In fact, whitening or dull hair can be caused mainly by hormones , lack of vitamin E. However, the most effective way to treat gray hair is: Amalki , Amalki contains Vitamin C and antioxidants. Putting mango in the food can stop the hair from ripening. Moreover, leaving amalki paste on the head for 15 to 20 minutes and washing it with water is beneficial. You can use sleeping oil or coconut oil on the scalp , it will reduce the thinning of your hair.