Joseph Mercola

Your immune system is your first-line defense against all types of infections, be they bacterial or viral, so the most effective way to prevent infectious illness — including in flnza — is a robust immune system.

Quercetin, a plant flavonol found naturally in apples, plums, red grapes, green tea, elderflower and onions, packs a powerful antiviral punch, inhibiting several strains of influenza, hepatitis B and C and other viruses.

Quercetin also combats inflammation and acts as a natural antihistamine.

Quercetin reduces viral illness and boosts mental performance following extreme physical stress, which might otherwise undermine your immune function and render you more susceptible to infections.

Its antiviral effects can be attributed to three main mechanisms of action: Inhibiting the virus’ ability to infect cells, inhibiting replication of already infected cells and reducing infected cells’ resistance to treatment with antiviral medication