The advantage of lactose-free milk is that it can improve the tolerance of milk, because many people lack lactase in the gastrointestinal tract, and the lactose in ordinary milk containing lactose is not well decomposed, metabolized and utilized, and then accumulates in the intestines and causes bloating, diarrhea, abdominal pain and other gastrointestinal discomfort. If people with lactase deficiency drink lactose-free milk, they can avoid the stimulation of excessive lactose to the gastrointestinal tract, resulting in abdominal pain, bloating, diarrhea and other intolerances, which is very beneficial to improve the tolerance of milk and absorb other high quality proteins, calcium and other nutrients.