Propolis is the tree resin that bees use to coat their hives. The word literally means for the health of the city and indeed it does keep the beehive clean and protected from bacteria and viruses. It is a very strong antimicrobial. It can be used topically on cuts and wounds. It is indicated for bronchitis, pneumonia, and other respiratory infections. Take 30 drops in water or juice, 1 3 times daily, or as directed by a healthcare professional.