The Claim
In trained cyclists, 28 days of daily quercetin supplementation (500 mg twice daily) is associated with a significant reduction in ferric reducing antioxidant power (FRAP) compared to placebo.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In trained cyclists, taking 500 mg of quercetin twice daily for 28 days is linked to a measurable decrease in systemic antioxidant capacity as measured by FRAP, compared to a placebo.
See the scientific wording
In trained cyclists, 28 days of daily quercetin supplementation (500 mg twice daily) is associated with a significant reduction in ferric reducing antioxidant power (FRAP) compared to placebo, suggesting that quercetin may lower systemic antioxidant capacity in this population despite its theoretical antioxidant properties.
When quercetin is taken daily, the body senses the extra antioxidant and reduces its own natural antioxidant production, leading to lower overall antioxidant power in the blood.
What the research says
1 studyIn trained cyclists, taking quercetin pills for a month made their body's antioxidant measure go down, not up — which is surprising because quercetin is supposed to help with antioxidants. The study found this drop was real and not just random.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.