A woman’s forehead gray hair may be the lack of nutritional elements, such as B vitamins, certain trace elements, etc.; may also be physiological factors, such as aging, slow metabolism, etc.. 1. Physiological factors: with age, the body’s metabolism will slow down, then the formation of melanin will slow down, so there will be forehead gray hair. 2. Nutritional elements: If women lose weight for a long time, or gastrointestinal dysfunction, then the nutritional imbalance will occur, the lack of certain nutrients, will also appear forehead gray hair. Women usually have to develop good eating habits, do not favor picky food, do not excessive weight loss, pay attention to balanced nutrition.