e200921c_sity_of_Michigan_Health_System__Why
[Supplement] 2 Stars Garlic Follow label instructions to take a product containing stabilized allicin [Why] 
In one study, taking garlic during the winter months reduced the occurrence and duration of colds. In a double-blind trial, participants took one capsule per day of a placebo or a garlic supplement that contained stabilized allicin (the amount of garlic per capsule was not specified) for 12 weeks between November and February. During that time, the garlic group had 63% fewer colds and 70% fewer days ill than did the placebo group.25 In another double-blind study of healthy volunteers, supplementing with 2.6 grams per day of an aged-garlic extract for 90 days decreased by 58% the number of days on which severe cold or influenza symptoms occurred.26
Common Cold/Sore Throat (Holistic) | University of Michigan Health System
Why