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Glossary Terminal Hair Density

number of thick, pigmented hairs per unit area

Terminal Hair Density refers to the number of thick, pigmented hairs (known as terminal hairs) per unit area of the scalp or other body regions. This measurement is often used in clinical settings to assess hair growth patterns, diagnose hair loss conditions like alopecia, and evaluate the effectiveness of hair restoration treatments.

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Research

5 / 1000+ results

research The Predictive Value of Midscalp Hair Density and Terminal Hair Percentage in the Severity Evaluation of FPHL Assessed by Trichoscan in a Sample of Chinese Population

1 citations , December 2022 in “Clinical, Cosmetic and Investigational Dermatology”

In this study, TrichoScan characteristics, particularly hair density and terminal hair percentage in the midscalp, were found to predictively classify female pattern hair loss in a Chinese population.

research Amaranthus Extract Promotes Healthy Follicles and Anagen Hair Density-A Randomized Placebo-Controlled, Double-Blinded Study.

October 2025 in “PubMed”

This study found that applying amaranthus extract cream to the scalp significantly improved terminal hair density, anagen hair count, and pilary index in men with male pattern hair loss, suggesting it may be a safe and effective supportive therapy.

research Hair Density in African Americans

129 citations , June 1999 in “Archives of Dermatology”

This study found that hair density is significantly lower in African Americans compared to whites, which may affect the evaluation and diagnosis of scalp biopsy specimens in this population.

research Hair diameter vs. hair density in male androgenetic alopecia

November 2014 in “British Journal of Dermatology”

Hair loss is due to thinner hairs, not less hairs; hair diameter indicates balding progression and treatment effectiveness.

research Hair regrowth in male and female pattern hair loss does not involve the conversion of vellus hair to terminal hair

14 citations , January 2016 in “Experimental Dermatology”

This analysis concluded that hair regrowth in male and female pattern hair loss treatments did not involve converting vellus hairs into terminal hairs, suggesting a reactivation of dormant non-vellus follicles instead.

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Community Join

5 / 566 results

community 52 year old norwood 6 vellus to terminal, 5 months progress

12 upvotes 3 months ago

A 52-year-old with Norwood 6 hair loss shows progress after 5 months using topical dutasteride, LLLT, copper peptides, Ulo serum, Minoxidil, cetirizine, and microneedling. Native hair is regrowing from vellus to terminal, with increased density in previously bald areas.

community 15 months topical 5% min and 0.5 dut. Is this also regrowth? Or could these grow into terminal hairs at some point?

4 upvotes 3 weeks ago

The user has been using topical 5% minoxidil and 0.5 mg dutasteride for 15 months, noticing stronger hair and some new growth. They have experienced hair loss for 10 years, underwent two hair transplants, and are seeing density improvements, particularly in the frontal scalp.

community Turning vellus hairs into terminal hair

in Research/Science 12 upvotes 1 year ago

People are discussing hair loss treatments, including minoxidil, finasteride, and RU58841, to turn vellus hairs into terminal hairs. Some users also mention using antibiotics, oral minoxidil, dutasteride, DHT blockers, biotin, and natural remedies like onion juice and seeds to improve hair growth.

community can we talk about the effect of DHT on hair TEXTURE (not just thickness/density)

41 upvotes 1 month ago

Finasteride treatment improved hair texture and reduced frizz for some users, though full restoration of original texture may take time. Hair texture changes were noted across the head, with some areas responding faster to treatment.

community New Hair Loss Treatment: Adipose Derived Secretomes

18 upvotes 1 year ago

Adipose-derived stem cell secretome showed significant improvement in hair density and growth, especially when combined with minoxidil, suggesting a synergistic effect. The study had limitations, including a small sample size and potential bias.

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Learn

3 / 4 results

learn Hair Multiplication

extract, clone, and reinsert your own hair cells

learn Follistatin

Protein that blocks activin, a growth-regulating signal

learn Clascoterone

How long does it take for clascoterone to show results on hair growth? Clascoterone is not approved for hair loss; it is investigational. In trial results reported by the company (not yet peer-reviewed), with twice-daily use, terminal hair counts rose by about 6 months and further gains were reported up to 12 months.

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Clinics

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Experts

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SMP Specialist
Hairo Fallas
Newark, NJ, United States

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Hairo Fallas