NMN Dosage Calculator

What is NMN?

Nicotinamide mononucleotide (NMN) is a nucleotide derived from ribose and nicotinamide that serves as the most direct dietary precursor to NAD⁺ (nicotinamide adenine dinucleotide) — a coenzyme essential for mitochondrial energy metabolism, DNA repair, and the activity of longevity-associated sirtuins (SIRT1–7). NAD⁺ levels decline by approximately 50% between ages 20 and 60, and this decline is causally implicated in the mitochondrial dysfunction, genomic instability, and epigenetic dysregulation that characterise biological ageing. The landmark 2016 study by Mills et al. (Cell Metabolism, PMID 27986707) demonstrated that 12 months of NMN supplementation in aged mice (22 months) restored NAD⁺ levels to those of young mice, reversed age-associated physiological decline including muscle strength, energy metabolism, insulin sensitivity, eye function, and bone density, and extended healthspan without detectable toxicity. This was the first comprehensive demonstration that a dietary supplement could reverse multiple hallmarks of ageing simultaneously in mammals. In humans, the first placebo-controlled RCT (Yoshino et al., Science, 2021, PMID 34936788) enrolled 25 postmenopausal women with prediabetes and found that 250 mg/day NMN for 10 weeks significantly increased skeletal muscle NAD⁺ biosynthesis, improved insulin signalling (muscle insulin sensitivity by 25%), and activated SIRT1 and SIRT3 pathways in muscle tissue. A 2022 RCT in healthy older adults (60–80 years) found 250 mg/day NMN improved muscle strength and walking speed versus placebo over 12 weeks. Mechanistically, NMN is absorbed intact through the small intestinal NMN transporter (Slc12a8) and converted intracellularly to NAD⁺ via NMNAT enzymes, bypassing the rate-limiting NAMPT step in the salvage pathway. This directness of conversion distinguishes NMN from NR (nicotinamide riboside), though head-to-head human comparisons remain limited.

How to Take NMN

**General longevity supplementation:** 250–500 mg/day. This range matches the doses used in published human RCTs and achieves measurable NAD⁺ elevation in blood. Most users begin at 250 mg and assess tolerability over 2–4 weeks before increasing. **Anti-aging / research protocol (Sinclair et al.):** 500–1,000 mg/day, taken in the morning with a small amount of fat (NMN is more stable when not exposed to stomach acid; some researchers use enteric-coated formulations). David Sinclair (Harvard, co-author of the 2013 Cell NMN paper) has publicly stated he takes 1 g/day; this is consistent with the mouse-to-human dose scaling from the Mills 2016 study. **Sublingual NMN** bypasses first-pass intestinal metabolism and achieves higher plasma NMN concentrations than oral capsules at equivalent doses — a relevant consideration for individuals targeting maximum NAD⁺ elevation. Take in the morning: NAD⁺ is a key circadian clock regulator and morning supplementation aligns with natural NAD⁺ biosynthesis rhythms. Avoid evening dosing as it may interfere with sleep in some users.

Timing Recommendations

Morning dosing on an empty stomach or with a light fat-containing meal. NAD⁺ metabolism follows circadian rhythms driven by CLOCK/BMAL1 — morning NMN supplementation augments the natural daytime peak. Combining with resveratrol or pterostilbene (SIRT1 activators) may synergistically enhance the downstream effects of elevated NAD⁺.

Potential Side Effects & Safety

NMN is well tolerated in all completed human trials with no serious adverse events reported at doses up to 1,200 mg/day. Mild, transient GI effects (nausea, loose stools) occur at higher doses in a minority of users and resolve with food co-administration. One theoretical concern: NAD⁺ is consumed by CD38 (an ectoenzyme that degrades NAD⁺, upregulated in ageing and inflammation) — co-supplementing with CD38 inhibitors (apigenin, quercetin) may enhance NMN efficacy by reducing NAD⁺ degradation. No human toxicity data exists for doses above 1,200 mg/day.

Best Stacks with NMN

The canonical longevity stack: NMN (500 mg) + resveratrol (500 mg) + quercetin (500 mg, as CD38 inhibitor to prevent NAD⁺ degradation) + apigenin (50 mg). Take together with a fat-containing meal (resveratrol and quercetin are fat-soluble). Adding TMG (trimethylglycine, 500 mg) counteracts potential methyl group depletion from elevated NAD⁺ metabolism.

Scientific References

All dosage recommendations are grounded in peer-reviewed research.

1. 1
   Long-Term Administration of Nicotinamide Mononucleotide Mitigates Age-Associated Physiological Decline in Mice

   Cell Metabolism · 2016

2. 2
   Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women

   Science · 2021

3. 3
   NAD⁺ metabolism and its roles in cellular processes during ageing

   Nature Reviews Molecular Cell Biology · 2021