Distinguish between north and south almonds: generally speaking, south almonds are large and flat, with thin skin, no bitterness and no toxicity; North almond is small, thick, dark, reddish, bitter and slightly toxic, so it can't be eaten raw. Its taste and medicinal effect are different. Although South Almond and North Almond are both called almonds, they are quite different in taste and medicinal effect. South almonds are mainly used for food, while North almonds are mainly used as medicinal materials, which are slightly toxic and cannot be eaten raw. South almond: South almond is sweet, also known as sweet almond. Mainly used for eating, it is rich in protein and plant fat, and has the functions of moistening dryness, nourishing lung and caring skin. South almond enters lung and large intestine. Relieving cough, moistening lung, relieving asthma, promoting salivation, stimulating appetite, relieving cough and asthma caused by fatigue and constipation caused by intestinal dryness. North almond: North almond tastes bitter, also known as bitter almond, which is mild in nature and can relieve cough and asthma, moisten the intestines and relax the bowels. Modern science has proved that trace hydrocyanic acid produced by amygdalin hydrolysis has sedative effect on respiratory center, so it can stop cough and relieve asthma, and can be compatible with Nanxing to strengthen lung moistening function. Hydrocyanic acid, which plays a key pharmacological role in almond, can calm the respiratory nerve center, relieve cough and asthma, but it has certain toxicity. Eating only twenty or thirty pills can make people poisoned or even fatal. North almond has good antitussive and antiasthmatic effects, so it is more suitable for diseases such as invasion of exogenous pathogenic factors, phlegm turbidity, cough with excessive phlegm, cold and cough, and is usually used with North almond in the preparation of medicinal diet. Usually, almonds are fried with warm fire, and the bitter taste is reduced by peeling, but the dosage should be controlled within 10 g to avoid harm to the body.