Wu Hair Pill has the ability to nourish Yin and strengthen the brain, cool the blood and darken the hair, and is used for teenage gray hair disorder. How long will you take to turn your gray hair black is related to your age, your physical condition, and your nutritional status, and should be analyzed according to your personal situation. The amount of melanin in the hair can affect the color of the hair, more melanin hair will be black, less melanin will be prone to gray hair. The main ingredient of Wu Hair Pill is He Shou Wu, which has the effect of waxing hair and is mostly used for teenage gray hair. In general, teenage gray hair is mostly caused by congenital genetic factors, followed by worries, insomnia and other factors, the lack of certain nutrients or deficiencies can also produce teenage gray hair. Usually, the symptoms will be reduced after about 1 week of taking Ubiquinol. In older people, the melanocytes in the hair follicle area cannot be transformed into melanin and gray hair appears, in this case the transformation into black hair is more difficult and the patient may not be effective even after taking several courses of treatment. Patients with gray hair are advised to improve their living habits, regular work and rest, and maintain a good state of mind; pay attention to dietary diversification to ensure adequate nutrition, you can eat more black sesame, fungus, black bean powder, etc., which can help in the treatment of gray hair. In addition, patients also need to note that because He Shou Wu has hepatotoxicity, it is not recommended to take it for a long time.