Whey Protein is available in many forms, concentrate is the most popular which generally comes in at 80% as a raw material, and Isolate is used more for dieting or people with lactose intolerance. 

Whey protein Isolate is classed as the purest form of protein with virtually 0% lactose and will stir quite easily into water or juice, this provides a massive 90g of protein per 100g of powder. 

Whey protein Concentrate provides around 80g of protein per 100g of powder, has slightly more lactose and some fat and carbs in it. Both products are flavoured in various forms and blends and all product come with comprehensive nutritionalal info and amino acid profiles.