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Rennet

Low concern

FDA-approved processing aid for cheese; fermentation-produced chymosin is GRAS. Inactivated and largely removed in finished cheese.

Found in

3,333 products

What it is

A complex of proteolytic enzymes (chiefly chymosin) used to coagulate milk; sourced traditionally from animal stomachs or via microbial/fermentation-produced chymosin.

Coagulating enzyme for cheesemaking.

Why it's flagged

religious/dietary considerations (animal-derived vs microbial)

What regulators actually say

"FDA's GRAS Notice Inventory includes notices for fermentation-produced chymosin (e.g., GRN 35) used as a milk-clotting enzyme in cheesemaking."

FDA — GRAS Notice Inventory — fda.gov

Regulatory status

United States — FDA

Animal rennet GRAS by long use; fermentation-produced chymosin (GRN 000035, 116) GRAS.

European Union — EFSA

Authorized processing aid for cheesemaking.

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