What is this supposed to show? Lactose intolerance is because the digestive system of some folks is not able to completely break down the sugar found in milk called LACTOSE. This inability results from a shortage of the enzyme lactase, which is produced by the cells that line the small intestine. Hence, the term Lactase Deficiency. So, simply that Lactaid breaks lactose, a complex LARGE molecule, into smaller simpler sugars like glucose. Glucose can be absorbed into the blood stream. That's how it works. For lactose intolerant folks, they react poorly to trying to digest the large chain molecules present in lactose. However, the simpler sugars are easy to handle.