Kidney deficiency is divided into kidney yin deficiency and kidney yang deficiency. The symptoms of kidney yin deficiency are five vexations and fever, dry mouth and tongue, poor sleep, red tongue, less coating on the tongue, and rapid pulse. Liuwei Dihuang Pill is the main product aimed at the symptoms of kidney yin deficiency at present. The symptoms of kidney-yang deficiency are cold limbs, fear of cold, pallor, impotence, premature ejaculation, listlessness, pale tongue, thin tongue coating and slow pulse. You can take Jinkui Shenqi Pill and Wuzi Yanzong Pill. Guidance: Chinese yam, sesame, dog meat, medlar, sea cucumber, mutton, Cordyceps sinensis, animal meat, eggs, bone marrow, black sesame, cherry, mulberry and leek seeds all have kidney-tonifying effects.