Why doesn't Provitalize require refrigeration?

The probiotics in Provitalize belong to a class called mesophiles, which mean they thrive well in temperatures ranging from room temperature to body temperatures. 

The live cultures you see elsewhere, which require refrigeration, are known as psychrophiles. This means they thrive best in cold temperatures.

This is why Provitalize doesn't require refrigeration and should be stored at room temperature.

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