Broncolin Honey Syrup, 11.4 oz, is a dietary supplement made with honey, propolis, and natural plant extracts. Propolis is a resinous substance that bees produce from materials collect from tree buds. Rich in flavonoids, a class of antioxidants, propolis has a long history of use as a natural treatment to improve your health. As a natural anti-inflammatory agent, Propolis is the best option. Created by bees to protect hives against microbes and bacteria, propolis is a unique substance that enhances immune function and offers antioxidant activity. Antioxidant and Anti-inflammatory, Healthy and Effective.