e200921c_sity_of_Michigan_Health_System__Why
[Supplement] 1 Star Sage Refer to label instructions [Why] 
Sage tea may be gargled to soothe a sore throat. Red raspberry , blackberry, and blueberry leaves contain astringent tannins that are helpful for soothing sore throats.67 Sage tea may be gargled to soothe a sore throat. All of these remedies are used traditionally, but they are currently not supported by modern research.
Common Cold/Sore Throat (Holistic) | University of Michigan Health System
Why