L-Arginine boosts athletic performance
evidence
The Claim
It is commonly believed that L-Arginine can enhance athletic performance by improving blood flow and increasing muscle mass. Athletes often use it to gain a competitive edge, thinking it will significantly improve endurance and strength.
Origin
This myth likely stems from L-Arginine's role in nitric oxide production, which is known to dilate blood vessels. Early studies and marketing claims have capitalized on this potential benefit.
What Science Says
While some studies suggest L-Arginine can modestly improve blood flow, a meta-analysis of randomized controlled trials (RCTs) indicates that its effects on athletic performance are inconsistent and minimal. Findings show no significant enhancement in strength or endurance for most individuals. The variability of results suggests individual response may vary.
Verdict
Misleading
Sources
- PMID:32370176 Effects of Arginine Supplementation on Athletic Performance Based on Energy Metabolism: A Systematic Review and Meta-Analysis.
- PMID:34965876 Effect of food sources of nitrate, polyphenols, L-arginine and L-citrulline on endurance exercise performance: a systematic review and meta-analysis of randomised controlled trials.
- PMID:39972597 Effects of different dietary supplements on athletic performance in soccer players: a systematic review and network meta-analysis.