NAD+ / NMN / NR
Nicotinamide Adenine Dinucleotide and its Precursors (NMN, NR)
NAD+ is a coenzyme essential to energy metabolism and DNA repair. It declines ~50% between ages 40 and 60, driving intense research into oral and IV precursors that restore it.
NR (nicotinamide riboside) and related NAD+ precursors are widely sold as dietary supplements for human consumption. NMN's regulatory status is evolving — the FDA has indicated it may not qualify as a dietary supplement due to prior drug investigation; consult current FDA guidance for the latest status. This page is for educational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use.
What it is
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme present in every cell in the body. It is central to the mitochondrial electron transport chain (energy production), DNA repair, and the activation of sirtuins — a family of proteins associated with longevity and stress resistance.
NAD+ cannot be taken directly in an orally bioavailable form that meaningfully raises cellular levels. Instead, two precursors are used: NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside). Both convert to NAD+ intracellularly through slightly different pathways. The debate over which is more effective — and whether oral supplementation meaningfully raises tissue NAD+ — is one of the most active in longevity research.
IV NAD+ infusions bypass the bioavailability question entirely and are increasingly common in clinical longevity settings, though they are expensive and not well-studied in controlled trials.
What research shows
- NAD+ declines significantly with age — roughly 50% between ages 40 and 60 in human tissue
- NMN and NR both raise blood NAD+ levels in human trials — tissue-level effects less confirmed
- Sirtuin activation downstream of NAD+ restoration is linked to metabolic and longevity benefits in animal models
- Life extension in multiple animal models (mice, worms) with NAD+ precursor supplementation
- Human trials showing improvements in muscle function, insulin sensitivity, and metabolic markers (results are modest)
- David Sinclair (NMN proponent) and Charles Brenner (NR researcher) represent the leading voices in the field
What remains unknown
- Whether blood NAD+ increases translate to meaningful cellular NAD+ restoration in target tissues
- Which precursor (NMN vs NR) is superior — no definitive head-to-head human trial exists
- Optimal dosing — human trials have used a wide range (250mg to 1000mg+ daily)
- Long-term safety profile — NAD+ is also a precursor to NAD+ consuming enzymes (PARPs, CD38) that degrade it
- Whether IV infusions produce meaningfully better outcomes than oral dosing
Administration basics
Common use cases
Longevity protocols, energy, metabolic health, cognitive function, healthy aging.
Half-life
NAD+ in blood has a half-life of minutes. NMN and NR convert to NAD+ within hours of ingestion.
Administration
Oral capsules (NMN or NR, typically 250–500mg daily). IV NAD+ infusions available at longevity clinics.
Research Protocols & Common Usage
Doses used in research
- NMN human trials have used 250–500mg/day orally; some researchers use 1g/day
- NR human trials have used 250–1000mg/day
- IV NAD+ infusion clinics commonly use 500–1000mg per infusion session
Administration routes studied
Typical protocol duration
Most human trials have run 8–12 weeks. Community and longevity practitioner use is often long-term and ongoing.
Common stacking protocols
- NMN/NR + Resveratrol — popularized by David Sinclair; resveratrol proposed to activate sirtuins that require NAD+ as a cofactor
- NMN/NR + TMG (Trimethylglycine) — TMG added to offset potential methylation burden
- NAD+ + Methylene Blue — combined in mitochondrial optimization protocols
Contraindications & combinations to avoid
- Active cancer — NAD+ is required for cancer cell energy production; boosting NAD+ may theoretically support cancer cell survival; consult an oncologist
- High-dose niacin (nicotinic acid) — overlapping NAD+ pathway; may cause flushing or other niacin-associated effects
- Blood thinners — some research suggests potential effects on platelet function at high doses; consult a physician
Dosing information reflects doses used in published research and commonly reported community protocols only. This is not a personal recommendation. These compounds are not FDA-approved for human use in the contexts described. Consult a qualified healthcare provider before starting any protocol.
Considering stacking?
See the stacking guide for common combinations with NAD+ / NMN / NR and what to avoid.
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