Whey Protein Isolate also known as (WPI) is an Ultra Clean Low Carbohydrate and High Protein Filtered Whey Protein that takes the Whey ( Whey Protein Concentrate ) after Cheese Manufacturing seperating the Curds ( Used in Cheese Manufacturing ) They Whey left over is Called Whey Protein Concentrate . They Whey Protein Concentrate must go through a Filtration process to become a Whey Protein Isolate and during this process a large portion of the Lactose , Ash and Fat are removed making the Whey Protein Isolate Much Higher in Protein than the Whey Concentrate and Much easier for the Human Body to Absorb . There are Many sources of Whey Protein Isolate and many different types of Filtration used to take a Whey Protein Concentrate and Turn it into a Whey Isolate so each Manufacture of Whey Isolate will have a slightly different PCF  (Protein – Carbohydrate – Fat Profile) . At Suppkings Nutrition we sell the Highest Quality Whey Protein Isolates from Australia and the USA and Many of the Whey Isolates we sell have taken the Process of Filtration to the Next Stage beyond a Simple Whey Protein Isolate and put the Whey Isolate through another stage of Filtration called Hydrolysis which removes nearly 100% of the Lactose and Fat and makes the Whey Isolate even faster absorbing this Protein is Called a Hydrolyzed Isolate Protein and makes products like the RSP IsoLean and MuscleSport Lean Whey and ASN HP100 Protein which all have gone that Next Step in Hydrolysing the Whey Protein Isolate.