In addition, the crude propolis produced by bee farm can't be eaten directly, because this kind of propolis is only the raw material of propolis products, and its components contain many ineffective substances and harmful substances such as impurities, chemicals and heavy metals from outside pollution. It must be purified and processed to remove impurities and harmful substances before it can be eaten by people, otherwise it may cause harm to human health. Of course, the pure propolis produced by people with strong professional knowledge by scientific gum extraction method is edible, but it is difficult for ordinary consumers to identify it.