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Reviewed by MyPeptideMatch Editorial TeamLast reviewed February 2026Updated February 2026

NAD+ Dosing Protocol: 500 mg Vial — IV & Subcutaneous Anti-Aging Guide

NAD+ (nicotinamide adenine dinucleotide) 500 mg vial dosing guide for IV infusion and subcutaneous injection protocols for cellular energy, sirtuin activation, and longevity.

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Quickstart highlights

NAD+ (nicotinamide adenine dinucleotide) is an essential coenzyme in cellular energy metabolism, declines approximately 50% between ages 40 and 60 in human tissue.

  • Concentration: 25 mg/mL (500 mg vial + 20 mL bacteriostatic water).
  • IV loading: 250 mg in 250 mL saline over 2–3 hours; SC maintenance: 50 mg (2 mL) daily.
  • Elhassan et al. 2019: IV NAD+ 3 mg/kg → 5-fold whole-blood NAD+ increase at 9 hours.
  • Infuse IV slowly (2–3 hours minimum) to avoid chest tightness and flushing.
  • Degrades faster in solution — use within 14 days; store lyophilized at -20 °C.

Dosing table

For educational reference only. Your prescribing provider may adjust doses based on your clinical profile and response.

WeekDose (µg)UnitsFrequencyNotes
1 (4-day loading)——IV infusion daily x 4 days250 mg IV in 250 mL saline over 2–3 hours; loading phase; one 500 mg vial covers 2 loading IV doses
2-12 (maintenance)——IV 1x/week or SC 50 mg dailyIV: 100 mg in 100 mL saline over 1 hour weekly; SC alternative: 50 mg (2 mL at 25 mg/mL) daily

Reconstitution steps

  1. Draw 20 mL bacteriostatic water; reconstitute slowly by swirling — do not shake.
  2. Final concentration: 25 mg/mL. For IV: dilute further in 100–250 mL normal saline.
  3. For SC use: at 25 mg/mL, 50 mg = 2 mL — use a 3 mL syringe.
  4. Label with date; refrigerate at 2–8 °C. Use within 14 days (NAD+ degrades faster in solution than typical peptides).

Supplies needed

4_day_iv-week plan

  • 1 vial
  • 4 syringes
  • — mL bac water
  • — alcohol swabs
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Protocol overview & cycle notes

Restore systemic NAD+ levels, activate sirtuins (SIRT1-7) and PARP repair enzymes, enhance mitochondrial energy production, and reduce epigenetic age acceleration through IV or subcutaneous NAD+ administration.

Off-cycle: Ongoing as needed; standard practice is 1–2 IV infusions monthly or daily SC for continuous NAD+ optimization.

Storage & handling

Lyophilized NAD+: store at -20 °C. Reconstituted: refrigerate 2–8 °C; use within 14 days. NAD+ in solution degrades to nicotinamide and AMP — use fresh reconstitution for IV infusions. Protect from light.

Injection & tracking tips

  • IV infusion: infuse over 2–3 hours minimum (250 mg in 250 mL saline) — rapid infusion causes chest tightness, flushing, and nausea; slow infusion rate eliminates most adverse effects.
  • Subcutaneous NAD+ (2 mL at 25 mg/mL for 50 mg dose): inject in the abdomen or outer thigh; local skin warmth and mild flushing are expected and transient.
  • The IV route provides superior peak plasma NAD+ levels; SC provides sustained, lower-peak delivery — both are used in clinical practice.

Tracking

Logging helps you and your provider spot patterns and adjust dose or timing.

  • Measure whole blood NAD+ levels (SpectraCell or similar lab) at baseline and after loading course to confirm repletion.
  • Track fatigue (Fatigue Severity Scale, FSS), cognitive clarity (0–10), and sleep quality weekly.
  • Monitor liver function tests (ALT, AST) at baseline and 12 weeks — NAD+ is heavily involved in hepatic energy metabolism.
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How this works & references

NAD+ (nicotinamide adenine dinucleotide) is an essential coenzyme in cellular energy metabolism, declines approximately 50% between ages 40 and 60 in human tissue. Restoration of NAD+ activates: (1) Sirtuin deacylases (SIRT1-3) driving epigenetic rejuvenation, mitochondrial biogenesis (SIRT1-PGC1alpha), and inflammatory modulation; (2) PARP-1/2 DNA repair enzymes; (3) CD38 NADase regulation. Elhassan et al. (2019, Cell Reports) demonstrated IV NAD+ 3 mg/kg over 3 hours significantly increased whole blood NAD+ by 5-fold at 9 hours in healthy participants. Martens et al. (2023, Nature Aging) showed NMN (NAD+ precursor) supplementation improved muscle NAD+ levels and insulin sensitivity in overweight elderly men.

Frequently asked questions

Is IV NAD+ better than oral NMN or NR supplements?
IV NAD+ produces the fastest and highest plasma NAD+ peak — documented 5-fold increase within hours (Elhassan et al.). Oral NMN and NR supplements raise whole blood and tissue NAD+ more modestly (1.4–2.2 fold) but are far less invasive and more convenient for daily use. Many practitioners use IV loading (500–1,000 mg over 4 days) then switch to oral NMN/NR for maintenance.
Why does IV NAD+ cause chest tightness and flushing?
NAD+ infused rapidly into peripheral veins causes local and systemic vasodilation (through PARP-1 activation in vascular endothelium and niacin receptor (GPR109A) stimulation, similar to niacin flushing). Slowing the infusion rate to 250 mg over 2–3 hours dramatically reduces these symptoms. Pre-treating with aspirin 325 mg 30 minutes before infusion further reduces flushing via prostaglandin inhibition.
How many IV vials do I need for the 4-day loading protocol?
At 250 mg per IV session x 4 days = 1,000 mg total. One 500 mg vial = 2 IV sessions. Therefore: 2 vials for a complete 4-day loading course at 250 mg/day.
How long does the NAD+ boost last after IV infusion?
Whole blood NAD+ elevation from IV infusion returns to near-baseline within 24–48 hours. Intracellular tissue NAD+ (the pharmacologically relevant compartment) persists longer due to slower turnover, with effects on sirtuin activity and energy metabolism detectable for 5–7 days. Maintenance infusions weekly or oral precursor supplementation daily are used to sustain elevation.
Can NAD+ injection help with addiction or mental health?
IV NAD+ has been promoted for opioid and alcohol detoxification in addiction medicine clinics. Proponents suggest NAD+ replenishment reduces withdrawal symptoms and craving by restoring neurotransmitter balance and mitochondrial function in neurons. Controlled trial evidence is limited; case series and observational data suggest benefit, but no phase 2 RCT has been completed in substance use disorder as of 2026.

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This content is for informational purposes only and does not constitute medical advice. Consult a licensed healthcare provider before starting any peptide therapy. Dosing and protocols may vary by formulation and prescriber.

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