Functional beverage refers to a beverage that can adjust the human body's function to some extent by adjusting the composition and content ratio of nutrients in the beverage. According to the relevant data, functional drinks are classified, and it is considered that functional drinks in a broad sense include sports drinks, energy drinks and other drinks with health care functions. Functional drink is a kind of healthy drink popular in Europe, America, Japan and other developed countries since 2000. It contains electrolytes such as potassium, sodium, calcium and magnesium. Its composition is similar to human body fluids. After drinking, it can be absorbed by the human body more quickly, replenish the water and electrolyte (salt) lost by the human body due to a lot of exercise and sweating in time, and make the body fluid reach a balanced state.

Drinking functional drinks normally is harmless to human body, but drinking more is not recommended. Too much of anything is harmful.