NAD+ Injection vs Oral NR and NMN: What Studies Show
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NAD+ injection vs oral NR or NMN: what do studies show?

Route · Human studies · Evidence gaps

Short answer: Oral precursors have more human data. Nicotinamide riboside (NR) and NMN raise blood NAD+ levels in controlled trials and are generally well tolerated.1 For NAD+ given directly, the main human study is an 11-man IV pilot: plasma NAD+ did not rise for the first 2 hours of a 6-hour infusion.2 A 2026 review found no outcome trials of IV or injected NAD+.1

How do NAD+ injections and oral precursors compare?

From published human studies and systematic reviews. None of these is an FDA-approved drug.
NAD+ (IV or injection)Oral NR or NMN
What it isNAD+ itselfPrecursors the body converts to NAD+3
Human pharmacokinetic dataOne IV pilot, 11 men (8 infused)2Several trials, e.g. NR single doses of 100, 300 and 1,000 mg;4 NMN single doses of 100 to 500 mg5
Doses studied750 mg IV over 6 hours2NR 500 mg twice daily for 6 weeks;6 NMN 250 mg daily for 10 weeks7
Effect on blood NAD+No plasma rise for at least the first 2 hours; it was removed from plasma quickly2Dose-dependent rise in the blood NAD+ metabolome4
Controlled outcome trialsNone found in a 2026 systematic review128 randomized human studies in that review; outcome results mixed or often null1
Example outcomeNot studiedNMN raised muscle insulin sensitivity in 25 women with prediabetes7
Under-the-skin injection dataNo published human half-lifeNot applicable
Tolerability reportedNo adverse events in the IV pilot2Generally well tolerated over weeks to months1

Reviewed . Half-life figures are shown only where the value Dose Track uses agrees with the cited source.

What happens when NAD+ is infused?

In the one published human study, 8 healthy men received 750 mg of NAD+ IV over 6 hours (3 controls got none). Surprisingly, plasma NAD+ and its breakdown products did not change for the first 2 hours: the infused NAD+ was removed from the blood quickly and completely. Later, NAD+ and methylnicotinamide appeared in urine.2 The authors say the pattern is consistent with enzymes breaking NAD+ down.2 The study did not measure health outcomes. We found no published human data for NAD+ injected under the skin.

What do the oral precursor trials show?

  • NR, single doses: 100, 300 and 1,000 mg produced dose-dependent rises in blood NAD+ metabolites. The study was sponsored by the NR supplier.4
  • NR, 6 weeks: 500 mg twice daily in healthy middle-aged and older adults was well tolerated and raised NAD+ metabolism; effects on blood pressure were exploratory.6
  • NMN, 10 weeks: 250 mg daily in 25 overweight women with prediabetes (13 on NMN) increased muscle insulin sensitivity.7

A 2026 systematic review of 33 human studies found oral NR and NMN consistently raise NAD-related markers, but effects on function and health outcomes were mixed and often null.1 No study has compared NAD+ injections with oral precursors head to head. These are study protocols, not personalized advice; confirm any dosing with your prescriber.

This page summarizes labels and published studies. It is not personalized medical advice; confirm any dose or change with your prescriber.
BPC-157 vs GHK-Cu: what does the evidence show?Injected pilot data vs mostly topical skin studies MOTS-c vs SS-31: how do they differ?Mouse-stage peptide vs an FDA-approved drug

Frequently asked questions

Does an NAD+ IV raise blood NAD+?+
In the one human pilot, plasma NAD+ did not rise for the first 2 hours of a 750 mg, 6-hour infusion because it was cleared from the blood quickly.2
Do NR and NMN raise NAD+?+
Yes. Controlled human trials show they raise NAD+ and related metabolites in blood, though benefits on health outcomes are mixed.41
Is there evidence that NAD+ injections work for anti-aging?+
A 2026 systematic review found no eligible outcome trials of IV or intramuscular NAD+ for anti-aging or wellness.1
What is the half-life of injected NAD+?+
There is no published human value for NAD+ injected under the skin.
Can I track NAD+ in Dose Track?+
Yes. Injectable NAD+ is built in with reconstitution math. Oral NR or NMN can be added as custom medications with daily reminders.

Sources

  1. Gallagher C, Emmanuel OO. NAD+ supplementation for anti-aging and wellness: a PRISMA-guided systematic review. Ageing Res Rev. 2026;116:103057.
  2. Grant R, et al. A pilot study investigating changes in the human plasma and urine NAD+ metabolome during a 6 hour intravenous infusion of NAD. Front Aging Neurosci. 2019;11:257.
  3. Freeberg KA, et al. Dietary supplementation with NAD+-boosting compounds in humans: current knowledge and future directions. J Gerontol A Biol Sci Med Sci. 2023;78:2435-48.
  4. Trammell SA, et al. Nicotinamide riboside is uniquely and orally bioavailable in mice and humans. Nat Commun. 2016;7:12948.
  5. Irie J, et al. Effect of oral administration of nicotinamide mononucleotide on clinical parameters and nicotinamide metabolite levels in healthy Japanese men. Endocr J. 2020;67:153-160.
  6. Martens CR, et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nat Commun. 2018;9:1286.
  7. Yoshino M, et al. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science. 2021;372:1224-9.

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