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GlossaryHair Shaft (Hair strand)

visible part of hair extending above the skin's surface

The hair shaft is the visible part of the hair that extends above the skin's surface. It is composed of three layers: the cuticle (outer layer), the cortex (middle layer), and the medulla (inner layer). The hair shaft is primarily made of keratin, a protein that provides strength and resilience. Understanding the structure of the hair shaft is crucial for professionals in dermatology and cosmetology, as it influences hair health, texture, and response to treatments.

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research Use of a Modified Hair Strand Test to Assess the Antifungal Activity Kinetics of Dog Hair After a 2% Climbazole Shampoo Application

2 citations, April 2016 in “Veterinary dermatology”

A 2% climbazole shampoo effectively reduces fungal growth on dog hair, and using a physiological shampoo afterward may boost this effect.

research Single Hair Fiber Assessment Techniques to Discriminate Between Mineral Oil and Coconut Oil Effect on Hair Physical Properties

3 citations, September 2020 in “Journal of cosmetic dermatology”

Coconut oil makes hair stronger and more flexible than mineral oil.

research Targeted Delivery of Zinc Pyrithione to Skin Epithelia

14 citations, September 2021 in “International journal of molecular sciences”

Zinc pyrithione needs targeted delivery to the scalp for effective dandruff treatment.

research Ocfentanil Testing in Hair from a Fatality Case: Comparative Analysis of a Lock of Hair Versus a Single Hair Fiber

1 citations, July 2021 in “Forensic science international”

Both a lock of hair and a single hair strand can show chronic drug use, but at least six single hairs are needed for accurate results.

research In Vitro Methodologies to Evaluate the Effects of Hair Care Products on Hair Fiber

13 citations, January 2017 in “Cosmetics”

Different tests are used to see how hair care products affect hair, and choosing the right test is important for accurate results.

research Cases: Severe Burns to Scalp Caused by Hair Bleaching

July 2007 in “Clinical Risk”

A woman got severe scalp burns from a salon's improper hair bleaching treatment.

research Different Localizations of Drugs Simultaneously Administered in a Strand of Hair by Micro-Segmental Analysis

20 citations, October 2017 in “Drug testing and analysis”

Drugs localize differently in hair strands based on their properties.

research Human Hair as a Testing Substrate in the Era of Precision Medicine: Potential Role of Omics-Based Approaches

1 citations, December 2018 in “IntechOpen eBooks”

Human hair shows promise for non-invasive medical testing, but more research is needed to standardize its use.

research Children’s Hair Cortisol and Hair Testosterone Concentrations in Response to Environmental Changes: From Summer Holidays to School

3 citations, November 2021 in “Stress”

Girls had higher stress hormone levels during school due to social and emotional issues, while boys had higher overall hormone levels with slight changes when school started.

research Physical and Mechanical Properties of the Hair Shaft: A Review of Measurement Techniques to Verify the Efficacy of Cosmetic Products

January 2024 in “Seven Editora eBooks”

Different techniques measure hair properties to ensure cosmetic products work.

research Towards Best Practice in Hair Metabolomic Studies: Systematic Investigation on the Impact of Hair Length and Color

10 citations, September 2020 in “Metabolites”

Hair color and length affect metabolite profiles in hair, so they should be considered in hair analysis.

research Development of Predictive Regression Model for Perceived Hair Breakage in Indian Consumers

1 citations, March 2019 in “International Journal of Cosmetic Science”

The model predicts hair breakage based on key hair properties and helps product developers.

research Hair-On-Hair Static Friction Coefficient Can Be Determined by Tying a Knot

5 citations, September 2017 in “Colloids and surfaces. B, Biointerfaces”

Tying a knot can measure hair friction, useful for medical applications.

Reimagining Hair Science: A New Approach to Classify Curly Hair Phenotypes via New Quantitative Geometrical and Structural Mechanical Parameters

research Reimagining Hair Science: A New Approach to Classify Curly Hair Phenotypes via New Quantitative Geometrical and Structural Mechanical Parameters

April 2023

A new system for classifying curly hair types using precise measurements can improve hair care products and cultural inclusion.

The Change of Copper, Zinc, Iodine, and Selenium Contents in the Scalp Hair of Healthy Females and the Efficacy of Herbal Extract Shampoo Treatment

research The Change of Copper, Zinc, Iodine, and Selenium Contents in the Scalp Hair of Healthy Females and the Efficacy of Herbal Extract Shampoo Treatment

April 2023 in “Acta Poloniae Pharmaceutica”

Herbal extract shampoo increased certain minerals in hair and improved hair growth and scalp health.

research An Automated Approach Towards Digital Photo-Trichogram for Hair Fall Diagnosis

January 2018 in “Communications in computer and information science”

Researchers developed a computer system to automatically diagnose hair loss by analyzing scalp images.

Vacuum Therapy with Plant Active Compounds, Prebiotics, and Probiotics for Androgenetic Alopecia, Female Pattern Hair Loss, and Telogen Effluvium: Follow-up Study

research Vacuum Therapy with Plant Active Compounds, Prebiotics, and Probiotics for Androgenetic Alopecia, Female Pattern Hair Loss, and Telogen Effluvium: Follow-up Study

January 2021 in “Journal of cosmetology & trichology”

The treatment improved hair growth and thickness in patients with hair loss, even 10 months after therapy without additional products.

research Comparison of Quality Performance of Human Hair Types with Herbal Oils by Analysis Techniques

3 citations, February 2023 in “ACS omega”

Grape seed oil improved hair quality the most, followed by rosehip and safflower seed oils, and reduced damage from shampoo.

research Case Report: Hair Care Routine to Treat Telogen Effluvium Associated With Post-COVID-19 Infection

September 2022 in “Journal of The American Academy of Dermatology”

A woman's COVID-19 related hair loss improved after using a specific hair care routine for 30 days.

research Justicia Procumbens Prevents Hair Loss in Androgenic Alopecia Mice

December 2023

Justicia procumbens extract may help prevent hair loss and improve hair thickness and shine in a type of hair loss condition.

Therapeutic Approach for Hair Growth and Regeneration Using Bioactive Formulation Containing Mesenchymal Stromal Cell-Derived Conditioned Medium

research Therapeutic Approach for Hair Growth and Regeneration Using Bioactive Formulation Containing Mesenchymal Stromal Cell-Derived Conditioned Medium

January 2023 in “Journal of Cosmetics, Dermatological Sciences and Applications”

The hair growth serum Trichosera® was effective in increasing hair regrowth and density and reducing hair fall without significant side effects.

research A Study on the Conditioning Effects of Natural Shampoos Using the Scanning Electron Microscope

10 citations, June 2001 in “International Journal of Cosmetic Science”

Natural shampoos made in the lab conditioned hair better than commercial ones with chemicals.

research A Review on Anti-Dandruff Herbal Shampoo

March 2024 in “International Research Journal of Modernization in Engineering Technology and Science”

The herbal shampoo made hair shinier, smoother, and softer without side effects.

research EtG Quantification in Hair and Different Reference Cut-Offs in Relation to Various Pathologies: A Scoping Review

12 citations, November 2022 in “Toxics”

EtG in hair can help detect alcohol use but may be inaccurate in people with certain health conditions.

Preparation and In Vitro Evaluation of Protective Effects of Quercetin-Loaded Solid Lipid Nanoparticles on Human Hair Against UV-B Radiation

research Preparation and In Vitro Evaluation of Protective Effects of Quercetin-Loaded Solid Lipid Nanoparticles on Human Hair Against UV-B Radiation

September 2024 in “Journal of Cosmetic Dermatology”

Quercetin-loaded nanoparticles protect human hair from UV-B damage.

research Anatomy and Physiology of Hair

14 citations, May 2017 in “InTech eBooks”

Hair is important for protection, social interaction, and temperature control, and is made of a growth cycle-influenced follicle and a complex shaft.

research Alopecia Types, Current and Future Treatment

3 citations, January 2021 in “Journal of dermatology & cosmetology”

Current alopecia treatments manage symptoms but don't cure, and better treatments are needed.