Our grass-fed whey protein isolate is 99.99% lactose-free, which is great for most with a lactose intolerance. However, please consult your physician prior to use if you have a lactose allergy. Whey protein isolate is the highest quality type of whey protein that is rid of extraneous content that often comes with poorer quality proteins. One of the things that is greatly reduced is the lactose content, a sugar found in most dairy products and cheap whey protein products.