In the content of dendrobine dendrobium iron skin is less than dendrobium gold hairpin, which is the reason why dendrobium goldpin is bitter and dendrobium iron skin is not bitter. The more bitter Dendrobium Chinense, it means the higher the dendrobium alkaloid content, and the higher its medicinal value. And the dendrobium gold sugar content is more, so the dendrobium is not bitter, gum more, sticky. That's why there is a saying that medicinal selection of gold hairpin, health care selection of iron skin. The difference between dendrobium hairpin and dendrobium iron skin is mainly the difference in the content of dendrobium alkali and polysaccharide content.