Lemon is rich in vitamin C, sugar, calcium, phosphorus, iron, vitamin B1, vitamin B2, niacin, quinic acid, citric acid, malic acid, hesperidin, naringin, aroma Soybean extract, high amounts of potassium and low amounts of sodium, etc.

Lemon (scientific name: Citrus limon? (L.) Burm. f.), a citrus plant of the Rutaceae family, is also known as lemon fruit, lemon, mother fruit, etc. Small tree, branches with few thorns or nearly thornless, young leaves and flower buds dark purple-red, leaves thick and papery, oval or elliptical.

Single flowers are axillary or few flowers are clustered. The fruit is oval or oval, with thick peel, usually rough, lemon yellow, sour to very sour juice, small seeds, oval, pointed at the end; smooth seed coat, milky white cotyledons, usually single or multiple embryos. The flowering period is from April to May, and the fruiting period is from September to November.

Lemon is rich in vitamin C, which can reduce phlegm and relieve cough, promote body fluid and strengthen the stomach. It is used for symptoms such as bronchitis, whooping cough, loss of appetite, vitamin deficiency, heat stroke and polydipsia. It is the nemesis of "scurvy".

Lemon fruit is oval or egg-shaped, with narrow ends, and the top is usually narrow and elongated with papillary tips. The peel is thick, usually rough, lemon yellow, difficult to peel off, and contains oil spots rich in lemon aroma. The scoop capsule has 8-11 valves, the juice cells are light yellow, the juice is sour to very sour, the seeds are small, oval, and pointed at the end; the seed coat is smooth, the cotyledons are milky white, and they usually have single or multiple embryos.

Lemons are native to Malaysia and are distributed in the United States, Italy, France, the Mediterranean coast, Southeast Asia and the Americas. They are also cultivated in Taiwan, Fujian, Guangdong, Guangxi and other places in China.

The medical effects of lemon have long been recorded in ancient medical books. The "Compendium of Materia Medica" written by Li Shizhen, a pharmacologist of the Ming Dynasty, records that lemon has the functions of promoting body fluids, quenching thirst, and dispelling heat. Lemon juice is bitter, warm and non-toxic. "Lu Chuan Materia Medica" says that lemon fruit, peel juice, etc. have the effects of relieving stagnation, strengthening the stomach, relieving pain, and curing stagnation, abdominal pain, and inability to eat.

Modern medicine believes that lemon is a medicine and food for preventing cardiovascular disease. . Since citric acid combines with calcium ions in the human body to form a soluble complex, it can relieve calcium ions and promote blood coagulation. Therefore, patients with hypertension and myocardial infarction often drink lemon water, which is of great benefit to improving symptoms.