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Head-to-head evidence comparison — which supplement is right for you?
NMN vs Phenylpiracetam: NMN has the stronger overall evidence (5.5 vs 4/10); they're alternatives for boost daily energy — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
NMN wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
5 of 6 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
1 of 1 studies with measurable effects showed benefit.
Top outcomes
250-500mg
Morning, With or without food
NMN powder or capsules
100-200mg as needed
Morning (lasts 4-6 hours), Before demanding mental/physical tasks, On empty stomach for faster onset
Phenylpiracetam powder or capsules
2-4 weeks
2-4 weeks
Long-term
30-60 minutes
30-60 minutes
30-60 minutes
After 1-2 weeks daily use
Effect of 12-Week Intake of Nicotinamide Mononucleotide on Sleep Quality, Fatigue, and Physical Performance in Older Japanese Adults: A Randomized, Double-Blind Placebo-Controlled Study
Nutrients (2022) · Rct · n=108
Significant interactions were observed between 5-STS and drowsiness. 5-STS of all groups on post-intervention and drowsiness of the NMN_PM and Placebo_PM groups on mid- and post-intervention showed significant improvement compared with those in pre-intervention.
Anti-inflammatory effects of nicotinamide mononucleotide (NMN) in human skeletal muscle after BFR-exercise
Journal of the International Society of Sports Nutrition (2026) · Rct · n=11
BFR-exercise increased the mitochondrial content in exercised muscle by 171% after 24 h of recovery.
The differential impact of three different NAD(+) boosters on circulatory NAD and microbial metabolism in humans
Nature metabolism (2026) · Rct · n=65
Ultimately, we propose a gut-dependent model for the modes of action of the three NAD+ precursors with NR and NMN elevating circulatory NAD+ via the Preiss-Handler pathway, while rapidly absorbed Nam acutely affects NAD+ levels via the salvage pathway.
[Efficacy and safety of fonturacetam in asthenia: a systematic review and meta-analysis]
Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova (2025) · Meta analysis · n=549
The meta-analysis included 549 patients (mean age 45.9 years, 95% CI: 38.1-53.7).
[Pharmacological effects of fonturacetam (Actitropil) and prospects for its clinical use]
Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova (2024) · Systematic review
Phenylpiracetam (PP) is a nootropic drug with additional pharmacological effects, including anxiolytic, antiasthenic, antidepressant, anti-inflammatory and anticonvulsant effects.
[Asthenia, mental fatigue and cognitive dysfunction]
Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova (2023) · Observational
Fatigue can also be classified by neuromuscular and/or cognitive and mental fatigue.
Based on multiple RCTs showing dose-dependent increases in blood NAD+ levels. Effects vary significantly by formulation bioavailability. Most studies used 250-1000mg doses.
Based on meta-analysis (n=549) and systematic review (n=380) showing cognitive improvements in stroke/TBI patients and asthenia reduction. Effects include mental energy, focus, and psychostimulant properties. Rapid tolerance development limits daily use effectiveness.
AI-estimated from published studies. Interpret as directional guidance.
NMN has a higher evidence score (5.5/10 vs 4/10) and wins in 2 of 3 categories.
For boost daily energy, NMN has a higher relevance score (60 vs 45).
No known interactions between NMN and Phenylpiracetam have been documented in our database. However, always consult a healthcare provider before combining supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.