NMN vs NAD+: What’s the Difference & Which Is Better?

NMN and NAD+ often appear together in discussions about cellular energy and healthy ageing. They are closely connected, but they are different molecules with different roles.

NAD+ is a coenzyme your cells use, while NMN is a building block your body can use to make it. When comparing oral supplements, NMN has stronger human evidence for raising blood NAD+ levels. Whether that translates into noticeable, lasting health benefits is less certain.

What Is NAD+?

NAD+ stands for nicotinamide adenine dinucleotide. It is found throughout the body and helps cells transfer electrons during the processes that turn food into usable energy. It also supports enzymes involved in DNA repair and cellular maintenance.

Research has linked ageing with lower NAD+ levels in certain tissues, although the pattern varies. This has encouraged interest in whether supporting NAD+ production could benefit health as we age. However, NAD+ having an essential biological role does not automatically mean taking a supplement improves those functions.

What Is NMN?

NMN stands for nicotinamide mononucleotide. It occurs naturally in the body and forms part of the pathways used to produce NAD+.

Taking NMN is therefore an indirect approach: it supplies a precursor rather than the finished coenzyme. Human trials have shown that oral NMN can increase blood NAD+ concentrations, although blood measurements do not tell us exactly what happens in every organ or tissue.

NMN vs NAD+ Supplements: Which Is Better Absorbed?

Taking NAD+ directly might sound more straightforward. However, swallowing a molecule does not guarantee that it reaches cells intact. Digestion, breakdown and transport all affect what the body can use.

NMN has been investigated in several oral human trials, giving it a clearer evidence base for raising blood NAD+. Direct oral NAD+ has a less established clinical evidence base. This supports NMN as the better-studied approach, rather than proving that every NMN product is superior to every NAD+ formulation.

Rather than taking NAD+ directly, a better approach may be to choose a supplement formulated to support the body’s own NAD+ production, such as Kratox NAD+ - a precise blend of five ingredients selected with this goal in mind.

What Benefits Have Human Studies Found?

In a 60-day randomised trial, daily NMN doses of 300, 600 or 900 mg increased blood NAD+ levels. Researchers also reported improvements in six-minute walking distance and some self-reported health measures. These findings are encouraging, but one short trial cannot establish long-term benefits.

A separate 10-week study involving 25 postmenopausal women with prediabetes found improved muscle insulin sensitivity with 250 mg daily. Body composition and several other metabolic measures did not improve. These results apply to a specific population, rather than demonstrating benefits for everyone.

Raising NAD+ is a measurable biological effect; feeling more energetic or living longer is a separate outcome. Human research has not established that NMN or NAD+ supplements extend lifespan or reverse ageing.

Which Ingredients Support NAD+ Production?

NMN and nicotinamide riboside (NR) are NAD+ precursors: ingredients the body can use to make NAD+. Both have been shown in human studies to increase blood NAD+ levels, making them relevant options for those interested in supporting NAD+ production.

Resveratrol, quercetin and trimethylglycine (TMG) are sometimes included alongside these precursors, although they play different roles. Resveratrol and quercetin are plant compounds studied in relation to cellular health, while TMG acts as a methyl donor in the body. They should not be considered equivalent to NMN or NR as proven ways to raise NAD+ in humans.

For a combined approach, Kratox NAD+ brings together NMN, nicotinamide riboside, resveratrol, TMG and quercetin in one formula, pairing two NAD+ precursors with three complementary ingredients.

Kratox Longevity combines 500 mg NMN and 1,000 mg trans-resveratrol per daily serving, bringing together a NAD+ precursor with a plant compound studied for its antioxidant properties and role in healthy ageing research. 

Frequently Asked Questions

Is NMN the same as NAD+?

No. NMN is a precursor used in NAD+ production. NAD+ is the coenzyme that participates in cellular processes.

Are NMN supplements safe?

Short human trials have generally found NMN well tolerated at the doses studied. Long-term safety is less established, and short-term findings do not guarantee safety for everyone.

Which Is Better?

For oral supplementation specifically intended to raise blood NAD+, NMN has the clearer supporting human evidence. That is a narrower claim than calling it a proven anti-ageing supplement. Choose based on the formulation and relevant research, with realistic expectations about what supplementation can achieve.

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References:
Yi, L. et al. (2023). The efficacy and safety of β-nicotinamide mononucleotide supplementation in healthy middle-aged adults. GeroScience.
Yoshino, M. et al. (2021). Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science.
Freeberg, K. A. et al. (2023). Dietary Supplementation With NAD+-Boosting Compounds in Humans: Current Knowledge and Future Directions. The Journals of Gerontology: Series A.