Containing significant amounts of phosphorus, Casein is a protein that makes up about 80% of the protein content in cows milk (the remaining 20% being comprised of Whey). Known for its slow absorption rate and abundance of amino acids, Casein Protein is a popular choice among many athletes. Because Casein is a slow-digesting protein, amino acids enter and remain in the bloodstream at a steady rate, meaning that its effect on muscles can last several hours. Casein Protein contains branch chain amino...