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Metabolic Modulators

NMN

NAD+ precursor that reliably raises NAD+ levels in humans; clinical benefits so far are modest and inconsistent.

SupplementEvidence level 3 of 5: Limited human dataAlso: Nicotinamide mononucleotide, β-NMN, Beta-nicotinamide mononucleotide

Overview

NMN (nicotinamide mononucleotide) is a direct precursor of NAD+, a coenzyme essential for energy production, DNA repair and the activity of sirtuin enzymes. NAD+ levels fall with age, and restoring them extends healthspan in animal studies. In people, oral NMN reliably raises blood NAD+ and has been well tolerated across the doses studied in trials. Clinical benefits are less certain: one trial found improved muscle insulin sensitivity in prediabetic women, and others report small gains in walking speed or endurance, while several show no meaningful change. NMN is a reasonable adjunct to exercise, sleep and nutrition, not a substitute for them.

Classification
Nucleotide NAD+ precursor (small molecule); not a peptide
Route
Oral (capsule, powder or sublingual)
Half-life
Minutes in plasma; rapidly converted to NAD+

Mechanism of action

Primary targetNAD+ salvage pathway
  1. Absorbed and transportedTaken up in the gut, possibly via the Slc12a8 transporter or after conversion.
  2. Converted to NAD+NMNAT enzymes convert NMN directly into NAD+ inside cells.
  3. Sirtuins activatedHigher NAD+ supports SIRT1 and SIRT3 deacetylase activity.
  4. Mitochondrial functionImproved oxidative metabolism and mitochondrial quality control.
  5. DNA repair supportNAD+ is the substrate for PARP-mediated DNA repair.
Downstream effects
  • Higher blood NAD+
  • Insulin sensitivity (mixed)
  • Modest physical function gains

Researched for

  • Age-related NAD+ decline
  • Insulin resistance and prediabetes
  • Physical performance in older adults
  • Vascular aging
  • Longevity

Research notes

  • Yoshino 2021 (Science): 10 weeks of NMN improved muscle insulin sensitivity in prediabetic postmenopausal women (n=25).
  • Multiple 8–12-week RCTs confirm dose-dependent NAD+ increases with a good short-term safety profile.
  • Effects on walking speed, grip strength and endurance are small and inconsistent across trials.
  • No long-term outcome data on disease or lifespan in humans.

Reported side effects

  • Mild nausea or GI upset
  • Flushing (uncommon)
  • Headache
  • Possible homocysteine rise with high doses

Contraindications & cautions

  • Active malignancy (theoretical concern)
  • Pregnancy or breastfeeding (no data)
  • Hyperhomocysteinemia (monitor)

Lab monitoring

  • Homocysteine
  • Vitamin B12 and folate
  • Fasting glucose, HbA1c, fasting insulin
  • Lipid panel
  • CMP

Dosing and pricing for NMN

Dosing references and compound pricing are available to established patients in the secure portal after a medical evaluation.

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