Quercetin: a powerful antihistamine and antioxidant

Quercetin is a flavonol and a phytonutrient (a group of chemical compounds that can be found in plants and have numerous health benefits, but are not considered essential for human health). It is one of the best known phytonutrients and is a powerful antihistamine and antioxidant. In this article, I’ll take a closer look at quercetin and provide you with an overview of its main functions, the best food sources, the recommended daily allowances (RDAs), and the potentially adverse effects of consuming too much or too little.

1) DISCOVERY:

Quercetin was discovered by Hungarian biochemist Albert Szent-Gyorgyi in 1938 as part of the flavonoid family. Gyorgyi initially believed that he had discovered a new vitamin and named the flavonoids vitamin P. However, it was later discovered that, unlike vitamins, flavonoids are not essential for human health.

2) FUNCTION:

Quercetin is a very powerful flavonol and is a strong antihistamine (a substance that counteracts the effects of histamine and prevents allergies and inflammation) and antioxidant (a compound that protects your body from harmful free radicals that are released during reactions oxygen-related). It can also prevent heart disease (by lowering blood pressure and lowering levels of low-density lipoprotein (LDL) cholesterol in the blood) and acting as a treatment for diabetes (by lowering blood glucose levels and increasing blood glucose levels). insulin in blood).

Additionally, quercetin can also improve endurance during exercise and prevent multiple types of cancer (including breast cancer, colon cancer, gastric cancer, ovarian cancer, and prostate cancer). However, more research is required before these health benefits are confirmed.

3) RDA:

Since quercetin is not believed to be essential in humans, an official RDA has not been established. However, it is believed that between 200 milligrams (mg) and 500 mg should be consumed each day to achieve the health benefits mentioned above. It is also recommended that you consume no more than 1 gram (g) of quercetin per day.

4) FOOD SOURCES:

Quercetin can be found in a wide variety of plant-based foods. Some of the best food sources of this flavonol include apples (4.42 mg per 100 g), black tea (1.99 mg per 100 g), blueberries (14.02 mg per 100 g), dill (55.15 mg per 100 g), green tea (2.69 mg per 100 g). 100 g), red onions (19.93 mg per 100 g) and yellow hot peppers (50.63 mg per 100 g).

5) SYMPTOMS OF OVERDOSE:

Consuming up to 1 g of quercetin per day has not been linked to any adverse effects. However, exceeding this limit has been linked to a number of negative overdose symptoms including diarrhea, headaches, interference with anticoagulants (blood thinners) (which can cause uncontrollable bleeding), kidney damage, and stomach problems.

6) SYMPTOMS OF DEFICIENCY:

At the time of this writing, no deficiency symptoms associated with quercetin consumption have been reported.

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