Lack of erectile hardness is a Yang deficiency, or it may be a Yin deficiency. It is common to see such patients in the clinic, showing symptoms such as soreness of the waist and knees, weakness of the legs, cold hands and feet, and even dry mouth and yellow urine. The deficiency of both yin and yang indicates that the patient’s kidney yin and kidney yang are both in a relatively low state and need to be supported and tonified in order to make the penis significantly harder. Another factor is age. After 40 years old, the function of the body will decline significantly, and the hardness of the penis will not be as good as that of young people, so you can take appropriate Chinese medicines, the more common ones being Liu Wei Di Huang Wan and Jin Kui Ren Qi Wan. Personally, I thought that I could increase the amount of herbs such as Cistanches, Cuscuta, and even deer antler under the guidance of a doctor to better improve the symptoms.