Quercetin for Exercise Performance

Research suggests that quercetin supplementation may offer modest benefits for exercise performance and recovery, though the overall evidence is mixed and effect sizes are generally small. A 2011 meta-analysis pooling data from 11 studies found a statistically significant but practically small improvement of roughly 2% in VO2max and endurance capacity, and a 2023 systematic review of 34 studies reported associations with reduced markers of muscle damage and inflammation, while acknowledging that findings varied considerably depending on participant training status, quercetin source, and exercise protocol. Studies indicate that trained athletes may be less likely to benefit than untrained individuals, and several controlled trials in swimmers, cyclists, and athletes found no significant improvements in performance outcomes compared to placebo, with one 2025 trial in trained cyclists suggesting that existing training adaptations may limit quercetin's usefulness in well-conditioned populations. The body of evidence spans randomized controlled trials, meta-analyses, systematic reviews, and animal studies, but collectively points to the conclusion that while quercetin shows theoretical promise through mechanisms such as antioxidant activity, anti-inflammatory effects, and potential influence on mitochondrial function, its practical impact on human exercise performance remains uncertain and likely modest at best.