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What is Quercetin?

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What is Quercetin?


Quercetin is a widely distributed bioflavonoid in the plant kingdom.


Quercetin has the properties of inhibiting tumors, fighting against free radicals, anti-oxidation, anti-inflammatory, anti-allergic, lowering blood pressure, lowering blood lipids, preventing and treating diabetic complications and immunoregulatory functions. It can treat and prevent cancer, aging, and cardiovascular diseases. It has important meaning.

Quercetin

Food sources of quercetin


The best dietary source of quercetin is onions. Eating a large onion, whether raw or cooked, is enough to significantly increase the level of quercetin in the body within a few hours. Apples also contain quercetin, but the body cannot absorb it effectively. We can absorb about half of the quercetin in onions, but only 30% of the quercetin in apples. If you want quercetin to help prevent disease,


The required intake is quite high, so you need to take quercetin supplements.


Quercetin and lung nodules


A study by the Maastricht University School of Medicine in the United States conducted a double-blind intervention experiment on two groups of nodule patients who were close in age and gender, did not smoke, and had never received relevant treatments, and found that:


Quercetin supplementation improves the body's antioxidant defense, which indicates that the total antioxidant capacity of plasma is increased. In addition, quercetin supplements also reduced the oxidative stress and inflammation markers in the blood of patients with sarcoidosis. And the higher the level of oxidative stress and inflammation markers, the more obvious the effect of quercetin supplements.


Source: Quercetin reduces markers of oxidative stress and inflammation in sarcoidosis, PMID: 21324570


Quercetin and chronic lung obstruction


A randomized, double-blind, placebo-controlled experiment conducted by the Institute of Lung Diseases of the University of Michigan in the United States divided patients with chronic pulmonary obstruction with a history of smoking for ten years or more into a placebo group, a 500 mg quercetin group, and a 1000 mg quercetin group As well as the 2000mg quercetin group, a 6-month observation experiment was carried out. The results showed:


No serious adverse events or major adverse changes in lung function occurred in any group. Quercetin supplements can effectively reduce the severity of the disease in subjects with chronic obstructive pulmonary disease. And it is recommended that patients with chronic pulmonary obstruction will use quercetin supplements as the first step as a therapeutic agent.


Source: Randomised clinical trial to determine the safety of quercetin supplementation in patients with chronic obstructive pulmonary disease, PMID: 32071149


Quercetin and cancer


Quercetin shows bright prospects in the treatment and prevention of cancer. Quercetin has shown a certain value in the treatment of leukemia, lung cancer, breast cancer, colon cancer and ovarian cancer.


A number of studies on mice have shown:


The protective effect of the mixture of curcumin and quercetin on the occurrence of lung cancer in mice.


Source: Protective effects of curcumin and quercetin during benzo(a)pyrene induced lung carcinogenesis in mice, PMID: 26004618


Another study on lung cancer showed:


Morphological and histological analysis of lung tumor nodules confirmed that the preventive treatment of curcumin and quercetin induced lung tumor cell apoptosis by regulating p53.


Source: Stimulatory effects of curcumin and quercetin on posttranslational modifications of p53 during lung carcinogenesis, PMID: 28681665


The usage and dosage of quercetin


Taking 300-600 mg of quercetin daily is the basic preventive dosage standard for quercetin to prevent heart disease and cancer. In case of need, it can be taken in an increased dose, no more than 600mg per time, and no more than 1200mg throughout the day.


Selection and purchase of quercetin


Quercetin products can choose European and American products with relatively strict quality control if conditions permit. The product ingredients are best to choose products labeled as quercetin dihydrate, because quercetin dihydrate is a more strict name for the medicinal raw material of quercetin. For daily health care and disease prevention, just choose a single quercetin product. For lung diseases, long-term smoking, cancer recovery, or middle-aged and elderly people, you can choose a combination product of quercetin + curcumin.


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