NMN
Nicotinamide Mononucleotide
Nicotinamide Mononucleotide (NMN) is a naturally occurring nucleotide and direct precursor to NAD+ (nicotinamide adenine dinucleotide), a coenzyme essential for cellular energy metabolism and DNA repair. It is primarily used as an anti-aging supplement to restore declining NAD+ levels associated with aging, with research suggesting potential benefits for metabolic health, mitochondrial function, and longevity pathways. Human clinical trials have demonstrated its ability to effectively raise blood NAD+ levels, though long-term efficacy data remains limited.
Mechanism of Action
NMN is converted intracellularly to NAD+ via the enzyme NMNAT (nicotinamide mononucleotide adenylyltransferase), bypassing rate-limiting steps in the NAD+ biosynthesis pathway. Elevated NAD+ activates sirtuins (SIRT1-7), a family of deacetylase enzymes that regulate gene expression, mitochondrial biogenesis, and stress resistance, as well as PARP enzymes involved in DNA damage repair. This restoration of NAD+ also supports the function of CD38 and other NAD+-consuming enzymes that decline with age-related NAD+ depletion.
Evidence by Health Goal(18 goals)
Dosing Protocols
Morning, with or without food
Most clinical trials have used 250-500mg/day. Some researchers use up to 1000mg/day but evidence for additional benefit above 500mg is limited. Taking in the morning aligns with circadian NAD+ biology and avoids potential sleep disruption.
Morning, hold under tongue for 60-90 seconds before swallowing
Sublingual powder or tablet formulations claim enhanced bioavailability by bypassing first-pass metabolism, though direct comparative bioavailability data in humans is limited. Lower doses may be sufficient compared to oral capsules.
Safety & Side Effects
NMN has a generally favorable short-term safety profile in human trials up to 12 months at doses of 250-1200mg/day, with no serious adverse events reported in published studies to date. However, long-term safety data beyond one year is lacking, and preclinical studies raise theoretical concerns about accelerating tumor growth in individuals with pre-existing cancer, warranting caution in oncology patients.
Possible Side Effects
- !Nausea and gastrointestinal discomfort at doses above 500mg
- !Mild flushing or facial warmth (less common than with niacin)
- !Headache, particularly during initial supplementation
- !Fatigue or lethargy reported by a subset of users
- !Insomnia or sleep disturbances if taken late in the day
- !Mild diarrhea at higher doses
- !Theoretical concern: NMN may stimulate cell proliferation pathways that could be problematic in individuals with existing cancers
Interactions
- -May enhance the efficacy of metformin by complementing AMPK activation and mitochondrial function - monitor for additive effects
- -Theoretically potentiates the activity of PARP inhibitors (e.g., olaparib) used in cancer therapy - avoid concurrent use without oncologist guidance
- -Combined use with resveratrol or pterostilbene may produce synergistic sirtuin activation - a common intentional stack but may amplify effects unpredictably
- -May modestly lower blood glucose - use caution and monitor levels if combined with insulin or oral hypoglycemic agents
- -Concurrent use with high-dose niacin (vitamin B3) may cause competitive pathway interference and is generally unnecessary
Cost & Where to Buy
Cost varies significantly by dose (250mg vs 500mg/day) and brand purity; third-party tested brands (e.g., Tru Niagen, Alive by Science) command premium pricing. Bulk powder is the most economical option. Prices have decreased substantially as the market has matured.
Search on Amazon