Alflorex Immune 3 FOR 2 (30 X 3). 3 for 2 Deal. For Immune Support with Extra Strength Vitamin D.. Alflorex Immune Probiotic contains the PrecisionBiotics PB-VIR™culture. This unique culture has been specially formulated with extra strength vitamin D to support the normal function of the immune system.. The Alflorex Immune Probiotic is the only food supplement to contain the unique PrecisionBiotics PB-VIR™ culture.. Alflorex side effects: no known side effects. However vitamin D supplements cannot be taken by people with certain underlying health conditions, please consult you doctor if unsure. The PB-VIR™ culture is a naturally occurring and safe bacterial strain, belonging to the Bifdobacterium longum species; these are types of bacteria given by mother to baby at birth.