Both raise blood NAD+ in human trials and no head-to-head human study compares them directly. NR has the deeper evidence for NAD+ elevation specifically (PMID 29599478); NMN shows both NAD+ elevation (PMID 35479740) and promising functional results.

Is NMN a legal supplement in the US?

The FDA has taken the position that NMN cannot be lawfully marketed as a dietary-supplement ingredient in the United States. This is a live regulatory distinction, so NMN's availability differs from typical supplements.

Does NMN actually do anything in people?

Randomized trials report NAD+ elevation (PMID 35479740) and functional signals such as improved gait and grip in older men (reported as nominal/exploratory, PMID 35927255) and improved muscle insulin sensitivity in postmenopausal prediabetic women (P=0.022, PMID 33888596). The insulin finding is specific to that population.

Yes — a randomized crossover trial showed a clear rise in blood-cell NAD+ with NR (PMID 29599478). This is the precursor with the most direct NAD+-elevation evidence.

How much should I take?

Human NMN trials commonly used 250 mg/day (PMID 35479740). Given the regulatory and evidence picture, confirm the precursor and dose that fit your situation with your healthcare provider.

Moderate Evidence

Best NAD+ Precursor: NMN vs NR (Nicotinamide Riboside)

NMN and NR both raise NAD+ in human studies, and no trial pits them directly against each other. NR is the best-evidenced form for NAD+ elevation; NMN shows promising functional results. Note that the FDA disputes NMN's status as a lawful supplement ingredient in the US. Confirm your choice and dose with a healthcare provider.

Updated 2026 · Reviewed by Dr. Brennan Commerford, D.C.

All Forms Ranked by Evidence

1
100/ 100· Top TierBest by EvidenceFF Preferred
Nicotinamide Mononucleotide (NMN)
Form: Β-Nicotinamide Mononucleotide
—
Verification pending
NAD+ (stabilized)
Form: stabilized
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
NADH
Form: Base
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pending
NADH (alt grade)
Form: Base
Evidence for this form is under review — no score is shown until it is verified.
—
Verification pendingFF Preferred
Nicotinamide Riboside Chloride (NR)
Form: Chloride
Evidence for this form is under review — no score is shown until it is verified.

Editorial note

Both NMN and NR reliably raise blood NAD+ in human trials, and no head-to-head human study directly compares them. Nicotinamide Riboside (NR) has the deeper record specifically for raising NAD+ — a randomized crossover trial showed a clear NAD+ rise in blood cells (PMID 29599478). NMN has its own solid human evidence for both NAD+ elevation and function: NMN raised blood NAD+ across 12 weeks in healthy subjects (PMID 35479740), and other randomized trials reported functional signals (PMID 35927255, PMID 33888596). Important regulatory note: in the United States the FDA has taken the position that NMN cannot be lawfully marketed as a dietary-supplement ingredient, so its availability differs from typical supplements. Confirm the right precursor and dose for your situation with a healthcare provider.

All Forms Compared

NMN (Nicotinamide Mononucleotide)

Best For

NAD+ support with emerging functional evidence

Functional signals in randomized trials: improved gait/grip in older men, reported as nominal/exploratory (PMID 35927255); improved muscle insulin sensitivity in postmenopausal prediabetic women, P=0.022 (PMID 33888596).

Nicotinamide Riboside (NR)

Best For

Best-evidenced NAD+ elevation

A randomized crossover trial showed a clear blood-cell NAD+ rise (PMID 29599478).

NADH

Best For

An alternative NAD-pathway input

Niacinamide (Nicotinamide)

Best For

Basic, low-cost NAD support

Frequently Asked Questions

Is NMN or NR better?: Both raise blood NAD+ in human trials and no head-to-head human study compares them directly. NR has the deeper evidence for NAD+ elevation specifically (PMID 29599478); NMN shows both NAD+ elevation (PMID 35479740) and promising functional results.
Is NMN a legal supplement in the US?: The FDA has taken the position that NMN cannot be lawfully marketed as a dietary-supplement ingredient in the United States. This is a live regulatory distinction, so NMN's availability differs from typical supplements.
Does NMN actually do anything in people?: Randomized trials report NAD+ elevation (PMID 35479740) and functional signals such as improved gait and grip in older men (reported as nominal/exploratory, PMID 35927255) and improved muscle insulin sensitivity in postmenopausal prediabetic women (P=0.022, PMID 33888596). The insulin finding is specific to that population.
Does NR raise NAD+?: Yes — a randomized crossover trial showed a clear rise in blood-cell NAD+ with NR (PMID 29599478). This is the precursor with the most direct NAD+-elevation evidence.
How much should I take?: Human NMN trials commonly used 250 mg/day (PMID 35479740). Given the regulatory and evidence picture, confirm the precursor and dose that fit your situation with your healthcare provider.

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FormulaForge formulates and sells supplements containing the ingredients discussed on this page. Our formulary recommendations are based on peer-reviewed bioavailability research. All cited studies are independently verifiable.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.