Parkinson's disease
  10. Fukamizu Y, Uchida Y, Shigekawa A, Sato T, Kosaka H, Sakurai T. Safety evaluation of β-nicotinamide mononucleotide oral administration in healthy adult men and women. Sci Rep. 2022;12(1):14442. Safety evaluation of β-nicotinamide mononucleotide oral administration in healthy adult men and women
  11. Zhang J, Poon ET, Wong SH. Efficacy of oral nicotinamide mononucleotide supplementation on glucose and lipid metabolism for adults: a systematic review with meta-analysis on randomized controlled trials. Crit Rev Food Sci Nutr. 2025;65(22):4382-4400. Efficacy of oral nicotinamide mononucleotide supplementation on glucose and lipid metabolism for adults: a systematic review with meta-analysis on randomized controlled trials
  12. Elhassan YS, Kluckova K, Fletcher RS, Schmidt MS, Garten A, Doig CL, et al. Nicotinamide Riboside Augments the Aged Human Skeletal Muscle NAD+ Metabolome and Induces Transcriptomic and Anti-inflammatory Signatures. Cell Rep. 2019;28(7):1717-1728.e6. Nicotinamide Riboside Augments the Aged Human Skeletal Muscle NAD+ Metabolome and Induces Transcriptomic and Anti-inflammatory Signatures
  13. Martens CR, Denman BA, Mazzo MR, Armstrong ML, Reisdorph N, McQueen MB, et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nat Commun. 2018;9(1):1286. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults
  14. Official web page. Official web page
  15. Agency Response Letter GRAS Notice No. GRN 000635 | FDA. Agency Response Letter GRAS Notice No. GRN 000635 | FDA
  16. Reddit participants. How much dosage should I take as someone who looks to start taking NMN (r/NMN). Accessed 2026-11-10.
Evidence overview for age v2 nad nmn: NMN and NR for Adults 65+: Caregiver Administration Guidance