Does hair extracted for hair transplantation grow back?

I practice the Neograft FUE hair restoration procedure,
where I move the hair from a healthy donor site, (usually the back of the
head/neck), and transplant the healthy hair follicle onto the balding area.
Once the follicle is removed from the donor area, it will not regrow, but the
percentage taken is usually minimal and not noticeable. There is little to no
scarring, as the device we use to extract
the follicle is less than 1 mm diameter. The tiny hole doesn’t need suturing.
The grafts are placed into a needle stick and are held in place without
sutures. The delicate grafts are handled by the machine and inserted
pneumatically so that they are less likely to be injured (which means a higher
amount of ‘take’ or success). Typically, people don’t develop scarring from
needle sticks so no one can even tell you had it done. Some patients even
return to work the next day.

Does hair removal for transplantation grow back? NO!  That is why you need to make sure you will have enough hair to complete a transplantation before you start.      

Extracted/ harvested hairs do NOT grow back. You WILL have a scar (with no hair) no matter which technique is used.  FUE scars will leave thousands of white dots and FUT scars will leave a linear line.  This is not meant to sound fatalistic, but that is the reality of ANY surgical procedure.  There are many techniques used by surgeons to minimize the appearance of a scar but there will still be a scar.  Fortunately most scars are small enough for hairs to cover them.