Propolis or bee glue is a resinous mixture that bees produce by mixing the saliva secreted by its glands with beeswax and other substances collected from tree buds, water flows, and other botanical sources with such dark brown color.

Propolis smoothen the inner surface of the cell and to maintain the internal temperature (35 ° C). It also forms a strong cell wall that contributes to maintaining a sterile internal environment because it contains antiseptic, anti-inflammatory, anti-oxidant, anti-bacterial and anti-fungal properties.