Supreme Casein – Quality Protein Around the Clock Supreme Casein combines high-quality milk protein and calcium caseinate in a delicious, easy-mixing protein drink. Its slow-digesting protein profile makes it an excellent choice between meals or before bedtime when you want to support your daily protein intake. Enriched with lactase enzyme, packed with protein, and great-tasting, Supreme Casein is a reliable companion for an active lifestyle. Protein contributes to the maintenance and growth of muscle mass.