Lactase (digestive enzyme): benefits, dosage, contraindications

Lactase is an enzyme in the intestine that breaks down lactose into glucose and galactose. Some people are "lactose intolerant" and are unable to break down lactose on their own. This can cause cramps, diarrhea, and gas, prompting them to avoid milk and dairy products. Lactase is actively produced during childhood when milk is the primary source of nutrition. The enzyme then becomes less active after the weaning phase, significantly decreasing in adulthood. However, production is uneven; 70% to 80% of Caucasian individuals produce this enzyme in adulthood, but it's the case for only about 10% of Asian individuals. Commercially available lactase is derived from Candida pseudotropicalis or Kluyveromyces lactis. Taken orally, lactase is used for lactose intolerance and colic.