... the resin material collected by bees from flower buds or new leaves of the glue source plants, the maxillary glands and ... planet.FUENTANG propolis is collected from natural propolis and is rich in flavonoids, terpenes, quinones, esters, alcohols, aldehydes, ethers, organic alcohols ... , trace elements necessary for human body etc. It is nutrient-rich, activity, and low heavy metal content, so it is the ...