Quercetin, also known as quercetin, soluble in glacial acetic acid, alkaline aqueous solution is yellow, almost insoluble in water, ethanol solution tastes very bitter. It can be used as a medicine with good expectorant and antitussive effects, and has a certain anti-asthmatic effect. In addition, it has the effects of lowering blood pressure, enhancing capillary resistance, reducing capillary fragility, lowering blood lipids, dilating coronary arteries, and increasing coronary blood flow. Used to treat chronic bronchitis. It also has adjuvant therapy for patients with coronary heart disease and hypertension.

Quercetin exists in the flowers, leaves and fruits of many plants, mostly in the form of glycosides, such as rutin, quercetin, hyperoside and other plants with higher content.Quercetin is a chemical found naturally in a number of foods including apples, onions, teas, berries, and red wine. This flavonoid is also found in some herbs such as ginkgo biloba and St. John’s wort.

Health benefits of quercetin:

1.Quercetin has antioxidant properties.

Antioxidants work to protect the body from free radicals. Free radicals are unstable molecules in the body that can increase the risk of disease and quicken aging.

Quercetin is a more powerfulTrusted Source antioxidant than vitamin C, vitamin E, or beta carotene.

2.Reducing inflammation

quercetin might help reduce inflammation. One studyTrusted Source on animals found that quercetin prevented both acute and chronic inflammation, in addition to showing anti-arthritis properties.

3.Reducing the risk of cancer

Quercetin may contain anticancer properties that might help prevent the spread of cancerous cells and tumor growth.

4.Preventing neurological diseases

Quercetin may help to prevent neurodegenerative diseases, such as Alzheimer’s or Parkinson’s disease.

5.Relieving allergy symptoms

Quercetin has antibacterial properties, which are effective against almost all types of bacteria, along with other flavonoids, might help fight off viruses.

6.Preventing infections

7.Reducing the risk of heart disease

Quercetin may improveTrusted Source blood vessel cell health and blood flow through arteries in people with heart disease.

8.Lowering high blood pressure

Taking quercetin supplements could be an effective way to reduce blood pressure.

Side effects and risks

The natural antioxidants found in fruits and vegetables can be very beneficial when consumed as part of a balanced and nutritious diet.

The United States Food and Drug Administration (FDA) class quercetin as a generally safe substance.

Some people reported minor side effects when taking high doses of quercetin, such as 1,000 mg per day, long-term.

Side effects may include:

The side effects of quercetin usually occur shortly after high-dose intake, especially acid reflux is the most common. Taking quercetin during or immediately after a meal can effectively avoid such minor side effects. Other negative effects that quercetin can cause include increased inflammation in the body. Although antioxidants can protect the body from inflammation, large doses can easily cause adverse effects and induce inflammation. Joint pain and stiffness are common manifestations of this side effect.

Other possible side effects include abnormal changes in hormone levels in the body. For example, estrogen as a female hormone is particularly susceptible to high levels of quercetin. A study found that premenopausal women who took supplements containing quercetin had significantly higher blood estrogen levels than women who took supplements that did not contain quercetin. Excessive levels of estrogen are known to be potentially linked to high risks of female reproductive system cancer and breast cancer.

1. Quercetin is toxic and can easily cause nausea, vomiting, chest tightness, shortness of breath, breathing disorders, and even coma if swallowed directly.

2.It should not be in direct contact with the skin because quercetin can damage the skin and is prone to symptoms of eczema, urticaria, and impetigo. Once the energy is applied, it should be washed immediately with soap and water.

3.Quercetin can damage the spleen and stomach, easily causing symptoms such as loss of appetite, abdominal pain, hyperacidity and indigestion.

4.Quercetin has teratogenic effects, so pregnant women should not use it

The main applications of quercetin:

1.Antioxidant. Mainly used for fats, beverages, cold drinks, meat processed products.

2.A natural dye. Can be used as a medium dye. Used for wool and cotton, aluminum salt is used to obtain yellow, chromium salt is used to obtain olive yellow, tin salt is used to obtain orange, and iron salt is used to obtain olive green. Good soaping resistance, medium light resistance.

Quercetin supplements :

You can purchase quercetin as a dietary supplement online and from health food stores. It’s available in several forms, including capsules and powders.On its own, quercetin has a low bioavailability, which means your body absorbs it poorly That’s why the supplements may include other compounds, such as vitamin C or digestive enzymes like bromelain, as they may increase absorption .Additionally, some research indicates that quercetin has a synergistic effect when combined with other flavonoid supplements, such as resveratrol, genistein, and catechins.

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