I have gray hair and I’m young

Patient: HiI’m khulud, I’m 24 years old and I have gray hair I’m usually change my hair color. I found medicine Capsule the name of the Product is (Melancor), This medicine is good to use it. because my hair is damaged and dry cause the Chemicals, and this medicine I read about it. It help to change my gray hair to normal. please help me.