Nutritional efficacy of dendrobium, orchids. One of the dendrobium, Li Shizhen in the "Compendium of Materia Medica" evaluation of dendrobium "strong yin and essence, thick stomach and intestines, make up for the lack of the internal absolute, flat stomach qi, long muscles, puzzle in addition to shock, light body and prolonged life"; folk called it "life-saving magic grass". Nourish the Yin and Tsu to strengthen the body to tonify the spleen and stomach to protect the liver and gallbladder to clear the deficiency heat: deficiency heat, manifested as body fatigue, dizziness, flushing, palpitations, panic, cough with little phlegm, insomnia and forgetfulness, yellow and red urine, red tongue, fine pulse and a group of symptoms.