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GlossaryHair Density

number of hair follicles per square inch of scalp

Hair density refers to the number of individual hair strands per square inch (or square centimeter) of the scalp. It is an important factor in determining the overall appearance of hair volume and can vary significantly from person to person. High hair density means more hair follicles are packed closely together, while low hair density indicates fewer follicles in the same area. This term is crucial in fields like dermatology and trichology for diagnosing hair loss conditions and planning treatments such as hair transplants.

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A Clinical Study to Evaluate the Effectiveness of Rosmarinus Officinalis Mother Tincture in Improving Hair Volume and Density in Patients with Diffuse Cyclical Hair Loss Through Hair Shedding Visual Scale and Ponytail Thickness Test

research A Clinical Study to Evaluate Effectiveness of Rosmarinus officinalis Mother Tincture in Improving Hair Volume and Density in Patients with Diffuse Cyclical Hair Loss Through Hair Shedding Visual Scale and Ponytail Thickness Test

March 2026 in “International Journal of Research and Review”

Rosmarinus officinalis tincture significantly improves hair volume and density.

research Potential of Hibiscus Rosa-Sinensis L. and Baccaurea Racemosa Extract as a Hair Growth with Tail Suspension Test Stress-Induced Alopecia

August 2022 in “Ad-Dawaa' Journal of Pharmaceutical Sciences”

Hibiscus rosa-sinensis L. and Baccaurea racemosa extracts help hair growth.

Hair Growth Stimulation in Testosterone-Induced Alopecic Mice: A Comparative Study Between Topical Clove Oil 10% and Topical Minoxidil 5%

research Hair Growth Stimulation in Testosterone-Induced Alopecic Mice: A Comparative Study between Topical Clove Oil 10% Topical Minoxidil 5% Research ArticleJournal of the Faculty of Medicine BaghdadPrint ISSN: 0041-9419, Online ISSN: 2410-8057DOI: https://doi.org/10.32007/jfacmedbaghdad2977. Hair Growth Stimulation in Testosterone-Induced Alopecic Mice: A Comparative Study between Topical Clove oil 10% Topical Minoxidil 5%

June 2025 in “Journal of the Faculty of Medicine Baghdad”

Clove oil may help hair growth like minoxidil, but more human tests are needed.

research Effects of Intramuscular Testosterone Undecanoate on Body Composition and Bone Mineral Density in Female-to-Male Transsexuals

105 citations , June 2010 in “The journal of sexual medicine”

Testosterone undecanoate increases lean mass and causes various physical changes in female-to-male transsexuals.

research Correlation of Serum 3α-Androstanediol Glucuronide with Acne and Chest Hair Density in Men

51 citations , November 1988 in “The Journal of Clinical Endocrinology & Metabolism”

Higher levels of a specific hormone are linked to more chest hair and acne in men.

Circulating and Intraprostatic Sex Steroid Hormonal Profiles in Relation to Male Pattern Baldness and Chest Hair Density Among Men Diagnosed with Localized Prostate Cancers

research Circulating and intraprostatic sex steroid hormonal profiles in relation to male pattern baldness and chest hair density among men diagnosed with localized prostate cancers

7 citations , October 2017 in “The Prostate”

Baldness in men with prostate cancer is linked to higher levels of certain sex hormones, but chest hair density is not.

research Akkermansia muciniphila promotes testosterone‐mediated hair growth inhibition in mice

October 2023 in “FASEB bioAdvances”

Akkermansia muciniphila may help prevent testosterone-related hair loss.

research Effect of Adiantum Capillus veneris Linn on an Animal Model of Testosterone-Induced Hair Loss.

13 citations , January 2014 in “PubMed”

Adiantum capillus-veneris Linn reduced hair loss and improved hair growth in mice with testosterone-induced alopecia.

research Effect of Cyproterone Acetate Orally on Hair Density and Diameter and Endocrine Factors in Women with Idiopathic Hirsutism

14 citations , January 1980 in “Dermatology”

Cyproterone acetate temporarily reduces hair growth in women with idiopathic hirsutism but doesn't change hormone levels.

research EEMCO Guidance for the Assessment of Hair Shedding and Alopecia

51 citations , January 2004 in “Skin Pharmacology and Physiology”

The document explains hair growth and shedding, factors affecting it, and methods to evaluate hair loss, emphasizing the importance of skin biopsy for diagnosis.

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 science and technology

3 citations , December 2003 in “Micron”

The book "Hair Science and Technology" provides a deep understanding of hair biology and genetics, discusses hair growth, density, and diseases, and offers methods for managing hair loss and caring for hair growth.

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

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 Revitalizing Hair Growth: A New Regimen Utilizing Growth Factor Concentrate for Hair Loss Treatment

June 2024 in “Cureus”

GFC injections significantly improved hair growth and quality with minimal side effects.

research Efficacy and Safety of DR SKS Hair Growth Booster Serum in Adult Male and Female with Androgenic Alopecia

May 2023

The serum is safe and effective for treating hair loss.

research Comparative Efficacy of Topical Minoxidil Alone Against Combination of Topical Minoxidil and Platelet Rich Plasma in Women with Female Pattern Hair Loss-A Pilot, Open Randomised Trial.

January 2023 in “PubMed”

Minoxidil alone is as effective as combining it with PRP for treating female pattern hair loss.

research Injectable platelet-rich fibrin for treatment of female pattern hair loss

May 2024 in “Journal of Cosmetic and Laser Therapy”

Injectable platelet-rich fibrin improves hair growth and reduces hair loss in women.

research Phamacopuncture and Dermal Application of Sebalgukhwa-san: Effects on Hair Growth in a Mouse Model of Alopecia

May 2019 in “Journal of Acupuncture Research”

Sebalgukhwa-san (SGS) can help treat hair loss without liver toxicity.

Effect and Mechanism of YH0618 Granule on Chemotherapy-Induced Hair Loss in Patients with Breast Cancer: Study Protocol for a Randomized, Double-Blind, Multi-Center Clinical Trial

research Effect and mechanism of YH0618 granule on chemotherapy- induced hair loss in patients with breast cancer: study protocol for a randomized, double-blind, multi-center clinical trial

January 2019 in “Research Square (Research Square)”

The trial will test if YH0618 granule prevents hair loss in breast cancer patients during chemotherapy.

research A preliminary result of adipose derived stem cell treatment for female pattern hair loss

April 2021 in “Journal of Cosmetic Dermatology”

Stem cell treatment improved hair density in female hair loss patient.

research Potential adverse effects of long-term testosterone therapy

72 citations , October 1998 in “Baillière's clinical endocrinology and metabolism”

Long-term testosterone therapy can cause hormone suppression, affect prostate and heart health, and alter physical characteristics, but does not increase prostate cancer risk and needs more research for full risk assessment.

research Effects of lifelong testosterone exposure on health and disease using Mendelian randomization

29 citations , October 2020 in “eLife”

Higher testosterone levels can increase the risk of certain diseases like type 2 diabetes in women and prostate cancer in men, but can also protect against autoimmune diseases and hair loss. It also affects body fat and bone density.

research Clinical benefits and adverse effects of genetically-elevated free testosterone levels: a Mendelian randomization analysis

4 citations , August 2019

Higher free testosterone levels can increase bone density and decrease body fat but may raise the risk of prostate cancer, hair loss, and benign prostate enlargement.

A Comparative In Vivo and In Vitro Evaluation of Hair Growth Potential of Extracts and an Isolate from Petroleum Ether Extract of Cuscuta Reflexa Roxb

research A comparative in vivo and in vitro evaluation of hair growth potential of extracts and an isolate from petroleum ether extract of Cuscuta reflexa Roxb

7 citations , September 2014 in “Beni-Suef University Journal of Basic and Applied Sciences”

Cuscuta reflexa extracts and an isolate promoted hair growth and could be natural treatments for hair loss.

research Characterizing the role of facial hair in gender identity and expression among transgender men

3 citations , August 2021 in “Journal of the American Academy of Dermatology”

Facial hair is crucial for transgender men's gender identity and transition.

Formulation Development and Investigations on Therapeutic Potential of Nanogel from Beta Vulgaris L. Extract in Testosterone-Induced Alopecia

research Formulation Development and Investigations on Therapeutic Potential of Nanogel from Beta vulgaris L. Extract in Testosterone-Induced Alopecia

2 citations , January 2023 in “BioMed Research International”

Beetroot extract nanogel may help treat hair loss caused by testosterone.

research Predictors of Scalp Hair Thinning in Women with Polycystic Ovary Syndrome

2 citations , January 2016 in “US Endocrinology”

Scalp hair thinning in women with PCOS is linked to metabolic issues like abnormal glucose tolerance, high LDL, and skipped meals.

research Does creatine cause hair loss? A 12-week randomized controlled trial

April 2025 in “Journal of the International Society of Sports Nutrition”

Creatine does not cause hair loss.

Efficacy of a Wheat Polar Lipid Complex in Reducing Hair Loss and Improving Hair Growth in Healthy Women: A Randomized, Double-Blind, Placebo-Controlled Clinical Study

research Efficacy of a wheat polar lipid complex in reducing hair loss and improving hair growth in healthy women: A randomized, double‐blind, placebo‐controlled clinical study

November 2023 in “International Journal of Cosmetic Science”

Wheat polar lipid complex reduces hair loss and improves hair growth in women.

research Melatonin and hair physiology: reasons and clinical efficacy data as a topical treatment of androgenic alopecia

March 2014 in “Medicina cutánea ibero-latino-americana”

Melatonin applied to the scalp helps increase hair density in people with early hair loss.