Lactase is a enzyme that is found in the milk of most mammals. It helps to digest the milk sugar lactose.

  • Most people lose their lactase after they reach adulthood.

  • Some people are able to produce lactase even when they are not drinking milk.

Definition of lactase


any of a group of enzymes (trade name Lactaid) that hydrolyze lactose to glucose and galactose



Nearby Words

lactase Pronunciation in a video

Example Sentences for lactase

  • 1

    Lactase can hydrolyze a variety of substrates.

  • 2

    Probiotics compensation for lactase insufficiency.

  • 3

    Lactase is used in the conversion of whey into syrup.

  • 4

    Lactose intolerance and lactase deficiency are not synonyms.

  • 5

    Deficiency of lactase in humans causes lactose intolerance.

  • 6

    For others see discussion on lactase page for details.

  • 7

    Humans are born with high levels of lactase expression.

  • 8

    A genetic disorder which prevents enzymatic production of lactase.