463 Quercetin [19 March 2018]

Quercetin is a plant pigment (which give color to plants) in the flavonoid family. As a food ingredient, and as a supplement, quercetin has many benefits for our health.

An important benefit of quercetin is its antiviral properties. Animal and clinical studies have shown that quercetin inhibits many viruses, including rhino-viruses, influenza A and B, herpes simplex type 1, hepatitis B and C, and others, preventing replication and transmission. When used with antiviral drugs, quercetin increased the drugs’ effectiveness. Quercetin also lowered the risk of secondary bacterial infections (the primary cause of influenza deaths) and has shown antibacterial effects on Staph infections. There is some concern however that quercetin may reduce the effectiveness of some anti-bacterial antibiotics.

Another important benefit is quercetin’s anti-inflammatory and anti-histamine effects which reduce symptoms in allergic conditions like rhinitis and bronchial asthma. Quercetin decreases production of pro-inflammatory cytokines, thus reducing inflammation in conditions such as rheumatoid arthritis.

In addition, quercetin is a potent antioxidant, protecting cell membranes and DNA from free radical damage, especially important for smokers. Quercetin protects the liver from toxic stress by increasing glutathione production.

Good food sources of quercetin include: onions, broccoli, green tea, berries, pomegranates, and red wine. It also occurs in some medicinal herbs: ginkgo biloba, St. John’s Wort, and especially in elderberries (which have known anti-viral properties).

Some cautions – quercetin may slow the breakdown of certain medications in the liver, effectively increasing the dose. If you are taking antibiotics or any prescription drugs, talk to your doctor or pharmacist first before taking quercetin supplements. There is also a possibility of kidney damage with very high doses of quercetin. Quercetin may affect thyroid function. For these reasons it is advised to avoid high doses for a prolonged time.

In summary, consider taking quercetin for allergies, colds and flu (prevention and treatment), arthritic pain and inflammation, and for cell protection from smoking and environmental toxins. Follow directions on the bottle.

Sources:
Mercola: Quercetin - a Far Better Flu Remedy than Tamiflu - Feb 26, 2018
Learn About Quercetin's Possible Benefits for Your Health - undated
Self-Hacked: 22 Scientifically Proven Health Benefits of Quercetin - updated January 18, 2018
WebMD: Quercetin
Quercetin and Its Anti-Allergic Immune Response, Molecules, May 2016

For more information on this or other natural health topics, stop in and talk to Stan; for medical advice consult your licensed health practitioner.