Kidney yang deficiency is not recommended to take yellow essence in water alone, it should be used together with other medicines that tonify kidney yang. Yellow essence has the effect of nourishing yin and moistening lungs (by replenishing the fluid in the lungs to moisturize the lungs), and benefiting the kidneys, etc., and it should be used in accordance with the doctor’s prescription. Kidney yang deficiency is a condition caused by insufficient yang energy in the kidneys, which manifests itself in symptoms such as lumbar and knee soreness (a feeling of soreness and weakness in the lumbar and knee regions) and coldness, impotence, premature ejaculation, prolonged ejaculation, infertility with uterine coldness, coldness, lack of warmth in the limbs, and nocturnal polyuria. Treatment should be based on the principle of warming and tonifying kidney yang (warming and replenishing kidney yang). Huang Jing is effective in tonifying Qi and nourishing Yin, moisturizing the lungs, strengthening the spleen and benefiting the kidneys. It is used for lung deficiency and dry cough, deficiency of stomach yin (insufficient yin fluid in the stomach), deficiency of spleen and stomach qi, deficiency of essence and blood, premature whitening of beard and hair, lumbar and knee soreness and weakness, and internal heat and thirst (internal heat accompanied by symptoms of overeating, excessive drinking, and excessive urination). It should be used with caution in cases of spleen deficiency and dampness, and phlegm-dampness congestion. Huang jing favors yin tonic, and is not recommended to be used alone for kidney yang deficiency; it should be combined with herbs that warm and tonify kidney yang (warming and replenishing the yang energy of the kidneys), and it is difficult to achieve the therapeutic effect of drinking it in water. When there is kidney yang deficiency, you should be guided by a doctor under the guidance of diagnosis, and should not use medicines blindly, so as not to delay the condition.