Lactase is an enzyme that breaks down lactose, the sugar in milk. Some people don't make enough lactase and are unable to digest lactose well on their own.
Lactase splits lactose to produce the sugars glucose and galactose. People who are lactose intolerant can experience cramps, diarrhea, and gas after consuming milk products.
People use lactase for lactose intolerance. It is also used for colic, growth and development in preterm infants, and many other conditions, but there is no good scientific evidence to support these uses.
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