LACTAID Fast Act helps prevent the gas, bloating or diarrhea that many people may experience after eating foods containing DAIRY.* How does LACTAID Fast Act Supplement work Helps to PREVENT symptoms by breaking down milk sugar (lactose) and making dairy foods easier to digest. NOT A DRUG, but a dietary supplement containing the natural lactase enzyme. Works naturally and may be used by everyone ages 4 years and up. Why is LACTAID Fast Act better than Ultra Starts working quickly, so more milk sugar (lactose) can be broken down overall.** Starts working more than TWO TIMES FASTER than any Ultra strength product available.** Same convenient single pill dose. **Based on simulated lactose digestion studies.