Take with your first bite. Lactaid is a dairy digestive supplement that contains a natural enzyme. Lactaid breaks down lactose, a milk, sugar, making dairy foods easier to digest. If you are experiencing gas, bloating, or diarrhea after eating dairy foods due to difficulty in digesting lactose, Lactaid is right for you. (This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.)