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Head-to-head evidence comparison — which supplement is right for you?
Urolithin A wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
2 of 2 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
7 of 7 studies with measurable effects showed benefit.
Top outcomes
300–500 mg daily
Morning with breakfast, Split dosing (morning and midday) for doses above 500 mg
Nicotinamide Riboside Chloride capsules or powder
500-1000mg
Morning with food
Mitopure (highly pure, bioavailable form)
1–2 weeks
4–8 weeks
8–16 weeks
4–8 weeks
4-8 weeks
8-16 weeks
8-16 weeks
The Effect of Nicotinamide Mononucleotide and Riboside on Skeletal Muscle Mass and Function: A Systematic Review and Meta-Analysis.
Journal of cachexia, sarcopenia and muscle (2025) · Meta analysis
Systematic review and meta-analysis evaluating NMN and NR effects on skeletal muscle mass and function
NAD+ supplementation for anti-aging and wellness: A PRISMA-guided systematic review of preclinical and clinical evidence.
Ageing research reviews (2026) · Systematic review
PRISMA-guided systematic review of both preclinical and clinical NAD+ supplementation literature
NAD+ therapy in age-related degenerative disorders: A benefit/risk analysis.
Experimental gerontology (2020) · Systematic review
Systematic review of 147 articles (113 preclinical, 34 clinical) on NAD+ precursor therapy
The effect of a high-polyphenol Mediterranean diet (Green-MED) combined with physical activity on age-related brain atrophy: the Dietary Intervention Randomized Controlled Trial Polyphenols Unprocessed Study (DIRECT PLUS)
The American journal of clinical nutrition (2022) · Rct · n=284
Among 284 participants (88% men; mean age: 51 y; BMI: 31.2 kg/m2; APOE-ε4 genotype = 15.7%), 224 (79%) completed the trial with eligible whole-brain MRIs.
Urolithin A induces mitophagy and prolongs lifespan
Nature Medicine (2016) · Preclinical
Extended lifespan in animal models
Effect of the mitophagy inducer urolithin A on age-related immune decline: a randomized, placebo-controlled trial
Nature aging (2025) · Rct · n=50
Exploratory single-cell RNA sequencing demonstrated UA-driven transcriptional shifts across immune populations, modulating pathways linked to inflammation and metabolism.
Based on 8-week RCT showing dose-dependent increases of 22%, 51%, and 142% at 100, 300, and 1000mg respectively. Individual response varies significantly (30% show variable response). NR-SAFE trial confirmed safety up to 2000mg.
Based on 3 RCTs (n=88, n=66, n=20) showing improvements in muscle endurance and strength. Effects observed primarily in middle-aged and older adults over 8-16 weeks. Studies used synthetic urolithin A forms with high bioavailability.
AI-estimated from published studies. Interpret as directional guidance.
Urolithin A has a higher evidence score (8.5/10 vs 7.2/10) and wins in 2 of 3 categories.
For healthy aging, Nicotinamide Riboside has a higher relevance score (90 vs 85).
No known interactions between Nicotinamide Riboside and Urolithin A have been documented in our database. However, always consult a healthcare provider before combining supplements.