What is the name of the sugar found naturally in milk?

Lactose is the sugar that occurs naturally in milk and dairy products. It is a disaccharide composed of two simpler sugars: glucose and galactose. Lactose plays an important role in the nutrition of infants, as it provides energy and aids in the absorption of calcium and other minerals. Individuals who are lactose intolerant have difficulty digesting this sugar due to insufficient levels of lactase, the enzyme that breaks down lactose in the digestive system.

Fructose is found in fruits and honey, sucrose is common table sugar derived from sugarcane or sugar beets, and glucose is a simple sugar that is a primary energy source for cells. Each of these sugars has distinct sources and functions in nutrition, setting them apart from lactose, which is specifically associated with dairy products.