Optimum Nutrition 100% Gold Standard Whey Protein is the world's best-selling whey protein shake, supporting muscle growth and maintenance. It delivers 24 grams of premium whey protein per serving, along with 5.5 grams of naturally occurring BCAAs and 4 grams of glutamine. This formula is low in sugar and fat, with less than 120 calories per serving. It's an instantised, ready-to-mix powder perfect for consumption any time of day, whether mixed with water or added to meals and drinks. Available in a variety of flavors and serving sizes, it's designed to help active individuals support their fitness goals.