XS Whey Protein powder contains Whey 83% (approx.),Calcium caseinate 3% (approx.) and Sodium caseinate 2%(approx.) Protein helps contribute to growth and maintenance of muscle mass. Benefits 1. XS Whey protein provide 30g of protein per serving and is formulated with 12g of essential amino acids and 2.8g of leucine. 2. These nutrients can behelpful in pre and post workouts.