Quercetin is a bioflavonoid compound found in many plants – especially in fruits and vegetables. It can be found in high quantities in red wine, onions, green tea, apples, berries, and Gingko Biloba. In the past, people used Quercetin as a way to prevent illness, to help with asthma and regulate the immune system. Today, Quercetin is sold as a dietary supplement for supporting a healthy body.
Quercetin side effects are uncommon as this is considered to be one of the safest supplements you can take. However, Quercetin has a number of interactions, especially with certain medications like antibiotics and blood-thinning medicine.
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