Functional beverage
A functional beverage is a conventional liquid food marketed to highlight specific product ingredients or supposed health effects.
Beverages marketed as "functional" include dairy drinks, sports and performance drinks, energy drinks, ready-to-drink teas, kombucha, "smart" drinks, fortified fruit drinks, plant milks, and enhanced water. Although these beverages may serve to hydrate a consumer, they have no proven health effects, and accordingly appear not to be "functional". For example, there is no good clinical evidence that kombucha provides any benefit to human health.