What is Calcium Caseinate? Calcium Caseinate is a biologically-unique grade of protein derived from milk, & is low in fat, lactose & sodium. It boasts an impressive nutritional profile that is naturally rich in amino acids, protein & calcium. BULK POWDERS™ Calcium Caseinate is a premium, slow-release protein source that is the perfect choice for a pre-bedtime shake. A 30g serving provides 27g of slow digesting protein, which ensures a steady & sustained supply of amino acids to