bioflavonoid extract (quercetin)

Reported Doses

Safety/efficacy may not be established; reported doses may be derived from limited or potentially inadequate studies w/ variable regimens, multi-ingredient products, or where concentration of active ingredients may vary widely

Special Note, COVID-19

[no scientific data for COVID-19]

Info: see Herb & Supplement Remedy Use in COVID-19 Resources

Effectiveness Ratings

[see Herb & Supplement Effectiveness Rating Definitions table]

age-related cognitive decline

[Insufficient Evidence]

Dose: 110 mg PO qd

allergic rhinitis, adult pts

[Insufficient Evidence]

Dose: 100 mg PO bid

allergic rhinitis, peds pts

[Insufficient Evidence]

Dose: 150 mg PO qd x8-12wk; Info: for pts 6-12 yo; used w/ antihistamine in first 4wk of tx

aphthous ulcer (canker sores)

[Insufficient Evidence]

Dose: apply cream topically tid

asthma

[Insufficient Evidence]

Dose: 250-500 mg PO qd; Info: used w/ conventional tx

autism spectrum disorder, peds pts

[Insufficient Evidence]

Dose: 7 mg/kg/dose PO qd; Info: for pts 4-10 yo

beta-thalassemia

[Insufficient Evidence]

Dose: 500 mg PO qd

COVID-19

[Insufficient Evidence]

Dose: 200 mg PO tid x7 days, then 200 mg PO bid x7 days; Alt: 200 mg PO bid x30 days; 500 mg PO tid x7 days, then 500 mg PO bid x7 days; 500 mg PO bid x7 days; 260-1000 mg PO qd x7-30 days; Info: used w/ standard tx

cystitis, chemo-induced

[Insufficient Evidence]

Dose: 400 mg PO qam; Start: 7 days before 1st instillation

exercise-induced muscle damage

[Insufficient Evidence]

Dose: 500 mg PO bid

exercise-induced respiratory infection prevention

[Insufficient Evidence]

Dose: 500 mg PO bid

HTN

[Insufficient Evidence]

Dose: 100-1000 mg PO qd; Alt: 1095 mg PO x1

physical performance

[Insufficient Evidence]

Dose: 200-500 mg PO qd

polycystic ovary syndrome

[Insufficient Evidence]

Dose: 500 mg PO bid; Alt: 500 mg PO qd

prostatitis, chronic

[Insufficient Evidence]

Dose: 500 mg PO bid

renal transplant

[Insufficient Evidence]

Dose: 20 mg PO qd-bid; Start: w/in 24h of renal transplant; Info: used w/ anti-rejection tx

rheumatoid arthritis

[Insufficient Evidence]

Dose: 500 mg PO qd

URI

[Insufficient Evidence]

Dose: 1000 mg PO qd