Quercetin is a naturally occurring flavonoid compound that is widely distributed in a variety of plants, especially in foods such as apples, onions, grapes, berries, green tea, and red wine.
Its chemical structure is characterized by polyphenolic hydroxyl groups, which give it significant antioxidant capacity, neutralizing free radicals and reducing oxidative stress damage to cells.

Studies have shown that quercetin has a variety of biological activities:
1. Anti-inflammatory effect: By inhibiting the release of inflammatory mediators, it may relieve chronic inflammatory-related diseases.
2. Cardiovascular protection: It may improve vascular function, lower blood pressure, and inhibit low-density lipoprotein oxidation, thereby reducing the risk of atherosclerosis.
3. Immunomodulation: Some experiments suggest that it may inhibit the release of histamine and relieve allergic reactions.
4. Anti-cancer potential: In vitro studies have shown that it can induce cancer cell apoptosis and inhibit proliferation, but clinical evidence is not yet sufficient.

Application
In the field of medicine: Quercetin has been studied for medical applications due to its biological properties such as antioxidant, anti-inflammatory, antibacterial, antiviral, free radical scavenging, and immune regulatory activities.
In the field of Food antioxidants, used in oils, beverages, cold drinks, meat processing products
Edible yellow pigment;
In the field of Dye (medium dye), used for wool and cotton, yellow can be obtained with aluminum salts; olive yellow can be obtained with chromium salts, orange can be obtained with tin salts, and olive green can be obtained with iron salts; Very good resistance to soap washing, medium resistance to sunlight.
Quercetin has many beneficial effects on the human body and can help prevent and relieve a variety of diseases. However, quercetin is not a panacea and cannot completely replace traditional medical treatment. When using quercetin, it is recommended to follow the doctor's advice and combine it with other treatments to achieve the best therapeutic effect.
Dosages of Quercetin
Optimal doses of quercetin have not been established for any specific conditions by the FDA or any other governing health authority at this time, so it's up to you and your doctor to decide what amount works best for you.
Quercetin supplements are available in all types of pills or capsules and are commonly used in formulas along with other anti-inflammatory ingredients. For example, quercetin with bromelain (an anti-inflammatory enzyme found in pineapples) may be taken to help manage allergies.







