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Rennet 101

How to Store Liquid Rennet

Short answer

Liquid rennet loses clotting activity with heat, light and time, so it is kept cool, closed and out of direct light, and used within the period stated on its label. Always follow the storage instructions supplied with your specific product.

By Bixa Products, Editorial teamUpdated March 12, 20264 min readReviewed by Luis

The three things that cost you activity

  • Heat — the biggest one. A bottle left on a warm bench loses more than most people expect.
  • Light — keep it in its original container, away from direct light.
  • Time — activity declines gradually even under good storage.

Handling habits that protect a batch

  1. Take the bottle out, dose, and put it straight back into cold storage.
  2. Never dilute in warm or chlorinated water.
  3. Never return diluted coagulant to the bottle.
  4. Label the bottle with the date it was opened.

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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Rennet 101

Does Rennet Expire?

Yes. Rennet loses clotting activity over time, and faster if it has been stored warm or in light. A familiar dosage giving a slower set than usual is one of the most common signs of a coagulant past its best.

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