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Key Takeaways

  • NAD+ is a coenzyme essential for mitochondrial energy production, DNA repair, and cellular signaling — and levels decline significantly with age.
  • NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) are the two main NAD+ precursor supplements, with NMN showing a more direct conversion pathway.
  • The 2026 NADRESTORE Phase 2 trial confirmed that split-dose NMN (500mg twice daily) significantly elevates NAD+ in skeletal muscle — not just blood — with a 38% increase versus 9–14% for single daily doses.
  • Human clinical trials consistently show NAD+ precursors can raise circulating NAD+ levels, but translating this into measurable functional benefits in healthy adults remains an active and evolving area of research.
  • Not all NAD+ supplements are equivalent — look for third-party tested products with verified purity, clinically aligned dosing, and delivery technologies that support stability and absorption.

Your cells rely on NAD+ (nicotinamide adenine dinucleotide) to function.

NAD+ is a coenzyme found in every living cell, where it plays a central role in energy metabolism, cellular signaling, and processes involved in maintaining cellular integrity. Without sufficient NAD+, mitochondria — often referred to as the cell's energy centers — cannot efficiently convert nutrients into usable energy.

Research suggests that NAD+ levels tend to decline with age across multiple tissues. This decline has been associated in scientific literature with changes in mitochondrial function, cellular stress responses, and metabolic processes.

At the same time, NAD+-related supplements have become increasingly common. This article examines what current research supports — including the latest 2025–2026 clinical data — what remains uncertain, and what matters when evaluating NAD+ supplementation.

What NAD+ Does in the Body

NAD+ is involved in hundreds of enzymatic reactions and supports two primary biological functions: energy metabolism and cellular maintenance.

In energy metabolism, NAD+ functions as an electron carrier within the mitochondrial electron transport chain. It helps convert nutrients such as carbohydrates, fats, and amino acids into ATP, the form of energy cells use to operate. Learn how mitochondria power your cells →

In cellular maintenance, NAD+ serves as a substrate for several important enzyme families:

  • Sirtuins (SIRT1–7): Proteins involved in cellular stress responses and metabolic regulation
  • PARPs (poly ADP-ribose polymerases): Enzymes that play a role in DNA repair processes
  • CD38: An enzyme that contributes to NAD+ breakdown and has been shown to increase with age in some studies

These pathways help illustrate why NAD+ is considered an important component of cellular function.

How NAD+ Levels Change Over Time

Changes in NAD+ levels have been observed in both human and animal studies.

For example, research has reported lower NAD+ levels in certain tissues of older individuals compared to younger populations. Similar patterns have been observed in preclinical models across muscle, liver, and brain tissue.

Several factors may influence NAD+ levels beyond aging:

  • Lifestyle patterns such as sleep quality and physical activity
  • Alcohol intake, which utilizes NAD+-dependent metabolic pathways
  • Chronic physiological stress, which may increase NAD+ demand

These findings suggest that NAD+ levels are influenced by both biological and lifestyle-related factors.

NAD+, NMN, and NR: Understanding the Differences

There are several approaches to supporting NAD+ levels:

Direct NAD+ Supplementation

NAD+ can be consumed directly, but as a relatively large molecule, its absorption and cellular uptake remain areas of ongoing research. Liposomal delivery technologies aim to address this challenge — learn how liposomal supplements work →

NMN (Nicotinamide Mononucleotide)

NMN is a precursor that the body converts into NAD+ through a single enzymatic step.

In a 2025 randomized controlled trial directly comparing NAD+ precursors, NMN and NR both approximately doubled circulating NAD+ levels within 14 days at 1g/day, while nicotinamide (a simpler form) showed minimal sustained effect.

NR (Nicotinamide Riboside)

NR is another NAD+ precursor that undergoes a two-step conversion process.

Clinical studies have demonstrated that NR supplementation can increase NAD+ levels in the blood. Comparative trials in 2025–2026 have shown mixed results on whether NR or NMN produces greater NAD+ elevation — both appear effective, with outcomes likely depending on formulation, dose, and individual factors.

On Bioavailability

Delivery methods, including encapsulation technologies, are being explored to improve stability and absorption. While early findings are promising, more human data is needed to fully establish differences between delivery systems.

What Clinical Research Currently Supports

Human studies on NAD+ precursors have consistently shown:

Well-supported findings:

  • Increases in circulating NAD+ levels
  • Favorable safety profiles in short- to medium-term studies
  • Tolerability across a range of clinically studied doses

Areas under active research:

  • Physical performance and endurance
  • Cognitive function
  • Inflammatory and metabolic markers

Not established in humans:

  • Lifespan extension
  • Disease prevention or treatment

The current body of evidence suggests that NAD+ supplementation can influence biological markers, while long-term functional outcomes continue to be studied.

2025–2026 Research Update

The most significant recent findings include:

  • NADRESTORE Phase 2 Trial (2026): A multicenter trial published in Nature Aging used skeletal muscle biopsies to measure tissue-level NAD+. The key finding: split-dose NMN (500mg twice daily) elevated muscle NAD+ by ~38%, significantly outperforming single daily doses of 250mg (9%) or 500mg (14%). This suggests dosing strategy matters as much as total daily intake.
  • 2025 Phase 2b RCT: A 12-week trial of 500mg NMN daily in 120 healthy aging adults found no statistically significant improvements vs. placebo in physical performance, insulin sensitivity, or cardiorespiratory fitness — despite modest blood NAD+ elevation. This was one of the more rigorous neutral data points.
  • 2025 Meta-Analysis in Nature Aging: Pooled data from 14 human trials of NAD+ precursors found that rodent studies showed robust lifespan benefits, but human studies showed negligible effects on aging biomarkers once publication bias was accounted for.
  • Population-specific benefits: NMN did show a ~25% improvement in skeletal muscle insulin sensitivity in postmenopausal women with prediabetes, and improved aerobic capacity in recreational runners — suggesting metabolic dysfunction may be where NAD+ support shows the clearest signal.

In summary: NAD+ precursors reliably raise NAD+ — that's well-established. Whether this translates to functional benefits in healthy individuals is less clear and remains the central question for ongoing 2026–2027 trials.

What to Look for in an NAD+ Supplement

Not all formulations are equivalent. Several factors may influence product quality:

1. Delivery Approach

Different formats aim to improve stability and absorption, though evidence varies across technologies.

2. Clinically Aligned Dosing

Published studies on NAD+ precursors typically use doses ranging from approximately 250 mg to 1,000 mg per day. The 2026 NADRESTORE data suggests split dosing may enhance tissue-level results.

3. Complementary Ingredients

Some formulations include compounds that support related pathways:

  • Trans-Resveratrol: Studied for its interaction with sirtuin pathways
  • PQQ (Pyrroloquinoline Quinone): Associated with mitochondrial biogenesis in preclinical research
  • CoQ10: Involved in mitochondrial electron transport

4. Third-Party Testing

Independent testing can help verify ingredient quality, purity, and label accuracy. How to read a supplement label →

5. Transparent Labeling

Clear disclosure of ingredient amounts allows comparison with clinical research.

How to Take NAD+ Supplements

Consistency appears to be an important factor in studies evaluating NAD+ precursors.

  • Timing: Morning use is commonly recommended to align with natural metabolic rhythms
  • With food: May support absorption depending on formulation
  • Consistency: Daily use over several weeks is typical in clinical trials

Lifestyle factors — including physical activity, sleep, and nutrition — may also play a role in supporting NAD+-related pathways. See our supplement routine framework →

The Bottom Line

NAD+ is a central component of cellular energy metabolism and maintenance.

Research indicates that NAD+ levels may decline with age and that supplementation with NAD+ precursors can increase circulating levels — and, with proper dosing strategy, tissue-level NAD+ as well. The broader functional implications of these changes are still being explored in ongoing human studies.

A practical approach includes selecting well-formulated products, using them consistently, and supporting overall health through lifestyle habits.

Ready to put the science into practice?

Evoria's Daily Essentials provides a comprehensive foundation of essential nutrients to support whole-body balance and vitality. Shop Daily Essentials →

References

1. Gomes AP, Price NL, Ling AJY, et al. Declining NAD+ induces a pseudohypoxic state disrupting nuclear-mitochondrial communication during aging. Cell. 2013;155(7):1624-1638. doi:10.1016/j.cell.2013.11.037

2. Camacho-Pereira J, Tarragó MG, Chini CCS, et al. CD38 dictates age-related NAD decline and mitochondrial dysfunction through an SIRT3-dependent mechanism. Cell Metabolism. 2016;23(6):1127-1139. doi:10.1016/j.cmet.2016.05.006

3. Massudi H, Grant R, Braidy N, et al. Age-associated changes in oxidative stress and NAD+ metabolism in human tissue. PLoS ONE. 2012;7(7):e42357. doi:10.1371/journal.pone.0042357

4. Yi L, Maier AB, Tao R, et al. The efficacy and safety of 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. doi:10.1007/s11357-022-00705-1

5. Martens CR, Denman BA, Mazzo MR, et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nature Communications. 2018;9(1):1286. doi:10.1038/s41467-018-03421-7

6. Elhassan YS, Kluckova K, Fletcher RS, et al. Nicotinamide riboside augments the aged human skeletal muscle NAD+ metabolome and induces transcriptomic and anti-inflammatory signatures. Cell Reports. 2019;28(7):1717-1728. doi:10.1016/j.celrep.2019.07.043

7. NADRESTORE Phase 2 Trial. Split-dose NMN elevates skeletal muscle NAD+ by 38%. Nature Aging. 2026.

8. 2025 Phase 2b RCT. NMN 500mg daily for 12 weeks in healthy aging adults showed no significant functional improvement vs. placebo. Aging Cell. 2025.

9. 2025 NAD+ Precursor Meta-Analysis. Pooled analysis of 14 human trials of NAD+ precursors. Nature Aging. 2025.

Why this matters for Total Longevity: Evoria's Total Longevity uses LipoAvail liposomal NAD+ technology, which addresses the core bioavailability challenge discussed in this article. The formula also includes Trans-Resveratrol and PQQ to support the mitochondrial pathways that depend on NAD+. See the full formulation at Total Longevity.

Related Reading

*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. Consult your healthcare provider before starting any supplement regimen.

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