This is a gray hair cover color treatment product that solves both gray hair coverage and treatment at once. It covers gray hair naturally without simply using a dye, and the protein component nourishes the hair. It attaches to gray hair and changes gray hair to black as anthocyanin reacts to oxygen. Unlike regular gray hair dyes, it minimizes damage to the scalp and hair. Therefore, when using Black 4U, it keeps the hair healthy and shiny. It has been minimized to minimize ingredients that can irritate the scalp, making it suitable for sensitive scalp, and has been tested for skin irritation. It can easily cover gray hair, saving time and money. It adds shine to the hair and gives it volume, allowing you to create a more beautiful hairstyle. It is recommended for those who are concerned about gray hair and those who want to maintain healthy and beautiful hair. Regular use can prevent gray hair and keep your hair healthy.