What happens if I forget to refrigerate my Kefir and it stays out for a few hours?

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Accepted Answer

The live cultures will become very active, causing the Kefir to separate and build pressure. It is still likely safe to consume, but the taste will be significantly more sour and fizzy. Refrigerate it immediately and open the cap slowly.

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Question: What happens if I forget to refrigerate my Kefir and it stays out for a few hours?