Lactase is an enzyme (a protein that causes a chemical reaction to occur) normally produced in your small intestine that's used to digest lactose.

Where is lactase usually found or secreted?

This enzyme helps to digest lactose, a sugar found in milk and other dairy products. Lactase is produced by cells that line the walls of the small intestine.

Where can we commonly find lactose?

Lactose is found mainly in milk and dairy products such as cow's milk, goat's milk, yogurt, cheese and ice cream. It can also be an ingredient in foods and beverages like bread, cereal, lunchmeats, salad dressings and mixes for baked goods.