How is Casein Protein Powder made?

Casein protein powder is made in a similar method as to how cheese is made from milk. Generally acid or heat is applied to milk as a curdling agent, which separates the solids from the liquid. This process causes the curds to clump together and float to the surface where they can be skimmed off. These casein curds are then dehydrated and powdered for use as a supplement.