Whey Protein Isolates are 90% pure protein by weight. They are the purest and most expensive form of whey protein that exists. That's why they are the first ingredients you read on the 100% Whey Gold Standard(TM) label. By using Whey Protein Isolates as our primary protein source, we're able to pack 24 grams of the purest muscle-building protein per serving, and a lot less of the fat, cholesterol, lactose, and other stuff that you can do without. There's no question this is the standard by which other whey proteins are measured. Impact Level: Low - Light level of support. Ideal for activities like yoga, stretching, Pilates and barre. High - Maximum level of support. Ideal for high intensity workouts and larger busts. Medium - Mid level of support. Ideal for activities like light gym training, jogging, and cycling. Fit & Design: Made with whey protein isolates-the purest form of whey protein that exists Optimum Nutrition(R) 100% Whey Gold Standard protein powder delivers 24 grams of muscle building protein per serving Helping to support muscles and muscle-building post-workout Whey protein is instantized, making is easy to mix or stir into a protein shake