Written by the AfroHairClinicTurkey editorial team, drawing on the clinical experience of our medical team · Last updated September 21, 2026 · How we write and check this
On this page 6 sections
- What the donor zone is, and the asterisk on “permanent”
- The supply is smaller than the industry tends to imply
- What overdrawing the budget actually looks like
- Denser, finer, or neither: what has actually been measured
- What is documented for Afro-textured hair, and what is not
- Frequently asked questions
Your donor is a budget, not a fountain
A transplant moves hair from the back and sides to a thinning area — it does not grow new hair, and you only get one donor for life. Change the supply, the area, and the number of sessions, and watch the trade-off. This is a general model — it measures nothing about your own head, and it gives no graft number.
Only a safe share is taken; the donor keeps its reserve.
Why there is no graft number here. How much you can move depends on your own donor density, scalp laxity, loss pattern and how far your loss may still go — none of it knowable from a photo or a slider. That is measured in person, with the scalp under magnification. Any tool that hands you a graft count before anyone has looked at your head is guessing.
There is a number worth having, though, and it is not about you: a graft count is an area multiplied by a density. The graft module works that sum for any patch you draw — which is how you can judge a figure someone quotes you, without anyone pretending the figure came from your scalp.
How donor capacity actually works — read the methodology →What this tool does not do
It teaches the trade-off. It does not:
- measure your donor density or capacity
- tell you how many grafts you would need
- promise any coverage or result
- decide whether you are a candidate
- replace an in-person exam with a densitometer
What the donor zone is, and the asterisk on “permanent”
The band of hair at the back and sides of the head is used as the donor because hair growing there tends to resist the process that thins the top. That tendency is not a detail of the operation. It is the entire reason the operation works: hair moved from that band is expected to go on behaving the way it did before it was moved.
“Tends to” is doing real work in that sentence. The resistance is relative rather than absolute, and it does not come with a guarantee attached. Where loss is still advancing, the boundary of what can safely be taken moves with it — which is why a donor assessed at twenty-five is not the same donor at forty. The methodology page sets out where that boundary comes from, and where the published figures disagree with each other.
The supply is smaller than the industry tends to imply
There is a claim in wide circulation that textured hair arrives in denser groupings and therefore has more to give. hair density in people of African descent has been measured five times: by scalp biopsy in 22 African Americans against 12 white patients, by phototrichogram in 38 African-born adults, in 2,249 adults from 24 ethnic groups, and by trichoscopy in 122 South Africans and in 909 Nigerians. Four of the five found it lower than white or worldwide comparisons; the Nigerian study reported a median of 330 hairs per square centimetre and called it high, and its counting rule could not be verified. None measured a , and none measured what curl adds to how much scalp each hair covers.[1,2,3,4,5,6]
That matters here more than anywhere else on this site, because every figure downstream of it — how much can come out, how much can be covered, how many sessions are realistic — is calculated from an assumed starting supply. Begin with a number that flatters and everything after it is wrong in the same direction.
What overdrawing the budget actually looks like
The hair left behind in the donor still has a job to do: it has to cover the donor. This is the constraint people underestimate, and the reason is ordinary. A recipient area can be judged in a mirror. The back of your own head is judged by other people.
An over-harvested donor reads as see-through rather than bald — thin under bright light, obvious when the hair is worn short, and it does not recover. Extraction also leaves marks of its own regardless of how carefully it is done: is not scarless. Each punch takes the follicular melanocytes out with the graft, and the wound can heal as a small pale dot — reported as more visible in darker skin phototypes and with short hairstyles. The review that documents this grades it common but gives no incidence figure.[7,8] What those marks are in darker skin, how differ from them, and the one question that decides the donor plan are on keloids, dark skin and a hair transplant.
Which is also why a clinic’s photographs are worth reading for what they leave out. A gallery cropped to the top of the head is showing you the half of the result that improved.
When the arithmetic says the budget is not big enough, the next offer is usually the beard, then the chest. That is a real operation with a real, and very small, literature behind it — one study has compared beard, scalp and chest grafts in the same head. What it found, and the beard condition nobody has studied harvesting, are on beard and body hair as a donor.
Denser, finer, or neither: what has actually been measured
Clinic pages say both. Some say is denser, so there is more to take; others say it is finer, so each graft covers less. Both sentences are usually printed without a source. Here is what has been measured, with the sources.
| Study | How it counted | Who | What it found |
|---|---|---|---|
| Sperling 1999 | Follicles in 4 mm scalp biopsies | 22 African American and 12 white patients, USA | Lower in the African American group |
| Loussouarn 2001 | Phototrichogram, three scalp areas | 38 adults born in central and western Africa | 190 against 227 hairs per cm² in earlier white volunteers; range 90 to 290 |
| Loussouarn 2016 | Non-invasive validated techniques, three areas | 2,249 adults, 24 ethnic groups | African hair lower in density, slower growing; Asian thicker; white highest density |
| Anaba 2024 | Phototrichoscopy, four sites | 909 Nigerians aged 5 to 45 | Median 330 per cm², range 113 to 660; called high |
| Dlova 2025 | Videodermoscope at 50×, five images | 122 South Africans, mean age 21 | 139 per cm²; shaft 62.6 µm; called lower |
Hair density in people of African descent has been measured five times: by scalp biopsy in 22 African Americans against 12 white patients, by phototrichogram in 38 African-born adults, in 2,249 adults from 24 ethnic groups, and by trichoscopy in 122 South Africans and in 909 Nigerians. Four of the five found it lower than white or worldwide comparisons; the Nigerian study reported a median of 330 hairs per square centimetre and called it high, and its counting rule could not be verified. None measured a donor area, and none measured what curl adds to how much scalp each hair covers[1,2,3,4,5,6]
So the “denser” claim has one large study on its side and four against it, and the one on its side counts in a way we could not check. Read the two South African and Nigerian numbers together: 139 and 330 per square centimetre, both by trichoscopy, both from young Africans, a year apart. A gap that size between two instruments is a fact about instruments, and it is why a clinic quoting you “the density of Afro hair” as one number has picked a number.
Finer, then?
In the 122 South Africans of the trichoscopy reference study, mean hair shaft thickness was 62.59 micrometres, with the frontal scalp showing the thickest shafts and the highest follicular unit density, the temporal scalp the largest share of thin hairs, and the occipital scalp the highest proportion of three-hair follicular units[5] In 2,249 young adults without alopecia from 24 ethnic groups on five continents, measured with non-invasive validated techniques on three scalp areas, African hair had lower density and a slower growth rate, Asian hair a thicker diameter with faster growth, and white hair a high total density[3]
Whether 62.6 micrometres is “fine” depends on what it is compared with, and the South African study did not measure a comparison group. The fibre itself has been compared: laboratory measurements of hair fibres from white, Asian and African subjects, using X-ray analysis, cross-sectional measurement, tensile testing and water swelling, found no differences in the internal structure of the fibre between the three groups, while geometry, mechanical properties and water swelling differed according to ethnic origin[9]. A coiled fibre is elliptical in cross-section rather than round, which is one reason a diameter reading is a less complete description of it than of a straight hair.
Why it looks fuller than it counts
In more than 2,000 hairs from 12 African volunteers who had not used chemical treatments, light microscopy showed hairs that appear as a tightly coiled spring-like structure, knots in 10 to 16 percent of shafts against 0.15 percent in other groups, shafts that appear broken, features consistent with repeated breakage on electron microscopy, and, examined in place on the scalp, interlocking of the hair shafts[10]
That interlocking is the closest thing in the literature to an explanation for the “denser” impression: shafts that coil and catch on each other cover skin between them in a way straight shafts do not. It is an observation, not a coverage figure. Nobody has measured how much scalp one coiled follicle covers compared with one straight follicle — we looked for that specifically, and the search is on record — and that is the quantity a graft estimate for your hair would actually need. Our own earlier sentence that coiled hair therefore needs fewer grafts was removed for exactly that reason; the removal is in the evidence decision log, and so is the narrowing of what this page used to say about density.
What this means for a donor estimate, in our practice: we do not take a density figure from the literature for your hair, because the literature does not have one. We count in your donor area, under magnification, in a marked square, and we say what we counted. The published figures above are context for that number, not a substitute for it.
What is documented for Afro-textured hair, and what is not
The published limits on how much of a donor can safely be taken were not established on Afro-textured scalps. They are the best figures available, and they are cited in full on the methodology page, but they come from work that did not set out to answer this question for this hair. Presented to you as settled for your scalp, they are being stretched further than the record allows.
That gap is why the model above refuses to produce a graft number, and why it will go on refusing. A slider does not know your , your scalp laxity, your pattern of loss, or how much further that loss intends to travel.
Frequently asked questions
Does donor hair grow back after it has been taken?
No. A follicle removed from the donor is relocated rather than duplicated, and nothing grows in its place. That single fact is what makes a donor a budget rather than a renewable supply.
Is Afro-textured hair denser, so is there more of it to take?
Not by any measurement we can stand behind. Five published studies have counted it; four found it lower than white or worldwide comparisons and one large Nigerian study found it high, with a counting method we could not verify. None of them counted a donor area. What coiled hair does add is interlocking between shafts, which makes it look fuller than it counts; how much scalp one coiled follicle covers has never been measured.
How many grafts can safely be taken from my donor?
Nobody can answer that from a photograph, a slider or a form, and that includes this page. It depends on your donor density, your scalp, your pattern of loss and how far that loss may still travel — all of which are assessed in person, with the scalp under magnification.
What does an over-harvested donor look like?
Thinning at the back and sides that shows under bright light and when the hair is cut short. It does not grow back, which is why the limit matters more than the does.
Why does this tool not give me a number?
Because a number produced without examining your scalp is a guess wearing the costume of a measurement. A clinic that hands you one before anyone has looked at your head is doing the same thing.
Clinical references
- Sperling LC. Hair density in African Americans. Archives of dermatology. 1999;135(6):656-8. view source →
- Loussouarn G. African hair growth parameters. Br J Dermatol. 2001;145(2):294-297. view source →
- Loussouarn G, Lozano I, Panhard S, Collaudin C, El Rawadi C, Genain G. Diversity in human hair growth, diameter, colour and shape. European Journal of Dermatology. 2016. doi:10.1684/ejd.2015.2726 view source →
- Anaba EL, Sani H, Magaji D, et al. Trichoscopic Evaluation of Normative Values of Scalp Hair Density in an African Population from Nigeria: A Cross-Sectional Study. West Afr J Med. 2024;41(11):1105-1112. view source →
- Dlova NC, Enechukwu NA, Suleman MH, Maseko JZ, Rudnicka L. Baseline trichoscopic values for afro-textured hair in indigenous South Africans. International Journal of Dermatology. 2025. doi:10.1111/ijd.17633 view source →
- AHC Afro Hair Clinic. Literature search record: measured hair density, shaft diameter and coverage per follicle in patients of African descent or with Afro-textured hair. PubMed, run 20 September 2026.
- Romera de Blas C, Vega Díez D, Ricart Vayá JM, Gómez Zubiaur A. Complications in follicular unit excision hair transplantation. Frontiers in Medicine. 2026. doi:10.3389/fmed.2026.1750989 view source →
- Adotama P, Papac N, Alexis A, Wysong A, Collins L. Common dermatologic procedures and the complications unique to skin of color. Dermatologic Surgery. 2021. doi:10.1097/DSS.0000000000002813 view source →
- Franbourg A, Hallegot P, Baltenneck F, Toutain C, Leroy F. Current research on ethnic hair. J Am Acad Dermatol. 2003;48(6 Suppl):S115-S119. view source →
- Khumalo NP, Doe PT, Dawber RP, Ferguson DJ. What is normal black African hair? A light and scanning electron-microscopic study. J Am Acad Dermatol. 2000;43(5 Pt 1):814-820. view source →
References are checked on the dates recorded in our evidence library. If a source has been superseded, tell us and we will update it.