1, efficacy and function: improve human metabolism: water chestnut is rich in phosphorus, can promote human growth and development, promote the metabolism of substances, but also can regulate the acid-base balance, cough and phlegm: water chestnut is cold in nature, there is a certain clearing of heat to stop coughing and phlegm and other effects.

2, contraindications: horseshoes cold, women's menstruation, cold spleen and stomach, as well as blood deficiency, blood sludge should be used with caution.

3, side effects: lead to diarrhea, aggravate stomach cold, induce parasitic diseases.