If you haven't heard about Propolis before, here's a quick introduction: Propolis is a sticky resin made by bees to protect their hives from invading pathogens. Inside the hive it helps maintain a sterile environment for the bees to work and for the queen to lay her eggs and raises the babies. Basically, propolis is how bees keep their hive and every bee inside it, safe from the threat of parasites, bacteria, fungal or viral outbreaks. Learn more about propolis here (it's fas