Lactase is mainly taken by lactase deficient people after eating dairy products to help the body break down lactose, and can also be used for long-term prevention, but should also be standardized under the guidance of a doctor. Lactose is mostly found in milk, dairy products, etc. After eating, the body needs lactase enzyme to break down lactose, but if a genetic mutation occurs, it will lead to a lack of lactase enzyme at birth, which is manifested in diarrhea, flatulence, intestinal cramps and other discomforts after eating dairy products, so it needs to be supplemented with lactase enzyme from an exogenous source. Lactase capsule is the exogenous provision of lactase enzyme, if after eating lactose products, you need to take oral lactase capsule to break down lactose to avoid discomfort. Lactase capsules are safe, have no known side effects, and are safe for long-term use to prevent discomfort caused by lactose intolerance. People with lactase deficiency should avoid milk and drink milk with less lactose in their daily life.