Bee propolis is highly variable depending what fodder's available, time of year, coolness, wetness, distance from a highway, whether or not you caulked the windows last wednesday, etc. So unless you're the beekeeper and you KNOW everything's copacetic, it may contain a huge variety of substances. It's almost certain to be antifungal, topically, and is supposed to support the immune system, but it's just so variable....very hard to pin down. If you have severe allergic reactions to anything natural, you may want to avoid it.