Lemon is rich in vitamin C, which has many functions such as anti-bacterial, improving immunity, and assisting in the production of collagen. Drinking lemonade regularly can supplement vitamin C. Drinking 500 to 1000 ml of lemonade a day when you have a cold can relieve a runny nose, and the cold will dissipate quickly, especially when you have just caught a cold, you can heal it without medicine. In addition to antibacterial and immune enhancement, it also has the effects of appetizing, digesting, promoting body fluids, quenching thirst, and relieving heat.