We do not have refrigeration in our warehouse. None of the items we sell require this treatment. They do fine in most situations, except if they are left in a mail box in direct sun. Please ship your orders to addresses where you can avoid direct summer sun. There is an exception to this rule: E3 Live frozen algae is drop-shipped directly from manufacturing, with FedEx 2-day service, on dry ice, in a freezer box – 6 bottles at a time.