The world's best-selling whey protein delivers 24 grams of protein with 120 calories This superior quality powder has been instantised to mix easily using a shaker cup. Help kick start your muscle growth with Optimum Nutrition's Gold Standard 100% Whey. There's no doubt that this is the gold standard by which all other whey proteins are measured. The world's best-selling whey protein delivers 24 grams of protein with 120 calories This superior quality powder has been instantised to mix easily using a shaker cup. Help kick start your muscle growth with Optimum Nutrition's Gold Standard 100% Whey. There's no doubt that this is the gold standard by which all other whey proteins are measured.