Bactericidal effect of propolis in vitro against agents causing upper respiratory tract infections.Arzneimittelforschung. 1993 Aug; 43(8):921-3.A
Propolis is a natural product of bees which exhibits an antimicrobial effect. In the study the existence of a bactericidal effect against several strains isolated from patients with infections in their upper respiratory tracts is demonstrated. In light of the use of propolis as a therapeutic agent in natural medicine for common colds and inflammatory processes this effect is discussed.