The main way to eat yellow essence is to take it in a decoction. Huangjing is the dried rhizome of Dian huangjing, Huangjing, and Multiflora huangjing of the lily family. The drug is sweet and flat in nature and belongs to the spleen, lung and kidney meridians. It has the effects of tonifying qi and nourishing yin, strengthening the spleen, moistening the lungs and benefiting the kidneys. It can be used in the treatment of spleen and stomach qi deficiency, body fatigue, gastric yin deficiency (insufficient yin fluid in the stomach), dry mouth and low food intake, lung deficiency and dry cough, coughing and hemoptysis with exertion, deficiency of essence and blood, lumbar and knee soreness and tenderness (a feeling of soreness and weakness of the lumbar and knee areas), and premature whitening of the beard and hair. Adverse reactions and contraindications of Huang Jing are not clear, but it should be noted that it is contraindicated for people with middle cold and diarrhea, plumpness (stomach distension and discomfort) and Qi stagnation. The drug is mainly taken as a decoction. If you need to use the drug, it is recommended to go to a regular hospital, under the guidance of a professional physician to identify the treatment.