e200921c_sity_of_Michigan_Health_System__Why
[Supplement] 2 Stars Probiotics Refer to label instructions [Why] 
A double-blind trial showed that daily supplementation with with a probiotic may decrease the incidence of upper respiratory tract infections in children. In a double-blind trial, daily supplementation with Lactobacillus GG (a probiotic organism) for 3 months decreased the incidence of upper respiratory tract infections by 34% in children attending daycare centers.28 Another double-blind trial found that a probiotic preparation taken for 3 months during the winter decreased the incidence of common infectious diseases in children aged 3-7 years.29 The product used in that study contained Lactobacillus helveticus R0052, Bifidobacterium infantis R0033, Bifidobacterium bifidum R0071, and fructo-oligosaccharides.
Common Cold/Sore Throat (Holistic) | University of Michigan Health System
Why