40-year-old long gray hair is a normal phenomenon, conditioning may have some effect, but it is difficult to completely reverse. Epidemiology shows that in normal aging, Asians begin to gray hair at the age of (37.5 ± 2.5) years old, so 40 years of age gray hair is a relatively normal phenomenon, and does not belong to the category of gray hair. Chinese medicine believes that the liver and kidney loss, lack of source of essence and blood, qi and blood or deficiency or stagnation can not be moistened, blood heat bias within the frying of yin and blood for the pathogenesis of gray hair, so the common clinical Chinese medicine prescription has seven treasure beard Dan, ten full of Dachan Pill, the grass is also Dan, six flavors of the Huang Huang Pill, ginseng nourishes the glory of the soup, the return to the spleen soup, the Yueju Pill, the essence of the Dan, and so on. Commonly used medicines in clinical treatment of gray hair are He Shou Wu, Angelica sinensis, Radix Rehmanniae Praeparata, Radix Rehmanniae Praeparata, Radix et Rhizoma Dioscoreae, Black Sesame Seeds, Fructus Lycii, Radix Achyranthis Bidentatae, Cuscuta Millefolium, Radix et Rhizoma Ligustici, Poria, Radix Paeoniae Alba, Rhizoma Ligustici Chuanxiong, Fructus Mulberry, Radix Glycyrrhizae Praeparatae, and so on. If you need to improve gray hair, you should seek medical advice and choose medication under the guidance of a doctor, rather than self-medication.