after Dendrobium candidum is processed, the dry product is called Dendrobium candidum. Dendrobium candidum belongs to Orchidaceae, which takes root by air, has strict requirements on growth conditions, and its survival quantity is extremely rare under natural conditions. In 1984, Dendrobium candidum was listed in the List of Rare and Endangered Protected Plants in China.

Shennong's Classic of Materia Medica records Dendrobium candidum: "Treating the middle injury, removing arthralgia, lowering qi, tonifying the five internal organs, wasting away, strengthening yin, and thickening the stomach for a long time." Compendium of Materia Medica claims that it has the effects of "strengthening yin and nourishing essence, enriching the stomach and intestines, nourishing the internal organs, and prolonging life". In the folk, it has the reputation of "life-saving fairy grass".