NAD+ Dosage Guide: Protocols, Calculator & Safety
Everything you need to know about NAD+ dosing — protocols, safety, and where to buy.
Dose Range
50,000–500,000 mcg (50–500 mg) per injection; higher for IV infusions
Frequency
2–3 times per week subcutaneous; weekly-monthly IV infusions
Cycle Length
4–12 weeks; many use ongoing maintenance dosing
Half-Life
Varies by form: NR ~8 hours plasma; NMN ~1-2 hours plasma; IV NAD+ infusion dose-dependent
Administration Routes
Quick Reconstitution Calculator
Calculate syringe units instantly
Syringe Draw
10.0 units
2500 mcg/ml · 0.100 ml draw
Dosing Protocols
NAD+ Precursor Beginner Protocol
Choose ONE precursor initially to establish baseline response:
Option 1 — NR (Nicotinamide Riboside, most-validated)
- 300 mg once daily with breakfast
- 4 weeks at this dose to assess tolerance
- Then escalate to 500 mg daily if well-tolerated
Option 2 — NMN (Nicotinamide Mononucleotide)
- 250 mg once daily with breakfast
- 4 weeks at this dose to assess tolerance
- Then escalate to 500 mg daily if well-tolerated
Option 3 — NAM (Nicotinamide)
- 500 mg once daily with breakfast
- Pair with 500 mg TMG (trimethylglycine) to offset methyl group consumption
- 4 weeks at this dose to assess tolerance
Why NOT direct IV NAD+ as a beginner protocol: IV NAD+ requires a clinical setting, costs $200-500 per session, and has less controlled trial evidence than oral precursors. Starting with oral is more cost-effective and better-validated.
Common counseling points
- Take with breakfast or early lunch; NAD+ precursors can be mildly stimulating
- Consistent daily dosing matters more than time-of-day precision
- No measurable improvement is expected in the first 2 weeks; most users report subtle energy/cognitive effects at 4-6 weeks
- Consider baseline blood work before starting (NAD+ levels from ChromaDex or TRU Niagen labs; optional)
NAD+ Precursor Intermediate Protocol
- NR: 500-1,000 mg daily (split AM and early PM if using higher dose)
- NMN: 500-600 mg daily (Liao et al. suggested 600 mg as practical ceiling for athletic performance endpoint)
- Combined: 300 mg NR + 300 mg NMN daily if pursuing both precursor pathways
Add methylation support for higher doses
- TMG (betaine) 500-1,500 mg daily
- Folate (5-MTHF) 400-800 mcg daily
- B12 (methylcobalamin) 500-2,000 mcg daily (higher if serum B12 <400 pg/mL)
Performance/longevity stack
- NR 500 mg AM + NMN 500 mg AM (with food)
- TMG 500 mg AM
- Apigenin 100-200 mg AM (CD38 inhibition support)
- Resveratrol 500 mg with fat AM
- Creatine monohydrate 5 g daily (mitochondrial energy support)
Duration and expectations
- Subjective effects plateau by 8-12 weeks
- Blood NAD+ levels increase within 2-4 weeks
- Continuing long-term at maintenance dose is the common pattern
- Intermittent protocols (8 weeks on, 4 weeks off) are used by some but have no specific evidence basis
NAD+ Precursor Advanced Protocol
- NR 1,000-2,000 mg daily (split AM + midday; 2,000 mg has 12-week safety data from Dollerup 2018)
- OR NMN 900 mg daily (Liao 2021 supported safety at this dose over 6 weeks)
- Plus methylation stack: TMG 1,000 mg, 5-MTHF 800 mcg, methylcobalamin 2,000 mcg, choline 500 mg
- Plus apigenin 200 mg for CD38 inhibition
- Plus IV NAD+ 500 mg monthly if pursued at a longevity clinic
Monitoring for advanced use
- Annual metabolic panel plus homocysteine (confirms methylation not compromised)
- Serum methylmalonic acid (B12 functional status)
- Fasting glucose and HbA1c (niacin-family can worsen glucose; less concern with NR/NMN)
- NAD+ levels via specialty lab annually
IV NAD+ Clinical Context
- Typical infusion: 500-1,500 mg over 2-4 hours
- Cost: $200-500 per session at longevity clinics
- Protocols: loading (3-5 consecutive days or 1x weekly × 4 weeks), then monthly maintenance
- Most common reported experience: fatigue reduction, improved sleep quality, perceived cognitive clarity at 24-72 hours post-infusion
- Evidence base: substantially smaller than oral precursors; primarily open-label case series and addiction medicine literature
Caveat about ceiling
There is no established dose where additional NAD+ precursor provides more benefit. Plasma NAD+ response plateaus in most studies around 500-1,000 mg/day of NR or NMN. Dollerup's 2,000 mg NR did not produce metabolic improvements despite higher plasma NAD+. Higher doses increase cost without clear added benefit.
Weight-Based Dosing
Commonly Stacked With
NR + TMG (trimethylglycine / betaine) — Addresses the methyl-group concern by providing dietary methyl donor support. Typical stack is 300-600 mg NR plus 500-1,000 mg TMG daily. Particularly useful for those using NR at higher doses (>1,000 mg/day) or with elevated homocysteine.
NMN + resveratrol — Sinclair-lab-popularized stack. Resveratrol is a sirtuin activator (weak, controversial); NMN provides sirtuin substrate. Logic is complementary rather than redundant. Dose: 500-1,000 mg NMN plus 500-1,000 mg trans-resveratrol with fat (for absorption).
NR + pterostilbene — Chromadex's "Basis" formulation. Pterostilbene is a methylated resveratrol analog with better bioavailability. NR provides NAD+ substrate; pterostilbene activates sirtuins.
NAD+ precursors + apigenin (CD38 inhibition) — Apigenin (50-200 mg) weakly inhibits CD38, reducing NAD+ degradation. Combined with NR or NMN, the effect is theoretically additive — precursor provides substrate while apigenin slows breakdown.
NAD+ precursors + urolithin A — Urolithin A (Mitopure, 500 mg) activates mitophagy independent of NAD+; pairing addresses mitochondrial quality control alongside NAD+ restoration.
Avoid
- Large simultaneous doses of NR + NMN — redundant, wastes money, no synergy since both feed the same NAD+ pool
- High-dose NAM (>1,500 mg) without concurrent methyl donor support (folate, B12, TMG, choline)
- Timing NAD+ precursors after 3 PM if sleep-sensitive (they can be mildly stimulating)
- IV NAD+ plus high-dose oral precursors same-day — no demonstrated added benefit
See the complete nootropic stack guide for integration with other longevity interventions.
Related Compounds — Deeper Research Paths — Direct NAD+ infusion/injection is the most invasive NAD-restoration route. Oral precursors are more practical: NMN (one step from NAD+, direct precursor) and nicotinamide riboside. Mitochondrial adjuncts that complement NAD+ restoration: CoQ10 (electron transport), Methylene Blue (Complex I bypass), SS-31 (cristae stabilization), MOTS-c (mitochondrial-derived peptide), and Urolithin A (mitophagy). For sirtuin substrate availability: L-Carnitine and Glutathione. Longevity-stack partners: Rapamycin (mTOR inhibition), Epithalon (telomerase), Fisetin (senolytic).
Related Guides — Nasal Spray Deep Dives — Intranasal NAD+ is a newer delivery route claimed to bypass first-pass metabolism. For the intranasal-peptide evidence hierarchy (note: NAD+ is a cofactor, not a peptide — included here because intranasal NAD+ products are part of the same category), see the 2026 Best Peptide Nasal Sprays guide. For DIY reconstitution, see How to Make a Peptide Nasal Spray at Home. For reconstitution ratios across injectables and intranasal forms, see the Complete Peptide Reconstitution Guide.
Side Effects & Safety
Contraindications
**Absolute contraindications (systemic NAD+ precursor use)** - Active malignancy under treatment — discuss with oncology team; theoretical concern about NAD+ supporting tumor DNA repair during chemotherapy stress - Known hypersensitivity to the specific formulation - Pregnancy and breastfeeding — no safety data for elevated-dose supplementation beyond dietary adequacy **Relative contraindications** - Peptic ulcer disease — high-dose niacin specifically can worsen; NR/NMN less concerning - Active gout or significant hyperuricemia — high-dose niacin risk; NR/NMN less concerning - Uncontrolled diabetes — niacin worsens glucose; NR/NMN may improve glucose (Yoshino 2021) - Severe hepatic impairment — hepatic NAD+ metabolism may be impaired - Concurrent anti-seizure medications (valproate) — methyl donor interactions with NAM specifically **IV NAD+ specific contraindications** - Severe cardiovascular disease or unstable angina (chest tightness during infusion) - Active psychosis or severe anxiety disorder - Pregnancy - Active substance withdrawal without medical supervision **Regulatory status** - **NR**: Generally Recognized As Safe (GRAS) in the US; legal dietary ingredient in EU, UK, Canada, Australia - **NMN**: FDA in October 2022 determined NMN is excluded from dietary supplement status in the US; enforcement has been inconsistent. Legal status varies by country. - **NAM (nicotinamide)**: legal dietary supplement worldwide - **NA (nicotinic acid / niacin)**: legal dietary supplement; prescription formulations exist for lipid indications - **IV NAD+**: compounded by 503A pharmacies for specific patients; not FDA-approved as a drug product **WADA**: NAD+ precursors are not specifically prohibited for athletes; dietary supplement status applies.
Additional Notes
Bioavailability comparison
- NR: ~10% oral bioavailability (highest among oral precursors); reliable NAD+ elevation
- NMN: bioavailability depends on whether Slc12a8 transport or CD73 conversion to NR is dominant in the individual's tissues; likely similar net effect to NR
- NAM: high oral bioavailability but NAMPT rate-limiting; also consumes methyl groups
- NA: high bioavailability; Preiss-Handler pathway; flushing limits dose escalation
- IV NAD+: 100% bioavailability but likely degraded extracellularly before tissue uptake
Timing: morning dosing is the consensus. NAD+ precursors can be mildly stimulating; late-day dosing may disrupt sleep in sensitive individuals. With-food dosing reduces GI upset; no specific absorption benefit from food timing has been demonstrated.
Dose-response: plasma NAD+ rises approximately dose-proportionally for NR and NMN up to ~1,000 mg/day, then plateaus. Clinically meaningful subjective or metabolic effects do not clearly scale beyond 500-1,000 mg/day based on available RCT data.
Storage: NR (Niagen) is stable at room temperature. NMN should be stored in a cool, dry place; some sources recommend refrigeration due to its inherent instability at higher temperatures. Both precursors should be kept in original sealed containers to protect from moisture.
Cost and sourcing
- NR: $30-80 per month at 300-500 mg/day
- NMN: $40-150 per month at 250-500 mg/day; quality varies significantly between brands
- NAM: $5-20 per month (cheapest)
- IV NAD+: $200-500 per clinical session
Quality verification: third-party testing (e.g., Examine.com verified, NSF Certified) is worth seeking given significant brand-to-brand quality variability for NMN in particular. Chromadex's Niagen (NR) and Shinkowa/MIRAI (NMN) have the most rigorous quality controls.
Where to Buy NAD+
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Frequently Asked Questions
What is the recommended NAD+ dosage?
The typical dose range for NAD+ is 50,000–500,000 mcg (50–500 mg) per injection; higher for IV infusions. It is usually administered 2–3 times per week subcutaneous; weekly-monthly IV infusions. Always start with the lowest effective dose.
How often should I take NAD+?
2–3 times per week subcutaneous; weekly-monthly IV infusions
Does NAD+ need to be cycled?
Yes, typical cycle length is 4–12 weeks; many use ongoing maintenance dosing.
What are NAD+ side effects?
**Nicotinamide Riboside (NR)** NR has the best-characterized safety profile of the NAD+ precursors. Across published RCTs at 1,000-2,000 mg/day for up to 12 weeks, adverse effects have been mild and uncommon: - Gastrointestinal upset (5-10% of users) - Mild headache - Fatigue or drowsiness (uncommon) - Insomnia if dosed late in the day No serious adverse events have been reported in pooled analyses. **Nicotinamide Mononucleotide (NMN)** NMN safety data is more limited than NR but reassuring in published trials: - Similar GI upset profile to NR - Mild flushing or warmth at higher doses (uncommon) - Single-dose studies up to 500 mg well-tolerated; longer-term 250-900 mg daily studies have not identified concerning signals **Nicotinamide (NAM)** Broad safety at typical doses (250-1,500 mg/day). Key concerns at higher doses: - **Methyl-group consumption**: NAM is metabolized by NNMT using S-adenosylmethionine (SAM) as methyl donor; chronic high NAM doses may deplete methylation substrate if dietary methyl donors (folate, B12, choline, betaine) are inadequate - **Hepatotoxicity**: rare but documented at doses >3,000 mg/day - **Sirtuin inhibition paradox**: NAM is a weak direct inhibitor of sirtuins at very high concentrations (in vitro); whether this matters at physiologic dietary doses is uncertain **Nicotinic Acid (NA / Niacin)** - **Cutaneous flushing**: prostaglandin D2-mediated, dose-dependent, resolves with continued use. Extended-release formulations reduce flushing. - **Hepatotoxicity**: extended-release formulations have greater hepatic toxicity risk than immediate-release - **Hyperglycemia**: high-dose niacin worsens glucose tolerance; caution in diabetes - **Hyperuricemia**: may precipitate gout **IV NAD+** - **Chest pressure or tightness** during infusion (dose-dependent; slow infusion rate reduces this) - **Flushing or warmth** during infusion - **Nausea or vomiting** if infused too rapidly - **Headache** post-infusion (common, 15-25%) These effects almost universally resolve with slower infusion rates; typical protocols infuse 500-1,500 mg over 2-4 hours. **Theoretical concerns across NAD+ precursors**: - **Cancer progression**: NAD+ fuels PARP-mediated DNA repair, which could theoretically support tumor cell survival under chemotherapy stress. Some preclinical data supports and some refutes this concern. Caution during active cancer treatment and discussion with oncology team is prudent. - **Insomnia from late-day dosing**: avoid dosing after 3 PM if sleep sensitivity occurs
Where can I buy NAD+?
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