A meta-analysis of 11 quercetin exercise RCTs found quercetin supplementation (500–1,000 mg/day) reduced markers of exercise-induced muscle damage (CK, myoglobin), decreased perceived exertion, and showed trends toward improved VO2 max. The senolytic mechanism on muscle satellite cells is an emerging area distinct from the acute anti-inflammatory effects.

Should athletes take quercetin before or after exercise?

Pre-exercise quercetin (2–3 hours before) allows plasma levels to peak during exercise, providing antioxidant protection during the training session. Post-exercise quercetin (24+ hours after) avoids potentially blunting adaptation signals while still supporting recovery.

Does quercetin improve athletic performance beyond recovery?

Evidence is modest but positive. The VO2 max improvements observed in RCTs (2–5%) are meaningful for performance. Elite athletes may see smaller relative improvements than untrained individuals.