Walgreens Fast-Acting Lactase Enzyme is designed to help people with lactose intolerance digest dairy products more comfortably. The enzyme works by breaking down lactose, the sugar found in dairy, into simpler sugars that are easier to digest. This can reduce or eliminate symptoms such as bloating, gas, and stomach discomfort that occur after consuming dairy. The "fast-acting" feature suggests that the enzyme works quickly to provide relief, typically within a short period after taking it. It's commonly available over the counter and can be taken before consuming dairy-containing foods or beverages.