Ultra Mega Strength Super Premium Quality Full Potency & Purity Dietary SupplementPropolis is a resinous substance gathered by the bees from certain select trees and used to line the hive to keep the hive sterile and bee colony healthy. Bee propolis is one of nature's richest sources of bioflavonoids.Y.S. Beekeepers of generations have been dedicated to research and develop the highest quality bee products.