Quercetin’s Remarkable and Surprising Anti-viral Activity | DonnieYance.com

Quercetin is a yellowish pigment that belongs to a group of plant compounds called flavonoids. As the most abundant flavonoid in the diet, quercetin is found in apples, onions, grapes, berries, broccoli, eucalyptus, tea, and blue-green algae.  In addition to its potent antioxidant qualities, quercetin is useful in the prevention and treatment of allergic reactions, cancer, heart disease, and inflammatory conditions such as psoriasis and urticaria.[1]  Another potentially less well-known benefit of quercetin is that it contains strong antiviral properties.

 

There are five main proposed mechanisms of action for quercetin’s antiviral activity:

  1. Inhibiting the ability of the virus to infect cells
  2. Inhibiting replication of already infected cells
  3. Reducing resistance of infected cells to treatment with antiviral medication
  4. Reducing virus-related hyper-responsiveness/inflammation (cytokine storm)
  5. Inhibiting viral production of heat shock proteins

 

Another antiviral mechanism of quercetin is its ability to inhibit replication in already infected cells.  One study confirmed quercetin’s ability to reduce viral internalization and replication in vitro, as well as viral load, lung inflammation and airway hyper-responsiveness in vivo.

The vibrant colors we observe in plants serve a different role depending on the organism being considered.  For the plant itself, the pigments may

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