Written by the Nuvirox Research Team
KEY POINTS
- An acute NR trial improved muscle strength and fatigue resistance — but only in older adults, with no effect in the young.
- Combining NAD+ precursors with exercise training has produced conflicting results across studies.
- If you're young and already training, the evidence for a performance edge is weak.
Short answer: maybe, if you're older — probably not, if you're young. The cleanest human trial on NAD+ and exercise found that nicotinamide riboside improved a measure of muscle fatigue and strength, but the benefit appeared only in older participants and was completely absent in younger ones. That age-dependent pattern is the honest headline, and it cuts against the idea of NAD+ as a general pre-workout.
Why would NAD+ matter for exercise at all?
NAD+ sits at the centre of how muscle cells turn fuel into ATP, the energy currency of contraction. It also shuttles between its forms (NAD+ and NADH) during energy metabolism and supports redox balance — the handling of oxidative stress that rises during exertion. The theory is that topping up NAD+ could support energy output and recovery. Theory, though, is where this often stays.
What did the standout trial find?
In a double-blind crossover study, twelve young and twelve older men received NR or placebo. Two hours after dosing, the researchers measured redox markers and physical performance — VO2max, strength, and a fatigue index.
STUDY SNAPSHOT
| Design | Double-blind, placebo-controlled crossover (acute) |
| Participants | 12 young + 12 older men |
| Dose | 2 × 250 mg NR vs placebo |
| Result (older) | Isometric peak torque +8%, fatigue index +15%, oxidative stress −18% |
| Result (young) | No redox or performance effect |
In the older group, NR raised NAD(P)H, lowered a marker of oxidative stress by about 18%, improved isometric peak torque by 8%, and improved the fatigue index by 15%. In the young group, it did none of that. The authors' interpretation: redox supplementation helps mainly when there's an underlying deficiency to correct. Older muscle starts lower; younger muscle doesn't have the same headroom.
Does pairing NAD+ with training help?
Here the evidence gets messier and more honest. Reviews of NR and exercise note that combining NAD+ precursors with training has produced conflicting results, with some animal work even suggesting NR could blunt certain exercise adaptations by interfering with redox signalling that exercise normally uses as a positive stress. That's a genuine note of caution, not a selling point: more NAD+ is not automatically better for a body that's adapting to training.
Other human work supports NAD+'s role in muscle more broadly — NR augmented the NAD+ metabolome in aged skeletal muscle and shifted anti-inflammatory signatures — but "changes muscle biochemistry" is several steps short of "makes you fitter or faster."
What NAD+ won't do for your training
It won't function as a stimulant pre-workout, won't reliably boost performance in healthy young athletes, and won't replace the fundamentals — progressive training, protein, and sleep — that actually drive adaptation. If your training fatigue is tied to under-recovery or a specific energy crash, our piece on the afternoon crash and training is more relevant than an NAD+ bottle.
Who might reasonably try it?
On the evidence, the most plausible candidate is an older adult dealing with age-related decline in muscle function, where baseline NAD+ is lower and the one clean trial showed an effect. Even then, the effect was modest and acute. A younger, well-trained person hoping for a performance edge is extrapolating well beyond what the data support.
Why age seems to matter so much here
The single most striking feature of the exercise-and-NAD+ literature is how often the effect shows up in older participants and disappears in younger ones. In Dolopikou's acute trial, the improvements in isometric torque and fatigue resistance, and the drop in oxidative stress, were seen in the older group — not in the young adults given the same protocol. The most plausible reading is that younger people generally aren't NAD+-limited for exercise, so topping up a system that isn't short doesn't add much. This is a useful filter for your own expectations: a fit 25-year-old and a 65-year-old are not the same candidate for any performance effect.
What this does and doesn't justify
None of this supports the idea that an NAD+ precursor is an ergogenic aid in the way creatine or caffeine have earned that label through repeated trials. The exercise signals are small, somewhat age-dependent, and not consistently replicated across endpoints. If you train and also take NAD+ for broader cellular reasons, any workout benefit is a speculative bonus rather than a reason to buy. And the foundations — progressive training, protein intake, sleep — will out-predict any supplement here by a wide margin.
If you do want to test it on yourself, pick one objective marker — a repeatable lift, a timed effort, a fixed route — and track it over several weeks rather than trusting day-to-day feel, which is heavily swayed by sleep and motivation. That kind of simple personal measurement will tell you more than any marketing claim about whether the supplement is doing anything for your training specifically.
Frequently asked questions
Does NAD+ improve athletic performance?
Only weakly, and mainly in older adults. The standout trial improved strength and fatigue resistance in older men but showed no effect at all in younger men.
Should I take NAD+ before a workout?
There's no good evidence it works as a pre-workout. The one acute trial dosed two hours before testing and only helped older participants.
Could NAD+ interfere with training adaptations?
Possibly. Some animal work suggests high antioxidant or redox supplementation can blunt the beneficial stress signals exercise relies on. The human picture is unsettled.
Is NAD+ useful for older adults who exercise?
It's the most defensible use case, given the trial showing benefit in older muscle — but the effect was modest, and training, protein, and sleep matter far more.
From Nuvirox
Why we formulated NAD+ Restore
NAD+ Restore is built around 500 mg of Nicotinamide Riboside Chloride (NR) per two-capsule serving — one of the two most-researched NAD+ precursors, within the dose range used in published human trials. We pair it with 150 mg trans-resveratrol (from Japanese Knotweed) and 50 mg quercetin (from Sophora japonica), polyphenols studied alongside NAD+ pathways for cellular health support, plus 10 mg galactomannans from fenugreek to support absorption.
It ships with a 60-day money-back guarantee — long enough to actually evaluate it the way the research says you should.
Learn more about NAD+ Restore →The bottom line
NAD+ and exercise is a story about deficiency, not enhancement. The one clean human trial helped older muscle and did nothing for the young, and combining precursors with training has produced mixed and occasionally cautionary results. If you're older and dealing with age-related decline, it's a reasonable experiment; if you're young and chasing a performance edge, the evidence isn't there.
References
- Dolopikou CF, et al. Acute nicotinamide riboside supplementation improves redox homeostasis and exercise performance in old individuals: a double-blind cross-over study. Eur J Nutr. 2020;59(2):505–515. PMID: 30725213. DOI: 10.1007/s00394-019-01919-4.
- Elhassan YS, et al. Nicotinamide riboside augments the aged human skeletal muscle NAD+ metabolome and induces transcriptomic and anti-inflammatory signatures. Cell Rep. 2019;28(7):1717–1728.e6. DOI: 10.1016/j.celrep.2019.07.043.
- Martens CR, et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults. Nat Commun. 2018;9:1286. PMID: 29599478. DOI: 10.1038/s41467-018-03421-7.
- Sharma A, et al. What is really known about the effects of nicotinamide riboside supplementation in humans. Sci Adv. (review of 25 human NR trials). DOI: 10.1126/sciadv.adi4862.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.