More than 30 kinds of health care substances contained in citrus fruits have been isolated, mainly including flavonoids, monoterpenes, coumarins, carotenoids, propanoids, acridones, glycerol glycolipids, etc.

Flavonoid there are three types of flavonoids in citrus fruits: type ⅰ is a general flavonoid represented by rutin; Type ⅱ is a flavanone peculiar to citrus fruits such as hesperidin and naringin; Type ⅲ is a special flavonoid containing polymethoxyl, which is not found in other vegetables and fruits but only in citrus.

There are many varieties of citrus, which have the common advantage of rich nutrition. The juice is rich in citric acid, amino acids (amino acid food), carbohydrates, fats, vitamins (vitamin food), calcium (calcium food), phosphorus, iron (iron food) and other nutrients. They are one of the best foods for pregnant women.

500 grams of citrus contain 250 mg of vitamin C, 2.7 mg of vitamin A and the highest content of vitamin B1 among fruits. Calcium is the highest mineral in citrus, and the content of phosphorus is also higher than that of rice. The peel and core of citrus are famous traditional Chinese medicine. Eating citrus regularly can prevent scurvy and night blindness.

In autumn and winter, a large number of citrus are on the market. Fresh citrus pulp is rich in vitamin C, which can improve the body's immunity. At the same time, citrus can reduce the risk of cardiovascular disease, obesity, and diabetes. Although citrus is delicious, do not exceed 3 citrus a day. It is enough for people to eat 3 citrus of vitamin C per day. Eating too much will be bad for the mouth and teeth. At the same time, citrus contains leaf red substance. If you ingest too much, the content in blood will suddenly increase and accumulate in the skin, making the skin of subcutaneous fat rich parts, such as palms, fingers, feet, nasolabial groove, and the edge of nostrils yellow.