I keep all mine in fridge, however Matt did state that it's ok if you don't.
[quote name="ax1" post=5833331]Im thinking of getting a six pack of Gut Health. I dunno too much about these products but have noticed pro-biotics on the shelf and in the fridge in the store. Should gut health be refrigerated? And can potentially hot summer shipping effect quality of the product?[/QUOTE]
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The strains I use in Gut Health are extremely hearty and can take some environmental exposure without much compromise. They are kept in a cool warehouse here, and once they arrive you should try and keep them in a cool dark place, but room temperature is fine. If you feel more comfortable refrigerating 4 or 5 bottles it certainly wouldn't hurt.