Our black hair serum contains mineral oil, Jojoba oil. It can replenish the hair with sufficient nutrients, repair the damage, and make the hair black and shiny. Its application is simple: gently shake the bottle and apply 1 drop of serum directly to the scalp along the roots of the hair, and apply to other gray areas as needed. Massage with your fingertips every morning or afternoon. Consistent use is key to getting the best results, and it works best on wet or towel-dry hair. Supplement hair follicle nutrition, nourish hair roots, white hair into black hair.