This is also on the website, concerning shipping temperatures:
Mutaflor site said...
Mutaflor should be stored refrigerated from 2 – 8 °C. A short interruption of refrigeration (under 72 hours) does not do any harm to the product. Mutaflor will be packaged with reusable cold packs during delivery to ensure efficacy when it arrives to you.
So, with two day shipping it should be fine.