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Can quercetin help reduce upper respiratory tract infections?

Quercetin is a naturally occurring plant pigment called a flavonoid, commonly found in sophora japonica extract and onion extract. It has been the subject of scientific research for its potential health benefits, including its role in reducing the risk of upper respiratory tract infections.


Several studies have suggested that quercetin may have antiviral and anti-inflammatory properties that could help reduce the incidence and severity of upper respiratory tract infections. One study published in the journal "Nutrients" in 2016 found that quercetin supplementation was associated with a significant decrease in the frequency and duration of respiratory infections in physically active individuals.


Another study published in the "American Journal of Physiology-Lung Cellular and Molecular Physiology" in 2014 reported that quercetin may help protect against influenza infection by modulating the immune response and reducing inflammation in the respiratory tract.



Quercetin is believed to exert its beneficial effects on respiratory health through several mechanisms. It has been shown to inhibit the replication of certain viruses, including those that cause respiratory infections such as the common cold and influenza. Additionally, quercetin has been found to possess antioxidant properties, which may help protect the respiratory tract from oxidative stress and inflammation.


Furthermore, quercetin has been shown to modulate the immune response by regulating the production and activity of immune cells and inflammatory mediators. This immunomodulatory effect may help reduce the severity of symptoms associated with upper respiratory tract infections and support the body's natural defense mechanisms against viral pathogens.


While the existing research on quercetin benefits and its potential role in reducing upper respiratory tract infections is promising, more high-quality clinical trials are needed to confirm these findings and establish specific recommendations for its use. It is important to note that individual responses to quercetin supplementation may vary, and its efficacy in preventing or treating respiratory infections may depend on various factors such as dosage, duration of use, and the presence of other health conditions.


In conclusion, quercetin shows promise as a natural compound that may help reduce the risk of upper respiratory tract infections through its antiviral, anti-inflammatory, and immunomodulatory properties. However, further research is warranted to fully understand its potential benefits and establish evidence-based guidelines for its use in supporting respiratory health.

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