There is no simple concept of brain tonic in Chinese medicine, but Chinese medicine believes that the brain is the sea of marrow, and the kidneys are responsible for the production of marrow (meaning that the kidneys control the production of marrow, which affects the growth and development of the bones), so tonifying the brain is necessary to tonify the kidneys. Therefore, nourishing Yin brain tonic herbs are yam, wolfberry, ripe rhizome and so on. 1. Yam: It has the function of nourishing the spleen, nourishing the stomach, generating fluids and benefiting the lungs, nourishing the kidney and astringing the essence. It is used for spleen deficiency with little food, prolonged diarrhea, lung deficiency with wheezing and coughing, kidney deficiency with spermatorrhea, dyspareunia, dysuria, deficiency heat and thirst, etc. It is not suitable for people with solid evil. Those who have solid evil should not be served. 2. Lycium barbarum: Functions for nourishing the kidneys, moistening the lungs, tonifying the liver, and brightening the eyes. Treatment of liver and kidney yin deficiency, lumbar and knee soreness and weakness (lumbar and knee soreness and weakness), dizziness, dizziness, eye fainting and tearfulness, deficiency cough, thirst, spermatorrhea. External evil solid heat, spleen deficiency with dampness and diarrhea should not be taken. 3. Radix Rehmanniae Praeparata: its function is to nourish yin and replenish blood. It is used for treating deficiency of yin and blood, impotence and weakness of waist and knees, cough and bone vapor, spermatorrhea, leakage of semen (excessive menstrual flow or dripping), irregular menstruation, thirst, urination, deafness, and fainting of eyes, etc. It is also used for treating deficiency of qi and phlegm, abdominal fullness, and diarrhea. It is also contraindicated for those with stagnation of qi and phlegm, and those with fullness of abdomen and loose stools (thin and unformed feces). The contraindications and adverse effects of the above drugs are not clear. If the patient is not feeling well, it is recommended to go to the hospital and standardize the use of the drug after identification by a Chinese medicine practitioner.