Full reference for injectable NAD+ โ mechanism, evidence table, loading protocol, flush risk, and COA-verified vendor pricing.
Research context only. This page is for educational purposes based on published research. Not medical advice.
NAD+ occupies a central position in cellular biology. As a coenzyme, it participates in over 500 enzymatic reactions โ far more than most nutrients or supplements. Its decline with age is not incidental; it's mechanistically linked to virtually every major hallmark of aging: mitochondrial dysfunction, genomic instability, epigenetic dysregulation, and cellular senescence.
The three key pathways: (1) Energy metabolism โ NAD+ is the primary electron acceptor in the TCA cycle and electron transport chain; low NAD+ = low ATP production. (2) DNA repair โ PARP enzymes consume NAD+ to repair DNA breaks; chronically elevated DNA damage depletes NAD+ reserves. (3) Sirtuin signaling โ sirtuins regulate hundreds of downstream targets including PGC-1ฮฑ (mitochondrial biogenesis), FOXO transcription factors (stress resistance), and p53 (cell cycle). They require NAD+ as an obligate substrate.
The CD38 problem: CD38 is an NADase enzyme that rises with age and inflammation. It consumes massive amounts of NAD+ during immune activation. Chronic low-grade inflammation โ increasingly common with age โ creates a continuous NAD+ drain via CD38. This is why anti-inflammatory interventions and NAD+ supplementation may be synergistic.
| Research Area | Evidence Level | Key Findings |
|---|---|---|
| Animal longevity | Strong | Life extension, metabolic improvements in multiple rodent studies |
| Muscle function | Human data emerging | Improved muscle mass and function in aging populations |
| Cognitive function | Moderate (animal + early human) | Neuroprotective effects; Alzheimer's models show benefit |
| Metabolic health | Moderate human | Improved insulin sensitivity, mitochondrial function markers |
| DNA repair | Strong (mechanistic) | PARP activity and repair efficiency restored with NAD+ repletion |
| Cardiovascular | Moderate (animal) | Cardiac function improvements in aging and heart failure models |
| Phase | Dose | Frequency | Notes |
|---|---|---|---|
| Loading | 500mg | Daily ร 5โ10 days | SubQ preferred; IV requires slow drip |
| Maintenance | 250โ500mg | Weekly or bi-weekly | Maintain elevated tissue levels |
| Reconstitution | 2โ5 mL sterile water | Per vial | Light-sensitive; store dark |
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