NAD+
Nicotinamide Adenine Dinucleotide (NAD+)
NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme found in all living cells that plays a central role in cellular energy metabolism and is widely used as a supplement to support healthy aging, cognitive function, and energy levels. It has gained significant attention for its role in activating sirtuins and supporting DNA repair mechanisms that decline with age. Clinically, IV NAD+ infusions are used in addiction recovery and neurodegenerative disease support protocols, while oral and sublingual forms are popular for general wellness and longevity.
Mechanism of Action
NAD+ serves as an essential electron carrier in cellular respiration, shuttling electrons through the mitochondrial electron transport chain to generate ATP via oxidative phosphorylation. It acts as a critical substrate for sirtuin deacetylases (SIRT1-7), which regulate gene expression, inflammation, mitochondrial biogenesis, and stress resistance, as well as for PARP enzymes involved in DNA damage repair. NAD+ levels decline significantly with age and metabolic dysfunction, and supplementation—either directly or via precursors like NMN or NR—aims to restore these levels and reactivate these longevity-associated pathways.
Evidence by Health Goal(18 goals)
Dosing Protocols
Morning, with or without food
Oral bioavailability of NAD+ itself is debated; many experts prefer precursors like NMN or NR for oral use. Liposomal formulations may improve absorption. Start at 250mg to assess tolerance.
Morning, held under tongue for 2-3 minutes before swallowing
Sublingual delivery bypasses first-pass metabolism and may provide superior bioavailability compared to standard oral tablets. Dissolve completely under tongue for best absorption.
Morning or early afternoon; IV infusions typically administered over 1-4 hours
Cycle: Intensive: 10-day loading protocol, then weekly maintenance. General wellness: 1-2x per week ongoing.
IV infusions must be administered slowly to avoid flushing, nausea, and chest tightness. IM injection is an alternative but less common. Clinical supervision required for IV protocols. Infusion rates should not exceed 1mg/kg/hour initially.
Safety & Side Effects
NAD+ has a generally favorable safety profile at recommended oral and sublingual doses, with most adverse effects being mild, transient, and dose-dependent. IV infusions carry greater risk if administered too rapidly and should be performed under medical supervision; long-term effects of high-dose supplementation and theoretical concerns around NAD+ fueling cancer cell growth warrant cautious use in individuals with active malignancies.
Possible Side Effects
- !Nausea and gastrointestinal discomfort, particularly with rapid IV infusion or high oral doses
- !Flushing, warmth, and redness of the skin during IV administration
- !Headache, especially during initial use or higher doses
- !Fatigue or transient energy crash following infusion as cellular metabolism adjusts
- !Chest tightness or palpitations during rapid IV infusion (rate-dependent)
- !Insomnia or sleep disturbances if taken late in the day due to stimulatory effects on metabolism
- !Muscle cramping or discomfort at injection site with IM administration
- !Dizziness or lightheadedness during IV infusion
Interactions
- -May enhance the activity of PARP inhibitors (e.g., olaparib) used in oncology—concurrent use should be medically supervised
- -Alcohol and chronic alcohol use significantly depletes NAD+ and may alter the metabolic response to supplementation
- -May potentiate the effects of resveratrol and pterostilbene by increasing substrate availability for sirtuin activation—often intentionally stacked
- -Could theoretically interact with chemotherapy agents by supporting DNA repair pathways that may reduce drug efficacy—avoid in active cancer treatment without oncologist approval
- -Co-administration with tryptophan or niacin (B3) supplements may cause additive effects on NAD+ biosynthesis and increase risk of flushing or GI upset
Cost & Where to Buy
Oral and sublingual supplements range from $30-$80/month depending on dose and brand. IV infusion therapy ranges from $200-$800 per session at wellness clinics, making monthly IV protocols significantly more expensive. Liposomal oral formulations cost more than standard capsules but less than IV.
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