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? Lactaid helps prevent symptoms by breaking down milk sugar (lactose) and making dairy foods easier to digest. It is not a drug, but a dietary supplement containing the natural lactase enzyme. Lactaid works naturally and may be used by everyone ages 4 years and up. Why is Lactaid fast act better than ultra? Lactaid starts working quickly, so more milk sugar (lactose) can be broken down overall. Lactaid starts working more than two times faster than any ultra strength product available. Same convenient single pill dose. How do you use Lactaid fast act supplement? Swallow 1 caplet with your first bite of dairy food. If necessary, you may swallow 2 caplets at one time. If you continue to eat foods containing dairy after 30-45 minutes, we recommend taking another caplet. How often can you use Lactaid Fast Act Supplement? Lactaid Fast Act Supplement may be used every time you eat foods containing dairy. Can be used with every meal and snack, every day.