The method for increasing lactose tolerance in subjects exhibiting lactose intolerance symptoms implements a protocol where the subjects ingest a gradually increasing amount of lactose containing product over a six week period. At various points during the six week period the subject ingests the lactose containing product once a day and then twice a day. The lactose containing product can be in liquid form, such as for example, milk, and is preferably in a powder form which is taken either by ingesting capsules having the lactose powder or in a granular form mixed with water or other non-lactose containing liquid. At the end of the six week period, the subject's tolerance for lactose containing products is substantially increased, with the potential of eliminating the subject's lactose intolerant behavior indefinitely.