Applied Nutrition Critical Whey is a high quality, whey protein blend which has been formulated with the best ingredients to help you achieve your goals. Whey protein is essential when trying to create lean muscle & recovering. Whey protein contains amino acids which help with protein synthesis. This product provides you with 4.8g of branch chain amino acids per serving. These help protect muscles for a catabolic (muscle wasting) state to an anabolic (muscle growth) state.