How should the probiotic be stored so that the bacteria do not die, and how can I tell whether the product is still active? — L. Plantarum Probiotic, 30 capsules - SWANSON

Storage conditions according to the product card: at a temperature of +5 to +25 °C, in a dry, dark place out of reach of children; the expiry date is stated on the packaging. The number of bacteria (10 billion CFU per capsule) is stated at the time of manufacture. Whether a refrigerator is needed and how long to store it after opening is not stated by the manufacturer: the permitted temperature range is +5 to +25 °C.

General recommendations (not a manufacturer's instruction): do not leave the pack in the heat — by the stove, on a windowsill, in a car in the sun — and do not keep it in the bathroom because of the humidity; close the pack after each use. The activity of the bacteria cannot be determined from the appearance of the capsule, so go by the expiry date and the storage conditions.