It is rather simple. The usual protein products are made with whey concentrate, which is full of lactose. On the other hand, there are protein products that are made completely with whey isolate, which is the purest form of whey protein, as it has no lactose in it. For instance, the Isolation is made with whey isolate only, and has no unnecessary additives or sweeteners. Besides, they have it with the Colombian Espresso flavor, which is amazing in my opinion.