accidental freezing

Hi- Does anyone have any thoughts on collodial silver being frozen? During the winter we ordered several bottles from puritans pride- and the box was left outside for a couple of hours during sub zero weather, and they froze.
I contacted the company and they assuredme it wouldn't effect the potency. (3ppm- in a plastic bottle)
Does anyone know if this is a problem? I'm using the last of the supply now- and I just dont feel that it's working like it should.
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