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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 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 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 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.

The Ludwig Pattern of Androgenetic Alopecia Is Due to a Hierarchy of Androgen Sensitivity Within Follicular Units That Leads to Selective Miniaturization and a Reduction in the Number of Terminal Hairs Per Follicular Unit

research The Ludwig pattern of androgenetic alopecia is due to a hierarchy of androgen sensitivity within follicular units that leads to selective miniaturization and a reduction in the number of terminal hairs per follicular unit

47 citations , September 2008 in “British Journal of Dermatology”

Ludwig pattern hair loss in women results from varying sensitivity in hair follicles, causing fewer visible hairs.

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 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.

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.

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 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.

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.

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.

QR 678 and QR678 Neo vs PRP—A Randomized, Comparative, Prospective Study

research QR 678 & QR678 Neo Vs PRP—A randomised, comparative, prospective study

14 citations , April 2020 in “Journal of Cosmetic Dermatology”

QR678 treatments were more effective and comfortable for male hair loss than PRP treatments.

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.

Commentary on a Randomized Placebo-Controlled, Double-Blind, Half-Head Study to Assess the Efficacy of Platelet-Rich Plasma on the Treatment of Androgenetic Alopecia

research Commentary on a Randomized Placebo-Controlled, Double-Blind, Half-Head Study to Assess the Efficacy of Platelet-Rich Plasma on the Treatment of Androgenetic Alopecia

4 citations , March 2016 in “Dermatologic Surgery”

PRP treatment increased hair density, especially in men and younger patients with AGA.

research Double-Blind, Placebo-Controlled Pilot Study on the Use of Platelet-Rich Plasma in Women With Female Androgenetic Alopecia

3 citations , May 2017 in “Dermatologic Surgery”

PRP may help treat female hair loss, but more research needed.

A Study to Assess the Efficacy of Fractional Carbon Dioxide Laser with Topical Platelet-Rich Plasma in the Treatment of Androgenetic Alopecia

research A study to assess the efficacy of fractional carbon dioxide laser with topical platelet-rich plasma in the treatment of androgenetic alopecia

2 citations , January 2022 in “Lasers in Medical Science”

Using a carbon dioxide laser and platelet-rich plasma together can effectively restore hair and patients are generally satisfied with the results.

research Platelet-rich plasma in interventional dermatology and trichology: How far have we come?

2 citations , June 2021 in “Cosmoderma”

Platelet-rich plasma (PRP) shows promise in skin and hair treatments but results vary with preparation methods.

research Low-level laser therapy for androgenic alopecia

2 citations , October 2014 in “International Journal of Trichology”

Low-level laser therapy may increase hair density in pattern hair loss.

research Effects of dietary supplements on androgenetic alopecia: a systematic review and network meta-analysis

January 2026 in “Frontiers in Nutrition”

Certain dietary supplements can improve hair density and are well-tolerated for treating androgenetic alopecia.

Uncontrolled Clinical Trial of Quality- and Quantity-Cultured Peripheral Blood Mononuclear Cell Treatment for Androgenic Alopecia

research Uncontrolled Clinical Trial of Quality- and Quantity-cultured Peripheral Blood Mononuclear Cell Treatment for Androgenic Alopecia

October 2025 in “Plastic & Reconstructive Surgery”

MNC-QQ cell therapy improved hair growth and quality of life in men with androgenic alopecia without adverse effects.

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.

Investigator-Blinded, Controlled, and Randomized Comparative Study on 1565 Nm Non-Ablative Fractional Laser Versus 5% Minoxidil for Treatment of Androgenetic Alopecia

research Investigator‐blinded, controlled, and randomized comparative study on 1565 nm non‐ablative fractional laser versus 5% minoxidil for treatment of androgenetic alopecia

January 2024 in “Journal of Cosmetic Dermatology”

The 1565 nm non-ablative fractional laser is more effective and satisfying than 5% minoxidil for treating hair loss.

research Re-Densification Effect of Pressure-Injected Peptide-Hyaluronic Acid Combination on Male Androgenic Alopecia

January 2024 in “Journal of Cosmetics, Dermatological Sciences and Applications”

Injecting a peptide-hyaluronic acid mix improved hair growth in men with hair loss and was safe.

Comparative Efficacy of Topical Finasteride (0.25%) in Combination With Minoxidil (5%) Against 5% Minoxidil or 0.25% Finasteride Alone in Male Androgenetic Alopecia: A Pilot, Randomized Open-Label Study

research Comparative efficacy of topical finasteride (0.25%) in combination with minoxidil (5%) against 5% minoxidil or 0.25% finasteride alone in male androgenetic alopecia: A pilot, randomized open-label study

March 2023 in “International Journal of Trichology”

Using both minoxidil and finasteride together is more effective for male hair loss than using either one alone.

Combination of a Non-Ablative 1,927 nm Thulium Fiber Fractional Laser and Autologous Platelet-Rich Plasma in Treatment of Male Androgenetic Alopecia: A Pilot Study

research Combination of a non-ablative 1,927 nm thulium fiber fractional laser and autologous platelet-rich plasma in treatment of male androgenetic alopecia: A pilot study

January 2019 in “Chulalongkorn Medical Journal”

Using a special laser and platelet-rich plasma together is safe and improves hair growth in men with hair loss.

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.