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.