Hair Growing Slowly 19 Years After Chemical Burn

19yrs ago, my hair was burnt w/relaxer on the scalp and then combed out removing my hair. the forehead and top of my head were most effected. Though i’m 37, the hair has slowly been growing back. so im wondering if there’s a hair regrowth product for someone who lost their hair through mal-treatment instead of balding

This is a very difficult question that I can not provide a straightforward answer to without examining you. Based upon a 19 year history since the initial injury, it is highly probable that the hair will not be significantly better over time, nor are there any treatments I can think of that might work after that much time.