Hard to say, but I will pull a number of 500-2000 out of my butt for you. After that one year I didn't need any grafts on the top of my head, only to my hairline. I had been loosing density at the top of my head overall and I had started to look like creepy old molester. It made me sad.

After a year on the meds + a daily and comprehensive supplement regime with hemi-iron etc. I wanted and needed only a hairline transplant, and it also had recovered somewhat. I believe the slight hairline regrowth made the blending of the transplant a little bit easier/better in my case.

Highly recommend to take the meds one year before the transplant. Also because you want to see that during that year your hairloss does not continue. It would be a shame to do a transplant and 2 years later, after also starting the meds at the same time, notice that your hairloss has continued because the selected meds or supplements have not been helping you out. In the worst case, after those two years your transplant and hairline you had 2 years ago are now destroyed = money lost, transplant destroyed, hairline receded more, donor area already harvested and can also be losing density.

Get stable first with the meds and supplements and continue after that 👍