NMN + Fisetin is one of the most-asked NAD+ stack combinations. Fisetin is a senolytic — clears zombie cells that drive CD38 expression and NAD+ depletion. Pulse-dosed monthly. Synergistic with daily NMN.
This guide covers the science behind the combination, who it's most appropriate for, and the exact protocol — including dose, timing, and what to track.
NAD+ (nicotinamide adenine dinucleotide) is a redox coenzyme present in every cell. It powers mitochondrial ATP production via the electron-transport chain, fuels DNA-repair enzymes (PARPs), and is the obligatory substrate for sirtuins (SIRT1–SIRT7) — the enzyme family that controls gene expression, inflammation, and cellular survival.
NAD+ levels fall by 50% or more between ages 30 and 60. That decline is now considered a leading mechanistic explanation for age-related metabolic dysfunction, mitochondrial fatigue, accumulation of senescent cells, and the loss of muscle, skin, and cognitive resilience seen in aging.
NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) are the two NAD+ precursors with the strongest human data. Both raise NAD+ via the salvage pathway: NR is phosphorylated by NRK1/NRK2 to form NMN, then converted to NAD+; NMN is dephosphorylated to NR for cellular uptake or — per Imai's lab — taken up directly through the Slc12a8 transporter in mouse small intestine. NADH is the reduced electron-carrying form. Niacinamide (nicotinamide) and niacin (nicotinic acid) are cheaper but raise NAD+ less efficiently, and high-dose nicotinamide (>1 g/day) inhibits sirtuins.
CD38, an NAD+-degrading enzyme, rises with age. Inhibitors of CD38 — apigenin, quercetin, luteolin — preserve the NAD+ you make. Methylation cofactors (TMG, B12, folate) become depleted with high-dose precursor use because the body methylates excess nicotinamide for excretion.
Why this combination works. Fisetin is a senolytic — clears zombie cells that drive CD38 expression and NAD+ depletion. Pulse-dosed monthly. Synergistic with daily NMN.
Evidence base. Each ingredient (NMN and Fisetin) has independent human evidence. Combination evidence is mostly mechanistic, but the pathways are well-mapped. Stacking complementary mechanisms is a foundational longevity strategy.
Who benefits most. Users 40+ wanting senolytic + NAD+ benefit.
Exact protocol. Daily 500 mg NMN AM. Monthly pulse: 500 mg fisetin × 2 consecutive days. Daily option: 100 mg fisetin.
Fisetin dose. 500 mg × 2 days monthly (pulse) or 100 mg daily.
Tracking. Subjective: energy, sleep, recovery, cognitive performance at 4 and 8 weeks. Objective: condition-specific labs at 12 weeks (e.g., HbA1c, lipids, NAD+ blood test, body composition).
Cost. Adding Fisetin typically increases monthly supplement cost by $20–60. Prioritize NMN + TMG + apigenin as the core; add Fisetin based on your specific goals.
Can I take NMN and Fisetin together?
Yes — there are no documented interactions. Taking them together is convenient and supports adherence.
Is the order or timing important?
For most stacks, AM with breakfast is fine for both. Exceptions: apigenin (PM), magnesium (PM). Sublingual NMN can be taken separately if you prefer.
Will adding Fisetin let me reduce my NMN dose?
Not directly — they target different mechanisms. Maintain your effective NMN dose; Fisetin amplifies rather than substitutes.