Comvita propolis extract pfl15 is easy to use water soluble and doesnt contain alcohol guaranteed pfl15 flavonoid rating easy to use dropper bees make propolis by gathering resin or sap from plants and combining it with enzymes packed withbio flavonoids they use propolis to protect their hives from infection comvita propolis extract pfl15 is easy to use water soluble and doesnt contain alcohol guaranteed pfl15 flavonoid rating easy to use dropper bees make propolis