NAD+: Cellular Energy, DNA Repair, and the Delivery Problem
A naturally occurring cellular coenzyme central to energy metabolism and DNA repair — sold as an IV, injectable, and oral longevity supplement.
What is NAD+?
NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme found in every living cell, central to mitochondrial energy production and DNA-repair enzyme activity. Cellular NAD+ levels decline with age, which has driven a wave of consumer interest in supplementing it directly via IV infusion, injection, or oral precursors. Unlike a conventional drug, NAD+ doesn't behave with a simple circulating half-life — it's rapidly taken up and used intracellularly. It's sold over-the-counter as an oral dietary supplement, and administered by IV or injection at wellness clinics, but it is not an FDA-approved drug for any indication, and anti-aging claims made about it are not FDA-evaluated.
Quick facts
- Molecular Formula
- C21H27N7O14P2
- Molecular Weight
- 663.43 g/mol
- CAS Number
- 53-84-9
- Class
- Cellular coenzyme / dietary supplement (not a peptide)
- Brand Names
- No trademarked brand — sold as a generic coenzyme supplement
- Legal Status
- OTC dietary supplement (oral); injectable/IV forms are clinic-compounded and not FDA-approved as a drug
- Category
- Longevity & Cellular Health
- Storage
- Store the lyophilized vial refrigerated (2-8°C) or at -20°C, away from light. Once reconstituted, keep refrigerated at 2-8°C and use promptly.
Dosing at a glance
Injectable NAD+ protocols vary widely by vendor and clinic; a common convention is a 500mg vial reconstituted with 5mL bacteriostatic water. IV infusion is typically clinic-prepared and administered over 1–4 hours. Run the numbers in the reconstitution calculator.
Doses shown are those reported in published research, not a recommendation.
NAD+ Mechanism of Action
Cellular Energy and DNA Repair
NAD+ is a coenzyme present in every living cell, acting as an electron carrier in mitochondrial ATP production and as a required substrate for sirtuin and PARP enzymes involved in DNA repair and cellular stress response. Because it is consumed continuously by these processes, cellular NAD+ pools decline measurably with age — the basis for interest in exogenous supplementation.
Delivery Routes
NAD+ is administered via IV infusion, subcutaneous or intramuscular injection, or oral capsule. Oral bioavailability of intact NAD+ is limited, which is part of why IV and injectable routes are popular at wellness clinics — they bypass first-pass gut metabolism, though direct comparative bioavailability data across routes in humans is limited.
NAD+ Dosage and Protocols
Route-Dependent Protocols
Injectable/subcutaneous protocols commonly use 50–100mg daily or a few times weekly. Clinic-administered IV infusions use much larger doses — 250–750mg — delivered slowly over 1–4 hours, since rapid IV infusion of NAD+ is associated with infusion-related discomfort (flushing, chest tightness, cramping) at high infusion rates.
NAD+ Side Effects and Safety
Infusion-Related Effects
The most commonly reported side effects are infusion-related — flushing, mild chest or abdominal tightness, cramping, or nausea, especially when IV NAD+ is administered too quickly. These typically resolve by slowing the infusion rate. Injectable/subcutaneous forms can cause local injection-site irritation. Long-term safety data at the doses used in wellness clinics remains limited.
NAD+ Research Evidence
Evidence Base
Most human evidence on raising NAD+ levels comes from studies of oral precursors (NMN, NR) rather than direct NAD+ administration, and even that literature is still early — small trials, short durations, and mixed results on hard clinical endpoints. Claims around IV/injectable NAD+ for energy, cognition, or longevity are largely anecdotal and clinic-marketed rather than backed by controlled human trials.
Regulatory and Legal Status
Oral NAD+ is available over-the-counter as a dietary supplement in the US. Injectable and IV NAD+ are typically compounded and administered at wellness clinics; the FDA has scrutinized NAD+ in recent compounding rulemaking discussions. NAD+ is not an FDA-approved drug for any indication, and longevity/anti-aging claims made about it have not been FDA-evaluated. Verify local compounding-pharmacy regulations before pursuing injectable/IV administration.
NAD+ Stacking and Combinations
Common Wellness Pairings
NAD+ is frequently offered alongside glutathione and B-vitamin injections at wellness/longevity clinics as part of broader IV-therapy menus, positioned as complementary cellular-health support rather than a peptide-stacking protocol in the traditional sense.
NAD+ Pharmacokinetics
Not a Conventional Drug Profile
NAD+ does not behave like a typical small-molecule drug with a defined plasma half-life — it is rapidly taken up by cells and consumed by intracellular enzymatic processes rather than circulating and being cleared systemically. This is part of why direct human pharmacokinetic data for exogenous NAD+ is sparse compared to its precursor compounds.
Contraindications
- pregnancy
- active malignancy
Frequently asked questions
What is a typical NAD+ dose?
Published research protocols report 50–750 mg, route-dependent. This is the range described in the literature, not a recommendation.
What is the half-life of NAD+?
Not a typical circulating half-life — rapidly taken up and metabolized intracellularly rather than persisting in plasma.
Is NAD+ backed by strong evidence?
NAD+ carries a REGEN research grade of C. REGEN Research Tier C — most supporting human data comes from precursors rather than from NAD+ itself.
How is NAD+ administered?
Routes reported in the literature: intravenous, subcutaneous, intramuscular, oral.
Who should avoid NAD+?
Contraindications noted in the literature include pregnancy, active malignancy.