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Rennet 101

Microbial Rennet vs. Animal Rennet

Short answer

Microbial rennet is produced by fermentation; animal rennet is extracted from the stomachs of young ruminants. Both coagulate milk. The practical differences are dietary suitability, tradition, and how each behaves during long ripening.

By Bixa Products, Editorial teamUpdated February 2, 20266 min read
Microbial rennetAnimal rennet
SourceMicrobial fermentationStomachs of young ruminants
Suitable for vegetariansCommonly yesNo
Typical useFresh cheeses, everyday artisan and commercial productionTraditional and protected-designation styles
Long ripeningWidely used; behaviour varies by productLong-standing traditional choice

Does one make better cheese?

That framing is the wrong one. Both categories coagulate milk reliably when dosed correctly. Cheese quality is decided across the whole make — milk selection, culture, temperature, pH management, cutting, draining, salting and ripening.

Coagulation is never controlled by one variable. Milk composition, temperature, pH, calcium, the cheese style and your process conditions all shape how the curd forms — the coagulant is one input among several.

How to choose

  • Are you making cheese for vegetarian consumers or retail with a vegetarian claim?
  • Are you making a traditional style with a defined method?
  • Do you need consistent supply and predictable dosing at growing volumes?
  • Are you aging the cheese, or selling it fresh within days?

About the author

Bixa ProductsEditorial team

Educational content written by the Bixa Products team, a family-owned cheesemaking ingredient company specializing in rennet and chymosin. Technical guidance is written conservatively: where a value depends on your milk, process or product, we say so instead of guessing for you.

  • Family-owned cheesemaking ingredient company
  • 30+ years in the Latin American cheesemaking market
  • Specialists in rennet, chymosin and milk coagulation

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Microbial rennet is a milk-coagulating preparation produced by microbial fermentation rather than taken from animal stomachs. It does the same job in the vat: destabilising milk protein so a curd forms.

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