Calcium caseinate is a milk protein with calcium added to make it water soluble. It digests slowly and releases amino acids steadily over several hours.
Athletes take it before bed or during long stretches without food. The slow delivery keeps protein synthesis working overnight.
Mix the powder with water, milk, or a smoothie. Drink it 30 to 60 minutes before sleep. Some people use it as a meal replacement or between meals.
Skip this if you have a milk protein allergy. It contains less lactose than many dairy products, but it can still upset a sensitive stomach. Talk to a doctor before using it if you have kidney disease.