Lactase is an enzyme that helps break down lactose, a sugar found in milk and milk products. Some peoples bodies do not make enough lactase, which can lead to lactose intolerance. Lactose intolerance can cause diarrhea, cramps, and gas. Taking supplemental lactase can help break down lactose and prevent these symptoms. Lactase is available as an over-the-counter, nonprescription product and is LIKELY SAFE for most people.

Lactase enzyme is normally produced by the body to help break down lactose, but lactose intolerance occurs when the body produces low amounts of lactase enzyme. Lactose intolerance can begin at different ages and is very common in adults. One way to treat lactose intolerance is to avoid milk products, but this can result in a lack of important nutrients and vitamins such as calcium, vitamin D, riboflavin, and protein. Some people use lactose-free milk or milk substitutes such as soy or rice milk. Most people with low lactase enzyme levels can tolerate small amounts of milk products at one time (2-4 ounces) and get symptoms only with larger servings (6 ounces or more) . Taking lactase enzyme with milk products as directed can help prevent upset stomach, abdominal bloating/cramping, gas, and diarrhea caused by these products.

Lactase is also used for excessive crying in infants (colic) and growth and development in preterm infants, but there is no good scientific evidence to support these uses. Lactase aids in the digestion of lactose present in dairy products and converts it to the simple sugars, glucose and galactose.