Analysis by Dr. Joseph Mercola STORY AT-A-GLANCE Quercetin is a natural antihistamine with anti-inflammatory, antioxidant and antiviral properties This natural flavonoid is useful for boosting heart health, relieving allergy symptoms, supporting liver health and more Quercetin acts as a zinc ionophore, helping to shuttle zinc through the cellular membrane and into the cell, which is crucial for stopping virus replication Rich sources of quercetin include apples — especially the skins — onions, broccoli, cherries, berries and green tea I recommend keeping quercetin in your medicine chest for times when you feel you’re coming down with something, such as a cold or
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