Casein Peptone is enzymic digest of casein. It is manufactured under controlled conditions. Casein being a rich source of amino nitrogen, the hydrolysed product casein peptone obtained also contains peptides, aminoacids etc. which acts as nitrogen source for microorganisms when used in media.

Peptone, a protein decomposition product, is made by incomplete hydrolysis process of the protein originated from beef, casein, milk powder, gelatin, soy protein, silk protein, fibrin, etc. The commercially available products are mainly light yellow to brown yellow powder.