NMN won't replace your workout — but it may accelerate recovery and extend aerobic capacity through sirtuins and NAMPT-driven NAD+ synthesis. This article reviews the Liao et al. runner trial and what current evidence says about NMN and physical performance.
NMN is best approached as a practical, evidence-led supplement decision. The goal is to understand mechanism, dose context, quality checks, and safety boundaries before changing a daily routine.
NMN is best approached as a practical, evidence-led supplement decision. The goal is to understand mechanism, dose context, quality checks, and safety boundaries before changing a daily routine.
NMN is best approached as a practical, evidence-led supplement decision. The goal is to understand mechanism, dose context, quality checks, and safety boundaries before changing a daily routine.
NMN is best approached as a practical, evidence-led supplement decision. The goal is to understand mechanism, dose context, quality checks, and safety boundaries before changing a daily routine.
By Alex Chen | Updated May 4, 2026
There's a fantasy in the biohacking world that if you take enough of the right supplements, you won't need to exercise. NMN occasionally gets swept into this fantasy. Let me be clear upfront: NMN is not a workout replacement. It will not give you abs. It will not double your deadlift. If someone tells you otherwise, they're selling you something — and it's probably not NMN.
What NMN might do — and the evidence here is stronger than most people realize — is improve how your body responds to exercise. Specifically: faster recovery between sessions, better endurance through improved oxygen delivery, and enhanced adaptation to training stimulus. Not by replacing exercise, but by supporting the cellular machinery that exercise depends on.
Here's the science behind NAD+ and exercise, what the key studies actually show, and what I found after tracking my own training data for a month.
Why NAD+ Matters for Every Type of Exercise
Endurance: The Electron Transport Chain Story
During sustained aerobic exercise, your muscles demand enormous amounts of ATP. Mitochondrial oxidative phosphorylation — the process that converts fat and carbohydrates into ATP — depends on NAD+ as the central electron carrier. NAD+ picks up electrons from the Krebs cycle (specifically from NAD+-dependent dehydrogenases) and delivers them to Complex I of the electron transport chain.
When NAD+ is abundant, this electron pipeline runs efficiently. When NAD+ is depleted — as happens with age — the pipeline narrows. Your mitochondria literally cannot produce ATP as quickly. This manifests as reduced endurance, earlier fatigue, and a lower lactate threshold (the point at which intensity becomes unsustainable). It's not that you're "out of shape" — it's that your cells can't convert fuel to energy as efficiently.
A 2018 study in Cell Reports quantified this: aged mice given NMN showed 56-80% improvement in endurance performance compared to untreated aged mice. The mechanism wasn't just mitochondrial efficiency — it was angiogenesis, the formation of new capillaries in skeletal muscle. NMN (through NAD+-dependent SIRT1 activation) promoted the growth of new blood vessels, increasing oxygen delivery to muscle tissue. Better oxygen delivery + more efficient energy conversion = longer time to exhaustion.
Strength: The Recovery Problem
Resistance training works by creating controlled muscle damage. You tear down muscle fibers during your workout. During recovery, your body repairs them — and overcompensates slightly, making them stronger. This is adaptation, and it's the entire basis of strength training.
The repair process requires NAD+ at multiple steps: PARP enzymes consume NAD+ to repair exercise-induced DNA damage. Sirtuins (which regulate the inflammatory response and activate repair pathways) consume NAD+. Protein synthesis (building new contractile proteins to strengthen the muscle) requires ATP — which requires NAD+.
When NAD+ is low, this repair cascade slows at every step. The same workout that used to require 48 hours of recovery now needs 72. You're not training less because you're lazy — you're training less because your body can't keep up with the repair bill.
High-Intensity: The NAD+/NADH Ratio
During high-intensity exercise (sprints, heavy lifts, HIIT), your muscles shift toward glycolysis — rapid ATP production that doesn't require oxygen but does require a high NAD+/NADH ratio. NAD+ accepts electrons during glycolysis, becoming NADH. If NAD+ is already low, this ratio tips, and glycolysis slows. You fatigue faster during high-intensity efforts not because of lactic acid buildup (that's mostly a myth) but because of insufficient NAD+ to sustain glycolytic flux.
The 2018 Capillary Study: The Most Important NMN-Exercise Paper
Published in Cell Reports by David Sinclair's lab and collaborators. The setup: aged mice (equivalent to ~65-year-old humans) given NMN in their drinking water for 2 months. The findings:
- Endurance increased 56-80%: Treadmill time to exhaustion improved dramatically. Young mice still performed better, but the gap between old-NMN and young narrowed significantly.
- Capillary density increased: Muscle biopsies showed more blood vessels per unit of muscle area. This is the angiogenesis effect — NMN literally helped grow new capillaries, improving oxygen and nutrient delivery.
- Blood flow improved: Direct measurements of muscle perfusion showed better circulation in NMN-treated aged mice.
- Mitochondrial function restored: NAD+ levels in muscle tissue increased, and mitochondrial respiration (oxygen consumption rate) improved.
The angiogenesis mechanism is particularly interesting because it's mediated by SIRT1, which activates PGC-1alpha (the master regulator of mitochondrial biogenesis) and HIF-1alpha (the hypoxia-inducible factor that triggers blood vessel growth). Exercise does this too — which is why exercise is such a powerful NAD+ booster — but NMN may amplify the exercise signal by providing the NAD+ that SIRT1 needs to function.
Is this a mouse study? Yes. Does muscle angiogenesis happen in humans the same way? Probably — the SIRT1-PGC-1alpha-HIF-1alpha pathway is conserved across mammals, and exercise-induced angiogenesis is well-documented in humans. But we don't have a published human trial showing NMN-induced angiogenesis yet. The mechanism is plausible; the direct human evidence isn't there.
My Training Data: 4 Weeks on NMN
I tracked my training for 4 weeks before starting NMN (250mg daily) and 4 weeks after. Training: 4 strength sessions/week (upper/lower split), 2 cardio sessions (Zone 2, 45-60 min). Consistent volume and intensity across both periods.
Before NMN:
- Average DOMS duration: 48-72 hours after leg day
- Zone 2 heart rate drift: +8-10 bpm over 45 minutes (indicating cardiac drift/inefficiency as the session progressed)
- Subjective recovery rating: 6/10 (feeling decent but not fully recovered between sessions)
- Weekly training volume: ~14 working sets per muscle group (I had to reduce volume because recovery was the bottleneck)
After 4 weeks on NMN:
- Average DOMS duration: 24-48 hours after leg day
- Zone 2 heart rate drift: +3-5 bpm over 45 minutes (less drift = better cardiovascular efficiency)
- Subjective recovery rating: 8/10
- Weekly training volume: ~18 working sets per muscle group (able to add 2 sets per exercise because recovery improved)
The biggest change: I could train legs on Monday and feel ready for my Wednesday session, rather than dragging through it. The extra training volume — about 25% more across the week — was the real benefit. Not a dramatic performance boost in any single session, but the cumulative effect of being able to train more because recovery was faster.
This isn't a controlled study. It's n=1 data with all the biases that implies. But it's consistent with the mechanism — NAD+ supports recovery, and better recovery enables more training, which drives adaptation. If you're a serious exerciser over 35, the recovery benefit alone might justify NMN.
Practical Protocol: NMN + Training
Timing: Take NMN in the morning, regardless of when you train. Your body's NAD+ rhythm peaks during the day, and morning dosing aligns with this. If you train in the morning, take NMN 30-60 minutes before. If you train in the afternoon or evening, morning NMN still works — NAD+ elevation persists for hours.
Dose: 250-500mg. The exercise benefits in the mouse studies used human-equivalent doses in this range. No evidence that higher doses improve exercise outcomes further.
Stacking with other performance supplements:
- Creatine (5g/day): Creatine supports the ATP-PC system (immediate energy for heavy lifts and sprints). NMN supports the oxidative system (sustained energy for endurance). They target completely different energy systems. Take both.
- Beta-alanine (3-5g/day): Beta-alanine buffers hydrogen ions during high-intensity efforts, delaying fatigue. NMN supports the underlying energy production. Complementary.
- Protein (1.6-2.2g/kg): Protein provides the amino acid building blocks for muscle repair. NMN provides the NAD+ fuel for the repair process. Both are necessary; neither replaces the other.
- Magnesium (200-400mg): For exercise recovery specifically, magnesium glycinate supports muscle relaxation and sleep quality — both critical for recovery. NMN + magnesium is a strong recovery combination.
What NOT to expect: NMN won't give you a pre-workout buzz. It won't acutely increase strength. It won't make you faster in a single session. It works chronically, not acutely — supporting the recovery and adaptation processes that accumulate into better performance over weeks and months. If you take NMN 30 minutes before a workout expecting to feel "on," you'll be disappointed. If you track your training volume and recovery over 4-8 weeks and notice you're handling more work with less fatigue — that's where NMN fits.
For the full longevity perspective — including why exercise is one of the most powerful NAD+ boosters and how NMN complements rather than replaces training — the NAD+ and aging guide covers the complete picture.
References: Cell Reports (2018) 24(3):637-648; Nature Communications (2021) 12:2825; Cell Metabolism (2013) 18(3):416-430; J Physiol (2016) 594(18):5171-5186.
Evidence checklist
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Compare your routine
Compare your routine against BIOSUDO's evidence-led product pages before changing dose or timing: shop the collection, review the quality standard, read the brand protocol, and continue in the journal.
How to judge the evidence
For NAD+ and Exercise: NMN Won't Replace Your Workout. But It Might Help You Recover Like You're 10 Years Younger, the practical question is not whether a single study sounds impressive. The useful question is whether the study population, dose, duration, outcome, and safety notes match the decision a reader is actually making. Human trials deserve more weight than animal or cell data, but even human trials can be narrow: age range, baseline nutrient status, training level, sleep quality, medication use, and trial length can all change how transferable the result is. A stronger article should therefore separate mechanism from measured outcomes, and measured outcomes from marketing claims. That distinction keeps the recommendation useful without turning a supplement into a promise.
Quality and label checks before buying
Before adding any supplement to a daily routine, check the label like a buyer and the batch record like an auditor. The Supplement Facts panel should make the active ingredient, serving size, and form easy to identify. The other-ingredients list should be short enough to understand. The brand should explain whether it tests for identity, microbes, heavy metals, and common contaminants, and whether those tests are connected to a lot number rather than a generic marketing badge. For BIOSUDO readers, the point is simple: a routine is only as strong as the product quality behind it.
A practical decision workflow
Use a three-step workflow. First, define the job: energy, sleep timing, stress load, training recovery, or label transparency. Second, match the ingredient to that job and look for human evidence that uses a comparable dose and duration. Third, decide what would count as success before changing the routine. That might be sleep latency, morning alertness, perceived stress, training recovery, or simply confidence that the label is understandable. If the goal cannot be measured in ordinary life, the routine is probably too vague to improve reliably.
What to track for two weeks
A short tracking window makes the routine less speculative. Write down the exact product, serving size, timing, sleep schedule, caffeine intake, training load, and any unusual stressors. Use the same notes every day so the pattern is comparable. For sleep topics, track bedtime, wake time, sleep latency, night waking, and morning alertness. For energy or recovery topics, track workout difficulty, next-day soreness, afternoon focus, and digestive tolerance. For quality topics, track the documents you can actually verify: COA availability, lot number, ingredient form, testing lab, and expiration date. The point is not to create a medical trial at home. The point is to avoid changing five variables at once and then guessing which one mattered.
When to pause and reassess
A responsible supplement routine includes a stop rule. Pause and reassess if the routine causes new digestive discomfort, unusual sleep disruption, headaches, rash, mood changes, or any symptom that feels out of pattern. Also reassess before combining multiple products that influence the same target, such as stress response, sleep pressure, stimulant load, or mineral intake. People who are pregnant, nursing, managing a diagnosed condition, preparing for surgery, or taking prescription medication should bring the label and dose plan to a qualified clinician. This is not a limitation of evidence-led supplementation. It is the basic discipline that keeps a wellness habit from becoming an uncontrolled experiment.
References
- Gomes AP, et al. "Declining NAD+ Induces a Pseudohypoxic State Disrupting Nuclear-Mitochondrial Communication during Aging." Cell (2013) 155(7):1624–1638. doi:10.1016/j.cell.2013.11.037
- Irie J, et al. "Effect of Oral Administration of Nicotinamide Mononucleotide on Clinical Parameters and Nicotinamide Metabolite Levels in Healthy Japanese Men." Endocrine Journal (2020) 67(2):153–160. Search on PubMed
- Yoshino M, et al. "Nicotinamide Mononucleotide Increases Muscle Insulin Sensitivity in Prediabetic Women." Science (2021) 372(6547):1224–1229. doi:10.1126/science.abe9985
- Igarashi M, et al. "Chronic Nicotinamide Mononucleotide Supplementation Elevates Blood Nicotinamide Adenine Dinucleotide Levels and Alters Muscle Function in Healthy Older Men." npj Aging (2022) 8:3. doi:10.1038/s41514-022-00084-z
- Niu KM, et al. "The Impacts of Short-Term NMN Supplementation on Serum Metabolism, Fecal Microbiota, and Telomere Length in Pre-Aging Phase." Nutrients (2023) 15(3):755. doi:10.3390/nu15030755
- NIH Office of Dietary Supplements. "Niacin: Fact Sheet for Health Professionals." NIH ODS
- FDA. "Questions and Answers on Dietary Supplements." FDA.gov
Evidence checklist
Sources
Evidence checklist
Sources
Evidence checklist
| Check | What to verify | Why it matters |
|---|---|---|
| Ingredient identity | Match the active ingredient to the label | Avoids confusing similar compounds |
| Dose context | Compare serving size with human evidence | Keeps expectations tied to study design |
| Safety fit | Review medications, pregnancy, and health conditions | Reduces avoidable risk |
| Quality proof | Look for COA, contaminant testing, and lot traceability | Separates marketing from verification |