Optimum Nutrition Gold Standard 100% Whey Isolate is hand-picked finest whey protein and run it through some fancy filters to get rid of extra fat, cholesterol, and sugar. Some of this Whey Protein Isolate is also hydrolyzed – broken down into shorter chains of amino acids – to make it easier to digest. The end result is a quick-digesting protein that's over 80% pure and has less than 1 gram of carbs and fat in each serving. Optimum Nutrition put in the effort to guarantee top-notch quality, so you can focus on reaching your big performance goals.