Qi Zi San is a Chinese herbal formula that warms the kidneys and benefits the qi, and is recommended to be taken as directed by a doctor. Qi Zi San is the name of a traditional Chinese medicine formula derived from Biquan Qian Jin Yao Fang (备急千金要方), Volume 2. It is composed of Schisandra chinensis, Plantago ovata, Semen cuscutae, Dendrobium officinale, Dried Radix Rehmanniae Praeparata, Cornu Cervi Pantotrichum, Radix et Rhizoma Ginseng and Poria. The efficacy of Qi Zi San is to warm the kidneys and benefit the vital energy, which is effective in treating impotence and premature ejaculation in men, as well as lumbar and knee soreness (the feeling of soreness and weakness of the waist and knees) and physical weakness caused by kidney deficiency. During the period of taking the product, diet should be light, avoiding smoking, alcohol and spicy, cold and greasy food. If the patient has any discomfort, please go to a regular medical institution for consultation; if you need to use Qi Zi San, you must use the medicine under the guidance of a professional doctor.