Don’t be concerned about the temperature upon arrival. Room temperature is not harmful to the AOBs in your bottle unless it is for extended periods of time (the 4 weeks on the label). It's really the temperature extremes that are harmful. This is why we ship expedited so that all packages arrive between 1-3 days from leaving our facility, depending on where in the US or Canada you live. We also use insulated mailers to further protect the AO+ Mist from getting too hot or cold (depending on the season), so it's not likely that anything inside the package ever reached dangerously high temperatures.