If you are mildly intolerant then it shouldn’t cause you any problems, as it contains a lot less lactose than milk. Dried skimmed milk powder and unfiltered dried whey contain 50-60% lactose, whereas our organic whey protein contains between 2-5% lactose. We have several mildly lactose intolerant customers who use our organic whey protein, with no problems at all. However, if you have a more moderate or strong intolerance to lactose then you should stay away :-)