The essential coenzyme for cellular energy production and DNA repair that declines significantly with age.
NAD+ (Nicotinamide Adenine Dinucleotide) is a dinucleotide coenzyme found in every living cell, existing in oxidized (NAD+) and reduced (NADH) forms. It is one of the most critical molecules in human biology, serving as an electron carrier in the mitochondrial electron transport chain and as a substrate for over 500 enzymatic reactions. NAD+ levels decline by approximately 50% between ages 40 and 60, and this decline is now recognized as a central driver of multiple hallmarks of aging including mitochondrial dysfunction, genomic instability, and impaired cellular senescence clearance. Direct NAD+ supplementation via IV or subcutaneous injection bypasses the rate-limiting steps of oral precursor conversion (NMN, NR) and rapidly restores cellular NAD+ pools. Research interest has expanded dramatically following discoveries linking NAD+ to sirtuin activation, PARP-mediated DNA repair, and the regulation of circadian rhythms.
* Benefits based on preclinical/animal research unless otherwise noted.
NAD+ functions as a hydride (H-) acceptor in oxidation-reduction reactions, cycling between NAD+ and NADH in glycolysis, the TCA cycle, and the mitochondrial electron transport chain. Beyond energy metabolism, NAD+ is consumed as a substrate by three major enzyme classes: sirtuins (SIRT1-7, NAD+-dependent deacylases that regulate gene expression, mitochondrial biogenesis, and inflammation), PARP enzymes (poly-ADP-ribose polymerases that repair DNA strand breaks), and CD38/CD157 (NAD+ glycohydrolases involved in calcium signaling and immune function). SIRT1 activation by elevated NAD+ deacetylates and activates PGC-1α (driving mitochondrial biogenesis), FOXO3a (promoting stress resistance), and NF-κB (reducing inflammation). SIRT3 in mitochondria activates antioxidant enzymes and optimizes electron transport chain efficiency. The competition between PARP enzymes and sirtuins for NAD+ means that chronic DNA damage can deplete NAD+ and impair sirtuin-mediated longevity pathways.
Protocol Notes: IV infusion should be administered slowly (over 2–4 hours) to minimize side effects. SC injection is more practical for home use. Oral precursors (NMN, NR) are alternatives with lower bioavailability.
Dissolve in sterile saline or bacteriostatic water per prescriber instructions.
When sourcing NAD+ for research purposes, the following quality benchmarks should be verified before use.
Lyophilized: refrigerate. Reconstituted: use within 24 hours.
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Moderate Evidence — Multiple animal studies and/or early human trials. Reasonable confidence in mechanism, but human data is limited.
Peptides commonly used alongside NAD+ for synergistic effects.
Tetrapeptide / Telomerase Activator
A tetrapeptide derived from the pineal gland that activates telomerase and has demonstrated lifespan extension in multiple animal models.
Learn More: EpithalonTelomerase Activator — Oral
Oral Epithalon for convenient telomerase activation and longevity support.
Learn More: Epithalon (Capsule)