People with lactose intolerance can tolerate kefir. Lactose intolerance is a common digestive problem caused by too little production of an enzyme called lactase in the small intestine, which the body needs to digest lactose (milk sugar). Without lactase enzyme, lactose is hard to digest and break down by our gut. During the fermentation, most of milk’s lactose turns into lactase enzyme. The result is a 99% lactose-free kefir with the lactose replaced by lactase enzymes that help you digest the lactose in the long run.