In any case, because dry hair and gray hair can go hand in hand, a product that moisturizes hair from roots to ends is essential, colorist Kylie Williard Fritas previously told Allure. Many are created in order to address a concern (dandruff, breakage, brittleness) or to work most effectively for a specific hair type (4C curls, wavy hair, gray hair). For our review of the best gray hair treatments, we enlisted the help of multiple editors, writers, contributors, dermatologists, researchers, and hair colorists—who all have experience with treating gray hair.