Yes, you can apply Micellar water to the hair. One of the best ways to keep your hair healthy is by applying Micellar water often. In fact, you can use Micellar water in place of a shampoo, only that your hair might not be as soft or look shiny as it would have if you were to use a shampoo. Micellar water can be used to purify hair scalp without stripping your hair of its natural oil. Also, it can help to counterbalance the heavy metals and minerals contained in tap water. Lastly, Micellar water can also help you deep clean your skin which will encourage your hair to grow faster.