Follicular Unit
A follicular unit is the natural cluster in which scalp hair grows, containing one to four hairs with their own glands, muscle and blood supply. It is the thing a transplant moves.
Where you'll meet it
Everywhere, usually as the word graft. A quote for 2,500 grafts means 2,500 follicular units, which is typically somewhere between 5,000 and 6,000 actual hairs.
Why the distinction matters
Clinics quote grafts. Some advertise hair counts instead, which produces a bigger number for the same operation. If one quote says 2,500 and another says 5,500, check which unit each is using before concluding anything about price.
How they are used
Units are sorted by hair count after extraction. Single-hair units go at the front edge of a hairline, where anything larger looks artificial. Two, three and four-hair units go behind them to build density.
That sorting is done by technicians under magnification, and doing it well is a real skill. It is also where transection shows up, since a damaged unit is still counted and simply does not grow.
Related pages
Thinking about a transplant?
The Start Here guide explains why medical treatment comes first, how much donor hair you actually have, and what a transplant can and cannot move.
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