Lactase (or β-galactosidase) is the enzyme (EC 3.2.1.23) involved in the hydrolysis of lactose to galactose and glucose. In humans, it is produced in the digestive tract. Deficiency of the enzyme causes lactose intolerance; most deficiency states are probably not due to defects in the lactase gene, but to mutations in the MCM6 gene.

GoldBamboo

... LACTASE (Dairyease®, Lac-Dos®, Lactaid®, Lactrase®, RiteAid® Dairy Relief™, Surelac®, Walgreens® Dairy Digestive™) is an enzyme that aids in the digestion of lactose. Lactose is a sugar is found in dairy products such as ice cream, cheese and milk. When the lactase enzyme is not present, lactose intolerance can occur after eating dairy foods and cause symptoms like diarrhea, stomach pain, bloating and gas. Lactase supplements can break down lactose and relieve symptoms related to lactose intolerance. Lactase supplements are available without a prescription from many different manufacturers.

...
Drug Digest - more...

Image:Lactase.png {{{caption}}} Lactase Identifiers Symbol(s) LC ...
Wikipedia - [full article]

Resources