Casein protein is a slow-digesting dairy protein found in milk, making up about 80% of its protein content. It is often used in protein supplements and is popular among athletes and bodybuilders for its ability to provide a steady release of amino acids over several hours. This slow absorption can help with muscle recovery and growth. Unlike whey protein, which digests quickly, casein forms a gel-like substance in the stomach. This property helps to prolong feelings of fullness, making it a suitable option for those looking to manage their weight. Additionally, casein is rich in essential amino acids, supporting overall health.