Whitening due to lemon vitamin content is extremely rich, so lemonade is a good beauty, can prevent and eliminate skin pigmentation, play a whitening effect; prevention and treatment of cardiovascular disease Drinking lemonade can also prevent and control cardiovascular disease, because lemonade can alleviate calcium ions prompted by the blood coagulation effect, so it can be prevented and assisted in the treatment of hypertension and myocardial infarction; treatment of kidney stones Lemonade contains a large amount of citrate, which can inhibit calcium salt crystallization, thus preventing the formation of kidney stones can even make part of the chronic kidney stone patients reduce, change. Lemon water contains a large amount of citrate, which can inhibit the crystallization of calcium salts, thus preventing the formation of kidney stones, and can even make some patients with chronic kidney stones to reduce the number of stones, become less.