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GlossaryTerminal 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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The Predictive Value of Midscalp Hair Density and Terminal Hair Percentage in the Severity Evaluation of Female Pattern Hair Loss Assessed by Trichoscan in a Sample of Chinese Population

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”

Midscalp hair density and terminal hair percentage are good indicators of female pattern hair loss severity.

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

October 2025 in “PubMed”

Amaranthus extract cream safely boosts hair growth in men with hair loss.

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”

Hair regrowth doesn't convert thin hairs to thick hairs, but increases overall hair density.

research Quantitative trichoscopic analysis of hair density in people attending tertiary care hospital – A cross-sectional study

1 citations , August 2024 in “Journal of Cutaneous and Aesthetic Surgery”

Hair density decreases with age, especially in the 60s.

The 1,927-nm Fractionated Thulium Laser Monotherapy Increases Hair Density in Patients with Male Pattern Hair Loss in Brazil: Prospective Clinical Study

research The 1,927-nm fractionated thulium laser monotherapy increases hair density in patients with male pattern hair loss in Brazil: prospective clinical study

December 2025 in “Medical Lasers”

The laser treatment increased hair density in men with hair loss.

research The Density Issue in Hair Transplantation

32 citations , September 1997 in “Dermatologic Surgery”

Mini-micrografting in hair transplants can give similar density to older methods with fewer sessions.

research Mapping the hair density, thickness, and volume in normal and androgenetic alopecia subjects with the digital microscope

December 2022 in “JEADV Clinical Practice”

Hair density and thickness decrease in specific scalp areas in people with androgenetic alopecia.

Mesenchymal Stem Cell-Derived Exosomes Can Effectively Improve Hair Count and Terminal Hair Diameter in Androgenetic Alopecia

research Mesenchymal Stem Cell-Derived Exosomes Can Effectively Improve the Hair Count and Terminal Hair Diameter in Androgenetic Alopecia

June 2025 in “Research Square (Research Square)”

Stem cell exosome injections can safely improve hair growth and thickness in men with hair loss.

Efficacy and Safety of a Low-Level Laser Device in the Treatment of Male and Female Pattern Hair Loss: A Multicenter, Randomized, Sham Device-Controlled, Double-Blind Study

research Efficacy and Safety of a Low-level Laser Device in the Treatment of Male and Female Pattern Hair Loss: A Multicenter, Randomized, Sham Device-controlled, Double-blind Study

147 citations , January 2014 in “American Journal of Clinical Dermatology”

Laser device increases hair density, safe for treating hair loss in men and women.

research Normal Hair Growth in Children

57 citations , November 1987 in “Pediatric Dermatology”

Children's hair grows in different types from before birth through puberty, with growth rates and characteristics varying by age, sex, and race.

A 6-Month, Randomized, Double-Blind, Placebo-Controlled Study Evaluating the Ability of a Marine Complex Supplement to Promote Hair Growth in Men with Thinning Hair

research A 6-month, randomized, double-blind, placebo-controlled study evaluating the ability of a marine complex supplement to promote hair growth in men with thinning hair

25 citations , August 2016 in “Journal of Cosmetic Dermatology”

The marine complex supplement significantly improved hair growth in men with thinning hair without adverse effects.

Comparison of the Effects of 665 nm Low-Level Diode Laser Hat Versus a Combination of 665 nm and 808 nm Low-Level Diode Laser Scanner on Hair Growth in Androgenic Alopecia

research Comparison of the effects of 665 nm low level diode Laser Hat versus and a combination of 665 nm and 808nm low level diode Laser Scanner of hair growth in androgenic alopecia

24 citations , May 2017 in “Journal of Cosmetic and Laser Therapy”

The laser scanner device was more effective at increasing hair density than the laser hat in treating androgenic alopecia.

research Hair regrowth following a Wnt- and follistatin containing treatment: safety and efficacy in a first-in-man phase 1 clinical trial.

16 citations , November 2011 in “PubMed”

The treatment improved hair growth in people with male pattern baldness.

research
Clinical Study to Evaluate the Efficacy and Safety of a Hair Serum Product in Healthy Adult Male and Female Volunteers with Hair Fall

14 citations , September 2020 in “Clinical, cosmetic and investigational dermatology”

The hair serum significantly improved hair growth and reduced hair fall without causing any skin issues.

research Clinical Study to Evaluate the Efficacy and Safety of a Hair Serum Product in Healthy Adult Male and Female Volunteers with Hair Fall

5 citations , September 2020 in “DOAJ (DOAJ: Directory of Open Access Journals)”

The hair serum effectively reduced hair fall and improved hair growth without causing any skin issues.

Quantitative Studies on Human Hair Growth: Fundamental Measurements and Evaluation of Hair Growers

research Quantitative Studies on Human Hair Growth(I). Fundamental Measurements and the Evaluation of Hair Growers.

3 citations , January 1994 in “Journal of Society of Cosmetic Chemists of Japan”

Hair grows slower and thinner with age, but a test tonic improved growth in alopecia subjects.

research Novel Electrotrichogenic Device Promotes Hair Growth in Men With Androgenetic Alopecia: A Pilot Study

April 2025 in “Journal of Cosmetic Dermatology”

The device safely increased hair growth and thickness in men with hair loss.

Evaluation of the Safety and Efficacy of Concentrated Growth Factors for Hair Growth Promotion in Androgenetic Alopecia Patients: A Retrospective Single-Center, Single-Arm Study

research Evaluation of the safety and efficacy of concentrated growth factors for hair growth promotion in androgenetic alopecia patients: A retrospective single‐centre, single‐arm study

August 2024 in “Journal of Cosmetic Dermatology”

CGF injections may safely and effectively promote hair growth in androgenetic alopecia patients.

research Clinical and instrumental characterization of hair and scalp aging in nonbalding Caucasian women

August 2018 in “Journal of The American Academy of Dermatology”

Aging significantly affects the hair and scalp of nonbalding Caucasian women, with changes that differ from male pattern baldness.

research Low-level light therapy and hair loss

January 2012 in “Human health handbooks”

Low-level light therapy is FDA-approved for male pattern hair loss, increases hair count and strength, and is considered safe for use.

Hair And Nails: Studies On Hair Loss, Chemical Matrixectomy, And Hair Transplantation Techniques

research 15. Hair and Nails

March 2009 in “Medical & surgical dermatology”

Women with androgenetic alopecia have fewer terminal hairs, phenol in nail surgery is safe, and a new hair transplant method is faster and less damaging.

research Evaluation of the safety and effectiveness of intradermal administration of QR678 Neo^® hair growth factor formulation: A phase‐IV, open‐label, single‐arm multi‐ethnicity clinical trial

2 citations , January 2022 in “Journal of Cosmetic Dermatology”

QR678 Neo® is a safe and effective treatment for hair loss in men and women.

research Efficacy Evaluation of a Novel Home-Used Device Based on a Multiple Stimulation Technology on Hair Growth in Patients with Androgenetic Alopecia

1 citations , August 2018 in “Madridge journal of dermatology & research”

The device effectively and safely increased hair growth in people with Androgenetic Alopecia.

Efficacy and Safety of Oral Spironolactone for Female Pattern Hair Loss in Premenopausal Women: A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Pilot Study

research Efficacy and safety of oral spironolactone for female pattern hair loss in premenopausal women: a randomized, double-blind, placebo-controlled, parallel-group pilot study

September 2025 in “International Journal of Women’s Dermatology”

Oral spironolactone effectively promotes hair growth in premenopausal women but may cause irregular menstruation.

Evaluation of the Efficacy of a Biomimetic Peptide Solution for Rejuvenation of Donor Scalp and as Storage Media for Hair Follicle Grafts During FUE Hair Transplantation

research Evaluation of the efficacy of a biomimetic peptide solution for rejuvenation of donor scalp and as storage media for hair follicle grafts during FUE hair transplantation

April 2025 in “Journal of Cosmetic and Laser Therapy”

QR678 Neo® improves hair transplant success and hair regrowth.

Advancing Hair Regrowth Assessment: Development and Standardization of Methods for Evaluating New Hair Growth, Hair Keratin Levels, and Scalp Health in Androgenetic Alopecia Patients

research Advancing Hair Regrowth Assessment: Development and Standardization of Methods for Evaluating New Hair Growth, Hair Keratin Levels, and Scalp Health in Androgenetic Alopecia Patients

February 2025 in “Cureus”

New methods reliably assess hair regrowth and scalp health in hair loss patients.