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Evidence reviewed: 2026-10-02
Mixed human evidence for selected aerobic and anaerobic performance outcomes; possible benefits are small or context-dependent and do not support broad performance claims.
NIH ODS describes arginine performance findings as limited and conflicting. Newer meta-analyses report possible improvements in selected aerobic/anaerobic tests and VO2max, but effects vary by protocol and some pooled analyses show substantial heterogeneity. The evidence is not strong enough to treat arginine as a broadly reliable ergogenic aid.
Clinical studies have commonly used about 2–20 g/day, often far above the amount that can be inferred from a multi-ingredient product with no disclosed dose.
Short-term studies suggest up to about 9 g/day is generally tolerated, while higher doses more often cause gastrointestinal symptoms and can modestly lower blood pressure. Long-term high-dose safety is uncertain.
V-NITRO lists L-arginine but does not publish its amount. A nitric-oxide, pump, strength, or performance benefit cannot be inferred from ingredient presence alone.
Effects of Arginine Supplementation on Athletic Performance Based on Energy Metabolism: A Systematic Review and Meta-Analysis (Systematic review and meta-analysis; PMID 32370176)
Population/scope: 18 studies; 15 included in pooled performance analyses
Evidence scope: Aerobic and anaerobic exercise performance
Finding: Pooled analyses reported possible improvements in selected aerobic and anaerobic performance outcomes.
Limitations: Aerobic estimates showed substantial heterogeneity and protocols varied in dose, timing, training status, and outcome; results do not establish a broadly reliable ergogenic effect.
Directness: Relevant human evidence · verified 2026-10-02
The effect of L-arginine supplementation on maximal oxygen uptake: A systematic review and meta-analysis (Systematic review and meta-analysis of randomized clinical trials; PMID 33587327)
Population/scope: 11 randomized clinical trials in healthy people
Evidence scope: Maximal oxygen uptake (VO2max)
Finding: The pooled estimate favored a small increase in VO2max with L-arginine.
Limitations: VO2max is a surrogate performance measure and the evidence base was limited; findings do not establish strength, recovery, or finished-product efficacy.
Directness: Relevant human evidence · verified 2026-10-02
Important: Ingredient-level evidence is not proof that a finished product has the same effect. Dose, form, population, duration, and formulation must match.
For informational purposes only; not individualized medical advice.