So What Is Bee Propolis?
Propolis is a sticky resin that seeps from the buds and bark of trees, Bees gather the propolis, carry it to the hive, and with waxy flakes secreted from their abdomens, they blend it into "bee propolis" which they use for many purposes. For instance, worker bees line the little cells in which the queen bee lays her eggs, and due to its antiseptic properties, the propolis lining insures a hospital-clean environment for rearing her brood. It does the same for your wounds...
Bees use propolis to seal and sanitize their hives in other ways. When an invader gets into the hive, the bees kill it and if the body can’t be removed, they encase it in propolis to prevent decay and the development of harmful bacteria, viruses, mold, and other yucky stuff common to corpses. See Egyptian entombing below.