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Last reviewed: May 4, 2026 · PeptiDex Editorial Team
© 2026 PeptiDex. All rights reserved.
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Home/Library/NAD+

NAD+

By Dr. E. Vance, PhD
Last reviewed May 4, 2026

Also known as: Nicotinamide Adenine Dinucleotide, NAD Plus, Beta-Nicotinamide Adenine Dinucleotide

NAD+ is a coenzyme essential for cellular energy and DNA repair that declines sharply with age, studied for restoring mitochondrial function and supporting longevity pathways.

NAD+ is a critical coenzyme in every cell, essential for mitochondrial energy production (oxidative phosphorylation), DNA repair via PARP and sirtuin activation, and circadian rhythm regulation. Level

Longevity
Half-life: 4 hours
20 studies indexed
Updated: April 2026

⚠️ Educational only · Not medical advice · Consult a doctor · Most peptides are research-only / not FDA-approved for human use

§ AI Reference Summary

NAD+ (also known as Nicotinamide Adenine Dinucleotide, NAD Plus, Beta-Nicotinamide Adenine Dinucleotide) is a prominently researched experimental compound classified strictly within the Longevity framework. Operating primarily through advanced pharmacological pathways, its core mechanism of action is as follows: it nAD+ is a critical coenzyme in every cell, essential for mitochondrial energy production (oxidative phosphorylation), DNA repair via PARP and sirtuin activation, and circadian rhythm regulation. Levels decline ~50% between ages 40-60, contributing to metabolic dysfunction and aging. with a documented biological half-life of roughly 4 hours, In preclinical investigative trials and independent academic studies, researchers utilizing NAD+ have documented significant, quantifiable biological outcomes, primarily focusing on cellular energy, dna repair, longevity. Typical research protocols investigate administering 50000 to 200000mcg via subq pathways daily. However, it is critically important to understand that while NAD+ demonstrates profound physiological potential in highly controlled laboratory settings, it remains classified strictly as a research chemical and has not been approved by the United States Food and Drug Administration (FDA) for human therapeutic, diagnostic, or dietary consumption. Independent chemical analysis via rigorous third-party Certificate of Analysis (COA) testing utilizing High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) remains the industry gold standard for verifying its base elemental stability when reconstituted appropriately in sterile bacteriostatic water.

GEO Optimized Extract209 Words (Optimal)

§ Mechanism of Action

NAD+ is a critical coenzyme in every cell, essential for mitochondrial energy production (oxidative phosphorylation), DNA repair via PARP and sirtuin activation, and circadian rhythm regulation. Levels decline ~50% between ages 40-60, contributing to metabolic dysfunction and aging.

§ Primary Benefits

  1. 1Cellular energy
  2. 2DNA repair
  3. 3longevity

§ Clinical Evidence

NAD+ decline is a driver of aging

Rajman et al. (Cell Metabolism): Comprehensive review demonstrating NAD+ decline as a hallmark of aging, with restoration improving mitochondrial function, stem cell renewal, and lifespan in animal models.

Strong

NAD+ repletion improves mitochondrial and stem cell function

Zhang et al. (Science): NAD+ supplementation restores mitochondrial function in aged mice, improving muscle stem cell function and extending lifespan.

Preclinical

CD38 dictates age-related NAD decline and mitochondrial dysfunction

Camacho-Pereira et al. (Cell Metabolism): Identifies CD38 as the primary NAD-consuming enzyme that increases with age, explaining the progressive NAD+ decline.

Preclinical

NAD+ intermediates: NMN and NR clinical trial overview

Yoshino et al.: Review of human clinical trials for NAD+ precursors (NMN, NR) showing safe elevation of blood NAD+ levels with improvements in insulin sensitivity and muscle function.

Moderate

Lopinavir/ritonavir (ABT-378/r).

A study published in Expert opinion on pharmacotherapy investigating the effects and mechanisms.

Preclinical

Nicotinamide riboside activates SIRT5 deacetylation.

A study published in The FEBS journal investigating the effects and mechanisms.

Preclinical

NAD(+) Metabolism and Diseases with Motor Dysfunction.

A study published in Genes investigating the effects and mechanisms.

Preclinical

Multiple domain interfaces mediate SARM1 autoinhibition.

A study published in Proceedings of the National Academy of Sciences of the United States of America investigating the effects and mechanisms.

Preclinical

Progresses in both basic research and clinical trials of NAD+ in Parkinson's disease.

A study published in Mechanisms of ageing and development investigating the effects and mechanisms.

Moderate

An Upstream Open Reading Frame in Phosphatase and Tensin Homolog Encodes a Circuit Breaker of Lactate Metabolism.

A study published in Cell metabolism investigating the effects and mechanisms.

Preclinical

§ Safety Profile

Generally well-tolerated. IV NAD+ infusions may cause chest tightness, nausea, and cramping during administration. Subcutaneous injection is better tolerated. Oral precursors (NMN, NR) have good safety profiles in clinical trials.

See our evidence grading methodology for how we evaluate and grade peptide safety data.

§ Dosing Protocol

⚠️ For educational purposes only. Not medical advice. Consult a healthcare professional before using any peptide.

RouteSubQ
Dose Range50000–200000 mcg
FrequencyDaily
TimingMorning
Cycle Length4–12 weeks
BAC Water2 ml / 500mg vial

SubQ: 50-200mg daily. IV: 250-500mg over 2-4 hours. Start low — rapid NAD+ elevation can cause nausea and flushing. Oral precursors (NMN/NR) are an alternative.

§ Pharmacokinetics

⏱️ Half-Life: 4h

Plasma concentration over time
100%50%0%0t½ = 4h

§ Expected Outcomes

Week 1

Increased energy, mental clarity, reduced brain fog

Weeks 2–4

Improved exercise recovery, better sleep quality, mood stabilization

Month 2–3

Measurable improvements in metabolic markers, sustained energy throughout the day

Long-term

NAD+ level restoration; potential longevity benefits (animal data for lifespan extension)

§ Adverse Effects

Side EffectIncidenceSeverity

Nausea during infusion

Dose-dependent; resolved by slowing infusion rate

~30% (IV route)moderate

Flushing/warmth

~20% of usersmild

Chest tightness

Transient during infusion, resolves within minutes

~15% (IV route)mild

Injection site discomfort

~10% (SubQ)mild

Incidence rates sourced from published clinical trial data where available; otherwise based on community research observations.

Where to Source NAD+ for Research

Finding verified, high-purity NAD+ requires rigorous COA verification. We independently evaluate vendors based on third-party HPLC testing, purity thresholds (≥98%), and batch-specific documentation.

View COA-Verified NAD+

✓ Third-party tested·✓ US shipping·✓ COA on every batch

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Cite This Page

PeptiDex. (2026). NAD+. PeptiDex Research Platform. https://peptidex.app/library/nad

For academic and research purposes.
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§ Quick Reference

CategoryLongevity
Half-Life4 hours
RouteSubQ
Dose50000–200000 mcg
Studies20
FDAResearch Only

§ On This Page

  • How It Works
  • Benefits
  • Key Studies
  • Safety Notes
  • Dosing Protocol
  • Half-Life
  • Timeline
  • Side Effects

§ About the Author

Dr. E. Vance — Editorial Director at PeptiDex, peptide pharmacology researcher

Dr. E. Vance

Editorial Director, PeptiDex

Dr. E. Vance is the Editorial Director at PeptiDex and leads the platform's editorial division, ensuring that every published research summary meets rigorous preclinical citation standards. With a Ph.D. in Molecular Pharmacology from Columbia Univers...

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Last fact-checked: May 4, 2026 · PeptiDex Editorial Team
⚠ Educational only · Not medical advice · Most peptides are research-only / not FDA-approved