Propolis consists mainly of resin and is a natural material collected by bees from the leaves, buds and bark of trees (mainly the poplar). The word "Propolis" comes from the Greek and means Pro = for and Polis = city, which translates as protection for the city or protector of the city. With this extraordinary substance, the bees close all cracks in the hive or closet.With this extraordinary substance, the bees close all cracks in the hive or closet. In this way the propolis protects the "city" of the bee colony against external dangers as well as against the spread of infections within.