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Rennet is a milk coagulant that is the concentrated extract of rennin enzyme obtained from calves’ stomachs (calf rennet) or adult bovine stomachs (bovine rennet). The commercial saline extract of rennin contains a little pepsin, some sodium chloride, and some boric acid, sodium benzoate, or propylene glycol as a preservative. In the paste form, it also contains lipase. In the paste form it is used in italiantype cheeses. It is used to coagulate milk into curd in making cheese and junket. A microbial rennet and a pepsin rennet also exist.