NMN and exercise have been tested together in only a handful of human trials, and none of them compared taking NMN before a workout with taking it after. For adults in the US, the practical answer is simple: take NMN at the same time every day, as the label directs, and train on your normal plan. Timing around the session has no human evidence behind it.
What the trials do show is narrower and more interesting. In one 6-week study of recreational runners, NMN plus regular training improved some aerobic measures more than training alone. In older adults, NMN raised blood NAD+ and nudged walking and grip tests. None of this makes NMN a pre-workout, and none of it replaces the training itself.
This page covers only the exercise question. For morning-versus-night timing, read when to take NMN: morning or night. For dose ranges across trials, read how much NMN per day.
What the 2021 Runner Trial Found
The best-known NMN exercise study is a 2021 randomized, double-blind trial in the Journal of the International Society of Sports Nutrition. It enrolled 48 recreationally trained runners, 40 men and 8 women aged 27 to 50. Each group took 300, 600 or 1,200 mg of NMN a day, or a placebo, for 6 weeks.
Everyone kept training. Sessions lasted 40 to 60 minutes, 5 to 6 times a week. After 6 weeks, the 600 mg and 1,200 mg groups showed bigger gains than placebo in oxygen uptake and in power at the first and second ventilatory thresholds. Those thresholds roughly mark the pace where breathing gets harder.
The same paper also reports what did not move. VO2max, O2-pulse and peak power did not change from baseline in any group. So the result is a better use of oxygen at sub-maximal effort, not a higher ceiling.
Two limits matter. The trial was small and ran for only 6 weeks. And every participant was already training hard, so it says nothing about NMN without exercise.
What Trials in Older Adults Show
Two other trials looked at physical function rather than athletic performance.
A 2022 trial in npj Aging gave healthy men aged 65 and older 250 mg of NMN a day, or placebo, for 12 weeks. NMN was well tolerated and raised NAD+ in whole blood. The researchers saw nominal improvements in gait speed and left-hand grip strength. Nominal means the signal was small and needs larger studies. NMN did not change muscle mass or body composition.
A 2023 trial in GeroScience gave 80 healthy middle-aged adults placebo or 300, 600 or 900 mg of NMN once a day for 60 days. Blood NAD rose in every NMN group. Six-minute walking distance increased more than placebo in all three NMN groups, with no safety issues found. This was not an exercise-training study, so it cannot say how NMN and a workout plan interact.
NMN and Exercise Evidence at a Glance
| Question | What the evidence says | Source |
|---|---|---|
| Does NMN help endurance during training? | Some aerobic measures improved more than placebo at 600–1,200 mg in trained runners over 6 weeks | Liao 2021, JISSN |
| Does it raise VO2max or peak power? | No change from baseline in any group | Liao 2021, JISSN |
| Does it build muscle? | No effect on muscle mass in men 65+; strength unchanged in a 2026 pooled analysis | npj Aging 2022, Front Nutr 2026 |
| Does it ease how tired you feel? | No NAD+ precursor improved perceived fatigue in a 27-study analysis | Front Nutr 2026 |
| Before or after a workout? | No human trial compares the two | Europe PMC search |
| Is it safe short term? | No increase in adverse events across 15 trials, 14 days to 24 weeks | Nutrients 2026 |
A 2026 network meta-analysis of 27 studies and 1,599 people sums up the pattern. NMN showed a dose-dependent improvement in endurance, while neuromuscular strength stayed the same. No NAD+ precursor improved perceived fatigue.
Before or After a Workout? The Timing Gap in the US Evidence
No published human trial has tested NMN before a workout against NMN after a workout. Any article that tells you one window is better is guessing.
The runner trial did not test timing either. Its participants took one dose at breakfast and one at lunch or in the afternoon, before their training. That was a schedule, not a comparison.
So pick a time you can repeat every day. The AgeAura label says 2 capsules daily at the same time each morning, and many people take it with their first meal or black coffee. If you train in the morning, take it with breakfast before or after the session, whichever fits. If you train in the evening, the morning dose still stands.
A Simple Routine for Training Days and Rest Days
Consistency matters more than the clock. Here is a routine that matches the label and the evidence:
✅ Take 2 capsules at the same time each morning, training day or not.
✅ Keep your usual pre-workout meal, water and caffeine habits.
✅ Follow your training plan: the runner gains came with 5–6 sessions a week.
✅ Ask a clinician first if you take medication or manage a health condition.
The training plan is the part with the strongest evidence. The CDC recommends that adults get 150 minutes of moderate aerobic activity a week, or 75 minutes of vigorous activity, plus at least 2 days of muscle-strengthening work. A supplement sits on top of that, not in place of it.
If you also take creatine, our NMN and creatine stack guide covers that pairing. Before you start, read NMN side effects: 6 checks before you start.
Where to Buy AgeAura NMN + TMG in the US
Wellness Nest (wellnessnest.co) is the official US source for AgeAura Pure NMN + TMG NAD+ Complex. It costs $69.95 for a 60-capsule bottle, which is 30 servings at 2 capsules a day. Each serving lists 500 mg NMN and 250 mg TMG. Orders over $70 ship free in the US, and the store lists a 90-day refund policy (eligibility applies). You can also find it among the store's best sellers.
Frequently Asked Questions
Should I take NMN before or after a workout?
Either is fine, because no human trial has compared the two. In the 2021 runner study, people took one dose at breakfast and one at lunch or in the afternoon, before training, but that schedule was never tested against another. Take NMN at the same time every day, as your label directs. The AgeAura label says 2 capsules each morning, often with the first meal.
Should I take NMN on rest days?
Yes, if you take it daily. The trials gave NMN every day for 6 to 12 weeks, not only on training days, and blood NAD+ rose with steady daily use. Skipping rest days breaks the routine that the studies actually tested. Keep the same morning time on rest days, and keep your rest days, because recovery is part of any training plan.
Does NMN replace a pre-workout supplement?
No. NMN is not a stimulant and gives no immediate energy boost before a session. The AgeAura label notes it is not a stimulant stack. In the runner trial, gains in aerobic measures appeared after 6 weeks of daily use plus 5 to 6 training sessions a week. If you want a pre-session effect, NMN is the wrong tool; treat it as a daily habit instead.
Can older adults who exercise take NMN?
Trials in older adults found NMN well tolerated. One gave men aged 65 and older 250 mg a day for 12 weeks; it was well tolerated, with a small, unconfirmed improvement in gait speed and grip. Older adults often take medication or manage health conditions, so ask a clinician before starting. The AgeAura label gives the same advice for anyone in that situation.
Where can I buy NMN + TMG in the US?
Wellness Nest sells AgeAura Pure NMN + TMG NAD+ Complex at wellnessnest.co for $69.95 for 60 capsules (30 servings). Orders over $70 ship free in the US, and the store lists a 90-day refund policy with eligibility rules. The product also appears in the best sellers collection.
About the Author
Dr. Marcus Hale — Dr. Marcus Hale is the resident health researcher behind Wellness Nest's editorial team, translating peer-reviewed sports-nutrition and longevity research into practical daily guidance for US readers.
