Health Dendrobium, Orchidaceae. Among them, Dendrobium candidum and Li Shizhen evaluated Dendrobium candidum in Compendium of Materia Medica as "nourishing yin and replenishing essence, thickening the stomach, nourishing the five internal organs, calming stomach qi, growing muscles, improving intelligence and relieving spasm, strengthening the body and prolonging life"; Folk call it "life-saving fairy grass" for nourishing yin and promoting fluid production, strengthening the body, strengthening the spleen and regulating the stomach, protecting the liver and gallbladder, and clearing away heat and deficiency: deficiency and heat are manifested as fatigue, dizziness, flushing, palpitation, cough with little phlegm, insomnia, forgetfulness, Huang Chi in urine, red tongue, thready pulse, etc.