Applied Nutrition Critical Whey Protein is a blend of whey protein concentrate, isolate, and hydrolyzed whey designed for muscle growth and recovery. It provides about 24g of protein per serving, is rich in BCAAs and glutamine, and is tested for quality and banned substances. The product is caffeine-free by default but some flavored versions include caffeine, and it is gluten-free, halal certified, and can be mixed with water or milk.