Whey protein concentrate and milk protein concentrate are included together to provide a blend of proteins that digest at different rates. Whey protein is known for its rapid digestion and high concentration of essential amino acids, particularly leucine, which quickly signals the body to start building muscle protein. Milk protein concentrate contains both whey and casein proteins in their natural milk ratio. Casein forms a gel in the stomach, leading to a slower, more gradual release of amino acids over several hours.
In a snack like this cookie, combining them aims to offer both a relatively quick initial protein supply from the whey and a longer-lasting, sustained release from the casein fraction. This can help promote a feeling of fullness for a longer period compared to whey alone and provides a steady stream of amino acids to support muscle maintenance between meals. It's a common approach in protein snacks designed to be more satiating. If you have an intolerance or allergy to milk-based ingredients, you should check the allergen information carefully before consumption.