The manufacturer,UAS Labs, has sent us the following advice regarding the heat stability of their probiotic products.
"UAS Laboratories manufactures the DDS Plus and Probioplus at about twice the guaranteed potency to factor in the following: shipping, storage, shelf life, heat and time out of refrigeration. The DDS Plus Acidophilus and Probioplus are packaged in glass bottles that are nitrogen flushed to ensure a more stable environment. This process allows the Probiotics to be heat stable up to 120 degrees Fahrenheit for a period of time (up to seven days). The DDS Plus and Probioplus are shelf stable for more than six months at room temperature and 2 years under refrigeration."
Whole Approach ships products with ice packs in summer to be extra sure that the bottle reaches the customer in excellent condition.