In general, there is no direct relationship between having a lot of gray hair and a lack of folic acid. Possible causes of gray hair include age, heredity, mental reasons, lack of nutrients and insufficient rest time. 1. Age: As we grow older, the melanocyte-producing cells in our bodies will gradually age and the phenomenon of gray hair will occur, which is a normal physiological phenomenon. 2. Heredity: Some people may have early gray hair due to hereditary reasons, commonly known as whiteheads. 3. Mental reasons: mental tension, anxiety, depression, etc., can also cause more gray hair. 4. Lack of nutrients: Minerals such as calcium, iron, zinc and vitamin A and vitamin D can also cause more gray hair. 5. Insufficient rest time: staying up late for a long time can lead to insufficient sleep time, which also has a certain correlation with more gray hair. Folic acid belongs to water-soluble vitamins, the lack of folic acid, will occur megaloblastic anemia, the face, trunk, limbs stretch side and other parts of the scaly pimples or plaques and other symptoms; the lack of folic acid and gray hair in general does not have a direct relationship. Apparent gray hair, need to actively consult the doctor, follow the doctor’s advice reasonable treatment.