It is useless to take folic acid for gray hair. Gray hair may be related to physiological factors such as aging, heredity and mental stress, or it may be caused by pathological factors. Folic acid is a B vitamin that can be used to treat megaloblastic anemia caused by folic acid deficiency, and women who are preparing for and during early pregnancy can also take folic acid to prevent their babies from developing neurological malformations. 1. Physiological factors caused by gray hair: usually to develop a regular work and rest habits, try not to stay up all night, relax, avoid excessive fatigue. 2. Pathological factors caused by the white hair: to identify the original disease, active treatment. For example, vitiligo caused by white hair, to actively treat the original disease, laser treatment is a method. There are a lot of other reasons why hair is white, it is recommended that if you exclude physiological factors, it is recommended that you consult a doctor in a timely manner, improve the examination, and comply with the doctor’s instructions for treatment.