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Nicotinamide Adenine Dinucleotide (NAD+)
Also known as: NAD, Nicotinamide Adenine Dinucleotide, NAD+ IV, NAD+ Injection
Confidence
Updated 2026-03-18
NAD+ (nicotinamide adenine dinucleotide) is a critical coenzyme present in every living cell, essential for energy metabolism, DNA repair, sirtuin activation, and cellular signaling. While not a peptide, it is ubiquitously offered by peptide therapy clinics as a peptide-adjacent infusion or injection for anti-aging, cognitive enhancement, and addiction recovery. NAD+ levels decline with age, driving interest in exogenous supplementation.
Class
Metabolic Cofactor
Routes
Intravenous, Subcutaneous, Intramuscular, Oral (precursors NMN/NR)
Half-Life
Intracellular half-life: ~1–2 hours (rapid turnover). IV infusion: cleared from plasma within minutes but intracellular effects may persist longer.
NAD+ serves as an electron carrier in mitochondrial oxidative phosphorylation (energy production), a substrate for sirtuins (SIRT1-7, which regulate gene expression, DNA repair, and longevity pathways), a substrate for PARPs (DNA repair enzymes), and a precursor for cyclic ADP-ribose (calcium signaling). Exogenous NAD+ IV infusion aims to restore depleted intracellular NAD+ pools, though the degree to which IV NAD+ enters cells versus being metabolized extracellularly is debated.
Half-Life
Intracellular half-life: ~1–2 hours (rapid turnover). IV infusion: cleared from plasma within minutes but intracellular effects may persist longer.
Bioavailability
IV: 100% (plasma availability). Actual intracellular bioavailability debated — NAD+ is a large charged molecule and may not freely cross cell membranes. Precursors (NMN, NR) may be more efficient for intracellular delivery.
No FDA-approved indications. Clinic use: anti-aging, cognitive clarity, fatigue, addiction recovery (alcohol, opioid), neurodegenerative disease support, athletic recovery.
Extensive basic science literature on NAD+ biology and aging (thousands of publications). Sirtuin/NAD+ research led to Nobel Prize–adjacent work. However, clinical evidence for exogenous NAD+ supplementation in humans is limited. Small studies suggest benefit in addiction recovery (BR+ NAD protocol). Oral precursors (NMN, NR) have more human trial data — NNMT study, Elysium BASIS trial. The assumption that IV NAD+ efficiently replenishes intracellular stores is not well-proven.
Human Studies
15
Animal Studies
200
IV infusion: commonly causes chest tightness, nausea, flushing, headache during infusion (usually rate-dependent — slowing infusion resolves symptoms). GI discomfort with oral precursors. Generally considered safe for acute use. Long-term safety of repeated high-dose IV NAD+ infusions not systematically studied.
Not FDA-regulated as a drug. IV NAD+ offered under medical supervision at wellness clinics. Oral precursors (NMN, NR) are dietary supplements. FDA sent warning letters to some companies making drug claims about NAD+ products.
Drug Interactions: Theoretical interaction with medications metabolized by NAD+-dependent pathways. May affect chemotherapy efficacy (cancer cells also use NAD+). Monitoring: Subjective symptom assessment. Some clinics measure intracellular NAD+ levels, though clinical utility is unvalidated. Research Gaps: Does IV NAD+ actually replenish intracellular pools efficiently? Oral precursors vs. IV — which is more effective? Long-term safety. Optimal dosing protocols. Cancer safety (NAD+ fuels all cells including tumors).
Intravenous infusion
Common Range
250–1000 mg per infusion
Timing
Typically morning, infusion over 2–4 hours (rate-limited by tolerability)
Frequency
Varies: daily loading (addiction protocols, 6–10 days) or weekly/monthly maintenance
Cycling
Loading: daily x 6–10 days (addiction). Maintenance: weekly to monthly.
Important Note
Not FDA-approved for any indication. Common infusion side effects are rate-dependent. Slow infusion rate to manage symptoms. Expensive ($500–1500+ per infusion).
Subcutaneous injection
Common Range
50–200 mg
Timing
Morning
Frequency
Daily to weekly
Cycling
Ongoing or pulsed courses
Important Note
SC injection is a lower-cost alternative to IV. Injection site stinging common. Bioavailability relative to IV not well characterized.
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Disclaimer: This content is for educational and informational purposes only and does not constitute medical advice. Always consult with a licensed healthcare provider before starting, stopping, or modifying any peptide therapy. PeptideSupplierMatch does not prescribe, sell, or distribute peptides.
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