NAD+

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme present in every living cell, central to redox reactions, sirtuin activity, PARP-mediated DNA repair, and CD38 signaling. Cellular NAD+ levels decline measurably with age.

NAD+ is the cellular currency that powers your mitochondria, your DNA-repair enzymes, and your longevity proteins. Levels drop with age, and that decline is one of the most-studied features of aging. NAD+ research covers restoring those levels via direct injection or via precursors like NMN and NR.

Acts as the obligate substrate for sirtuins (SIRT1-7), PARP-1 DNA repair enzymes, and CD38. Restoring NAD+ supports oxidative phosphorylation, sirtuin-driven gene expression, and DNA damage response. Direct NAD+ administration bypasses the precursor conversion pathways used by NMN and NR.

Critical coenzyme for mitochondrial function and cellular repair. Declines with age.

1. NAD+
2. Mitochondrial and cellular-maintenance pathways
3. NAD+ availability, mitohormesis or senescent-cell signalling
4. Cellular-ageing and metabolic-resilience endpoints

A plain-English read on how much published evidence currently exists for NAD+. These ratings describe the volume and maturity of the literature — not effectiveness, safety, or suitability for any use.

Current limitations: most compounds in this category are studied in preclinical or small-sample settings. Absence of large controlled human trials is the single biggest limitation to keep in mind when reading any summary of NAD+.

Lyophilized compounds are supplied as a dry powder. Concentration is simply the total amount in the vial divided by the volume of bacteriostatic water added:

Concentration (mg/mL) = total mg in vial ÷ mL of diluent added

Commonly supplied vial sizes

100mg, 250mg, or 500mg vial

Worked concentration example

500mg + 5mL BAC water → 100mg/mL On U-100 insulin syringe:

• • 50 units = 50mg

Run your own numbers with the reconstitution calculator — it converts vial size and diluent volume into mg/mL and mcg/mL.

The figures below are reported here descriptively, because they are the values most frequently cited in publicly available research literature and reference material. They are not instructions, not a protocol, and not a recommendation. These compounds are supplied for laboratory research use only and are not approved by the FDA for human consumption.

Commonly cited amounts

IV: 100–500mg per session. SubQ: 50–100mg per session.

Commonly cited frequency

Weekly via IV, or 2–3× weekly SubQ

Commonly cited study duration

Ongoing maintenance

Peptides are supplied freeze-dried because peptide bonds degrade far faster in solution than in a dry state. Understanding storage is part of understanding why the powder form exists at all.

• •Lyophilized powder: stored refrigerated, typically stable for months to years.
• •Reconstituted solution: refrigerated at 2–8°C, generally discussed as stable for roughly 30–60 days.
• •Heat and direct light accelerate degradation — vials are kept cool and dark.
• •Reconstituted material is not re-frozen; ice crystal formation disrupts peptide structure.
• •Bacteriostatic water contains 0.9% benzyl alcohol as a preservative, which is what allows multi-day storage after reconstitution.

More detail in the storage & handling guide and how peptide quality is evaluated.

• •Mitochondrial function and biogenesis
• •Sirtuin activation studies
• •DNA repair and aging research
• •Neurodegenerative disease models
• •Comparison with NMN and NR precursors

A pillar of longevity, biohacker, and anti-aging conversation. Common debate: direct NAD+ injection or IV vs. oral NMN/NR precursors. Subcutaneous NAD+ protocols are widely discussed; IV protocols are mostly clinic-administered.

“The cellular battery that runs out with age.”

Often stacked with Glutathione (the master antioxidant), MOTS-c (mitochondrial peptide), SS-31/Elamipretide, and 5-Amino-1MQ in mitochondrial-research stacks.

NAD+ is a critical cellular coenzyme studied for restoring mitochondrial function, sirtuin activity, and DNA repair in longevity and metabolic research.