Whey protein isolate is whey protein that is further refined and processed to remove fat, carbs and lactose, making it faster acting and more easily digested than regular whey protein as well as having a higher protein content (typically more than 85%). AST Sports Science VP2 is one of the most known and best selling whey protein Isolate and uses only hydrolyzed whey isolate which is a further step up from regular whey protein isolate and widely considered the premier protein source particularly for post workout use. Another popular whey protein isolate supplement is Dymatize ISO-100.