So ive been looking to get more density and wanting to add bht to my donor area also. I reached out to a turkish company because this part should be lightwork.they said ok. And when i got the consultation call they said they cant do a bht because itll cause my old transplanted hair to fall out?? Ive never read or heard anything about this. Does anyone have any advice or input? I cant keep extracting from my donor area. Ill end up bald in reverse lol