What is soy protein isolate a natural alternative to lactose based proteins soy protein isolate is made from 100 non gmo soy beans that have been stringently processed to remove the vast majority of fat and carbohydrate content the result is a highly refined powder with over 90 protein content and minimal fat and carbohydrates completely dairy free why use soy protein isolate low in fat and high in protein soy protein isolate helps contribute to the growth and maintenance of muscle m