NAD+ dosing & administration
Your cells' master energy currency and anti-aging powerhouse—NAD+ keeps your mitochondria humming, activates longevity genes called sirtuins, and helps repair DNA damage that accumulates as you get older.
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Dosing
How much do I take?
Intravenous: Delivered straight into a vein through a drip (IV), done by a clinician.
Bioavailability Complete (about 100%) — delivered straight into the bloodstream.
500 mg NAD+ in 500 mL saline
Frequency
Per infusion — run time is the critical setting, not the milligrams
Duration
Studied as 4 consecutive days; no established schedule
Source class: clinical practice. The milligrams alone do not describe this dose; the published studies also state how fast it went in. In the tolerability study, all 6 people (6 of 6, 100%) receiving 500 mg reported moderate to severe abdominal cramping, diarrhoea, nausea, vomiting, increased heart rate, throat pain, congestion and chest pressure during infusion, against 5 of 8 reporting minor tingling and mild cramping on nicotinamide riboside. Participants set their own rate by tolerance; average total infusion time was 97 minutes for NAD+ and 37 minutes for NR [6]. A separate study infused NAD+ at 3 micromoles per minute over 6 hours [7]. Three hours after infusion, blood NAD+ was significantly higher in the NR group than the NAD+ group [6].
Timing
Best time to take
Morning is generally recommended for oral NAD+ precursors since they can boost energy and alertness. Some people find afternoon doses interfere with sleep. IV infusions can be done anytime but plan for 2-4 hours.
With food?
NAD+ precursors can be taken with or without food. Some people find taking with food reduces any digestive upset. Fat-soluble companions like resveratrol absorb better with a meal containing healthy fats.
If stacking
NAD+ precursors pair beautifully with sirtuin activators like resveratrol and quercetin—they work synergistically. CoQ10 and PQQ support the same mitochondrial health pathways. Space supplements 30 minutes apart if taking multiple.
Adjusting your dose
Increase if
- You've used the starting dose for 4+ weeks with good tolerance
- You want more noticeable energy or cognitive benefits
- Research suggests higher doses for your specific goals
Decrease if
- You experience persistent flushing or skin reactions
- Digestive upset doesn't resolve after the first week
- You feel overly stimulated or have trouble sleeping
- Any side effect concerns you
Signs of right dose
- Sustained energy throughout the day without crashes
- Mental clarity and focus feel improved
- Better exercise recovery
- Improved sleep quality (despite daytime energy)
Administration
How do I use it?
Reconstitution
What you need
Injection
Route
Intravenous (IV) infusion is most common for direct NAD+; subcutaneous or intramuscular injections are less common but sometimes used
Best sites
Storage
Before reconstitution
Store NAD+ powder in the refrigerator at 36-46°F (2-8°C). For oral supplements (NR, NMN), a cool, dry place works, but refrigeration extends shelf life. Keep away from light and moisture.
After reconstitution
Reconstituted NAD+ solutions should be refrigerated and used within 14-21 days. Never freeze. Discard if solution becomes cloudy, discolored, or contains particles.
Signs of degradation — discard the vial
Sample daily schedule
Morning (with breakfast)
250-500 mg oral precursor (NR or NMN) injection
Site: Oral administration
Taking in the morning supports daytime energy and avoids potential sleep interference. Can be taken with food to reduce any digestive upset. This is the most common daily protocol.
Scheduled appointment (for IV)
250-500 mg NAD+ IV infusion injection
Site: IV in arm vein
IV sessions are typically done weekly to monthly depending on goals. Plan for 2-4 hours. Eat a light meal beforehand and stay well-hydrated.
Safety
Is it safe?
Side effects
Commonly reported: Flushing and warmth, Digestive upset, Mild headache
Less common: Increased energy or restlessness, Vivid dreams
Stop and seek help if
- Any signs of allergic reaction—difficulty breathing, severe rash, swelling
- Persistent digestive problems that don't improve after 2 weeks
- Severe or persistent headaches
- Heart palpitations or significant changes in heart rhythm
- If you develop any condition where NAD+ is contraindicated (like cancer diagnosis)
- Side effects that concern you or affect quality of life
NAD+ supplements and infusions are not FDA-approved for treating any medical condition. The information provided is for educational purposes only. Always consult with a qualified healthcare provider before starting, stopping, or changing any supplement regimen.
Flagged pairings
- Chemotherapy drugs — Theoretical concern that boosting cellular energy could benefit cancer cells. Always consult your oncologist before using NAD+ during cancer treatment.
- High-dose niacin — Use caution—combining NAD+ precursors with high-dose niacin may cause excessive flushing. One or the other is usually sufficient.
Published research
What the studies show
Vinten KT, Trætowicz MM, Coskun E · 2025
This comprehensive review evaluated human clinical trials of NAD+ precursors, finding that while NAD+ levels clearly decline with age, the clinical benefits of supplementation in humans are still being established. The review highlights the need for larger, longer trials.
Yu X, Xu J, Cao J · 2026
In 180 heart failure patients, IV NAD+ significantly improved heart function (ejection fraction) compared to placebo. Patients also showed trends toward fewer hospitalizations and better functional capacity, suggesting NAD+ may help struggling hearts.
Berven H, Kverneng S, Sheard E · 2023
A phase I randomised, double-blind trial in 20 people with Parkinson's disease, split 10 on nicotinamide riboside 1,500 mg twice daily (3,000 mg/day) and 10 on placebo, for four weeks. All 20 completed. The primary outcome was the frequency of moderate and severe adverse events: there were none, and mild adverse events did not differ significantly between the two groups. Blood NAD+ rose up to 5-fold. NR recipients showed a slight initial rise in serum homocysteine. Total MDS-UPDRS scores improved, but that change was also associated with a shorter interval since the last levodopa dose. The authors support extending the dose range to 3,000 mg/day in phase II with safety monitoring.
Wang DD, Airhart SE, Zhou B · 2022
A 30-participant trial in patients with clinically stable heart failure with reduced ejection fraction, given nicotinamide riboside 1,000 mg twice daily (2,000 mg/day). NR appeared safe and well tolerated and approximately doubled whole blood NAD+. Within individuals, the rise in NAD+ correlated with increased basal (R2 = 0.413, P = 0.003) and maximal (R2 = 0.434, P = 0.002) respiration in peripheral blood mononuclear cells, and with decreased NLRP3 expression (R2 = 0.330, P = 0.020). The trial reports safety and tolerability; it was not designed to measure whether heart failure outcomes improved.
Szarvas Z, Reyff ZA, Peterfi A · 2025
In older adults with blood vessel disease, 4 weeks of NAD+ precursor supplementation improved brain blood vessel function and cognitive performance across multiple domains. The supplement also reduced oxidative stress in blood vessel cells.
Reyna K, et al. · 2026
Clients received 500 mg lyophilized NAD+ (or NR) in 500 mL saline IV on four consecutive days; NAD+ infusions averaged ~97 minutes with GI symptoms prompting slower rates.
Grant R, Berg J, Mestayer R, Braidy N, Bennett J, Broom S, Watson J · 2019
NAD+ was infused intravenously at 3 micromoles per minute for 6 hours. Plasma NAD+ and its metabolites (nicotinamide, methylnicotinamide, ADP-ribose, nicotinamide mononucleotide) did not change until after 2 hours. Increased urinary excretion of methylnicotinamide and NAD+ was detected at 6 hours, with no significant rise in urinary nicotinamide.
Head to head
NAD+ compared
Want the full picture?
The complete NAD+ research profile: mechanism of action, clinical studies, effectiveness timeline, and FAQ.