Library / Peptides / Longevity & Anti-Aging / NAD+

Emerging evidence · Grade B

NAD+

NAD+ (Nicotinamide Adenine Dinucleotide)

Evidence

Emerging

Route

Intravenous, Subcutaneous injection, or Oral (precursor supplements)

Frequency

IV: 1-4 sessions over 1-2 weeks; Oral precursors: daily

Mechanism.

NAD+ is a critical coenzyme found in every living cell, essential for hundreds of metabolic reactions including energy production, DNA repair, and sirtuin activation. NAD+ levels decline significantly with age, and restoring these levels has become a major focus of longevity research. NAD+ can be supplemented directly via IV infusion or boosted indirectly through precursors like NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside).

NAD+ is like the battery that powers your cell's repair and energy systems. As you age, your cells drain this battery faster and recharge it slower. Restoring NAD+ levels is essentially recharging the battery so your cellular maintenance crews have the energy to do their jobs properly.

Mechanism · technical

NAD+ serves as an essential cofactor for sirtuins (SIRT1-7), which are deacetylase enzymes that regulate aging, inflammation, and stress resistance. It is also a substrate for PARPs (poly-ADP-ribose polymerases), which are critical for DNA repair. NAD+ participates in redox reactions in the mitochondrial electron transport chain, directly driving ATP production. CD38, an NAD+-consuming enzyme that increases with age, is a major driver of age-related NAD+ decline.

Part 02 · Dosing & administration

How it's taken.

Values below describe how NAD+ has been administered in published trials and labeling. Provided for educational purposes only — this is not medical advice and not instructions for self-administration. Consult your healthcare provider before making any health decision.

Standard dose

250-750 mg IV; 250-1000 mg oral (NMN/NR precursors)

Intravenous, Subcutaneous injection, or Oral (precursor supplements) · IV: 1-4 sessions over 1-2 weeks; Oral precursors: daily

Duration

IV: periodic infusion courses; Oral: ongoing

IV NAD+ infusions are slow (2-8 hours) due to flushing and chest tightness at faster rates. Oral precursors (NMN, NR) have better tolerability. Not FDA-approved for any indication.

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Part 03 · Safety

Side effects, rare serious events, who shouldn't.

Reported side effects

IV NAD+ infusions commonly cause chest tightness, nausea, cramping, and a sensation of pressure during administration; these are typically dose-rate dependent and resolve by slowing the infusion. Oral precursors (NMN, NR) are generally well-tolerated with occasional GI discomfort, flushing, and headache. A theoretical concern exists regarding NAD+ supplementation potentially fueling cancer cell metabolism in individuals with existing malignancies, though this remains under investigation.

Absolute · do not use

Known hypersensitivity to NAD+ or any component

Active malignancy (NAD+ supports cancer cell metabolism; theoretical concern)

Pregnancy or breastfeeding

Gout (NAD+ metabolism may increase uric acid levels)

Interactions

Chemotherapy agents

NAD+ supports DNA repair which may reduce efficacy of DNA-damaging chemotherapy

Major

Alcohol

Alcohol depletes NAD+; supplementation may alter alcohol metabolism but does not protect against liver damage

Minor

PARP inhibitors (olaparib)

PARP inhibitors rely on NAD+ depletion in cancer cells; NAD+ supplementation may oppose their mechanism

Major

Niacin (vitamin B3)

Both increase NAD+ levels; additive flushing and potential liver stress at high doses

Minor

Labs to monitor

CMP (Comprehensive Metabolic Panel)

Baseline and every 3 months

Liver and kidney function during IV NAD+ therapy

CBC with Differential

Baseline and every 6 months

General safety monitoring

Uric Acid

Baseline and at 4 weeks

NAD+ metabolism produces uric acid as byproduct

Fasting Glucose & Insulin

Baseline and every 3 months

NAD+ and sirtuins affect glucose metabolism

Part 04 · Research log

Every study we cite.

Each study with its published finding and a plain-language note on limitations or funding.

2019

NAD+ metabolism and its roles in cellular processes

NAD+ decline is a hallmark of aging; restoring NAD+ levels improved healthspan markers in animal models

Comprehensive review; strong mechanistic basis

PMID 30651490 ↗

2018

NR supplementation in humans

Nicotinamide riboside safely increased NAD+ levels in healthy middle-aged adults

Small RCT; well-designed; ChromaDex-funded

PMID 29184669 ↗

Part 05 · Cost & access

Where you can get it.

Regulatory status

NAD+ itself is not FDA-approved as a drug. IV NAD+ infusions are offered at clinics as an off-label or wellness treatment. NMN and NR are sold as dietary supplements. The FDA briefly challenged NMN's supplement status in 2022 but the situation remains in flux. NAD+ is not a controlled substance.

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Part 06 · Your appointment

Questions to bring.

Should I pursue IV NAD+ or oral precursors (NMN/NR), and what are the trade-offs?

What are my current NAD+ levels and how can they be tested?

How does NAD+ supplementation interact with cancer biology?

What dosing protocol and duration is supported by the evidence?