Quercetin

Uses

How it works

Benefits

Dosage & preparation

Preparation

Comparisons

Evidence quality

Where it comes from

Highlighted claims

• Quercetin is a natural antihistamine with no known side effects. — Clear Phlegm and Mucus From Lungs
• Quercetin is a flavonoid with antihistamine and anti-inflammatory properties supported by multiple studies. — The #1 Best Antihistamine Remedy for Sinus, Itching and Hives
• Quercetin is fat-soluble and absorbs poorly without dietary fat; taking it with coconut oil or butter maximizes absorption. — The #1 Best Antihistamine Remedy for Sinus, Itching and Hives
• The recommended quercetin dose is 400–600 mg every 2 hours, based on its approximately 2-hour half-life. — The #1 Best Antihistamine Remedy for Sinus, Itching and Hives
• Zinc inhibits viral RNA-dependent RNA polymerase intracellularly but requires an ionophore carrier to cross cell membranes. — COVID-19: Treatment, Pathophysiology, and Clinical Management — Clinical Q&A
• Quercetin reduces excess mucus production and inflammation in the airways. — Clear Phlegm and Mucus From Lungs
• Quercetin inhibits mast cell activity, reducing how much histamine enters circulation. — The #1 Best Antihistamine Remedy for Sinus, Itching and Hives
• Quercetin directly suppresses the histamine response beyond its effect on mast cells. — The #1 Best Antihistamine Remedy for Sinus, Itching and Hives
• Quercetin stabilizes the outer membrane of mast cells, preventing degranulation — the same core mechanism used by pharmaceutical antihistamines. — The #1 Best Antihistamine Remedy for Sinus, Itching and Hives
• Quercetin does not work for all people in every case and may require complementary supplements. — The #1 Best Antihistamine Remedy for Sinus, Itching and Hives