Casein is a high-quality protein derived from milk. It is a slow-digesting protein that provides sustained release of amino acids, making it an excellent choice for muscle building and recovery. Casein is also rich in essential amino acids, which are important for overall health and wellness. It can be found in various dairy products such as milk, cheese, and yogurt, as well as in protein supplements. Casein is a great option for those looking to support muscle growth and improve their overall protein intake.