What temperature should I keep my Omega 3 on?

I left my Omega 3 supplements in my car overnight and the temperature was -17 degrees celcius....is it still safe to take them? I looked on the bottle it doesn't specify the storage temperature.|||omega 3s are ok cold they cannot tolerate much heat or light or they go rancid otherwise they are ok|||i always kee mine in the refrigerator.....warm is when things start growing on food. refrigerator should be kept at 39 degrees and no leftovers after 2 or three days