Can You Mix Protein Shakes and Leave Them Overnight ...
Protein can be found in many foods and also in the form of the protein powders you use to make protein shakes. Protein Powder Shakes. Protein powders come in three basic forms. They can be made from whey, casein or soy. Whey is milk-based, fast-digesting and dissolves easily in water. Casein is also milk-based, but it is a slow-digesting protein.