Propolis is a highly useful substance that bees make from resinous materials they collect from trees. In addition to resins, it contains pollen and enzymes. Bees use propolis to seal gaps and as a disinfectant. Beekeepers can use it for salves and other medicinal purposes. It is also used to coat the inside of beehives. Want to learn more? Read more at: http://www.imkerpedia.nl/wiki/index.php/propolis