Black beans have a tonic effect on the kidneys. Black bean is a traditional Chinese medicine that enters the spleen and kidney meridians to tonify the kidney, benefit the essence and brighten the eyes (tonifying the essence and promoting the recovery of eyesight). Black beans are sweet in taste and flat in nature; they belong to the spleen and kidney meridians and have the effect of benefiting the essence and brightening the eyes, nourishing the blood and dispelling the wind, inducing diuresis and detoxifying the toxins. They are mainly used for the treatment of deficiency of yin and thirst, dizziness and faintness of the eyes, excessive sweating of the body, kidney deficiency and lumbar pain, oedema and urination, paralysis and pain and constriction of contracture, numbness of the hands and feet, and poisoning of medicine and food. Black beans are used for kidney deficiency and yin deficiency and thirst, blood deficiency, dizziness and dizziness, yin deficiency and sweating, as well as kidney deficiency and lumbago, edema and urination, etc. They are often used with smallpox pollen. Black beans can detoxify food and drugs, and are often combined with mung beans, white lentils, and bezoar and other herbs. Adverse effects of the drug are not clear. If there are related symptoms, it is recommended to seek medical advice in time, do not self-medicate.