50 citations
,
July 2018 in “Psychoneuroendocrinology” Hair cortisol can indicate long-term stress levels, but hair growth rate differences may affect accuracy.
Hair cortisol content can indicate cortisol exposure and varies with age, puberty, and BMI in youth.
1 citations
,
September 2019 in “Journal of Investigative Dermatology” Human hair matrix cells and dermal papilla fibroblasts can form early hair follicle structures but don't produce hair shafts yet.
October 2023 in “Dermatology practical & conceptual” Finger length ratios might help predict common hair loss.
4 citations
,
October 1988 in “Clinics in Dermatology” Dihydrotestosterone (DHT) is crucial for conditions like male-pattern baldness and acne, and measuring a byproduct, androstanediol glucuronide, is a better way to assess DHT's effects than DHT blood levels.
1 citations
,
January 2016 in “Journal of Microbial & Biochemical Technology” The Free Androgen Index (FAI) is the best indicator of early hair loss in men before age 30.
September 2017 in “Journal of Investigative Dermatology” HIF-1A may aid hair growth, Backhousia citriodora improves skin, autologous cells stabilize hair loss, infrared thermography assesses alopecia, and a new treatment preserves hair.
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.
December 2025 in “ILDS-DEV”
45 citations
,
June 2008 in “Journal of pharmaceutical and biomedical analysis” The method effectively identifies banned substances in hair loss and skin disease cosmetics.
24 citations
,
April 2006 in “Journal of the American Academy of Dermatology” Heat shock protein 27 is more present in the active growth phase of human scalp hair follicles.
January 2008 in “HAL (Le Centre pour la Communication Scientifique Directe)” The mutant HR bmh protein affects hair follicle formation by failing to repress vitamin D receptor activity.
7 citations
,
January 1971 in “Archives of Dermatological Research” 95 citations
,
July 2006 in “British Journal of Dermatology” Vitamin D receptors in hair follicles change with the hair cycle, affecting hair growth.
22 citations
,
January 2010 in “Clinical Medicine Insights Endocrinology and Diabetes” Forearm hair has more cortisol than lower leg hair.
8 citations
,
July 1997 in “Archives of Gerontology and Geriatrics” 34 citations
,
January 2016 in “Analytical Chemistry” A new method can quickly and accurately detect drugs in hair.
4 citations
,
May 2021 in “Molecules” The hair test for vitamin D could be a useful alternative to blood tests, providing a longer-term vitamin D status, but more research is needed.
24 citations
,
September 2012 in “Dermatologic Surgery” The conclusion is that normal scalp hair counts for Taiwanese people were established, showing age-related differences but not sex or scalp location differences.
September 2024 in “Journal of the American Academy of Dermatology” Dermatologists can detect smaller hair density changes than previously thought.
August 1994 in “Journal of dermatological science” Mouse hair cells respond to male hormones by growing less, and this can be stopped by certain blockers.
15 citations
,
May 2013 in “American Journal of Medical Genetics - Part A” People with X-linked hypohidrotic ectodermal dysplasia have no sweat ducts and less, thinner hair.
July 2022 in “Journal of Investigative Dermatology” Skin produces different hormones depending on body part and sex, and a new method can measure them.
78 citations
,
November 2005 in “Endocrinology” Hairless protein can block vitamin D activation in skin cells.
5 citations
,
September 2020 in “Journal of Cosmetic Dermatology” Dexpanthenol improves hair growth and satisfaction in women without side effects.
22 citations
,
April 1972 in “Journal of Steroid Biochemistry” Beard hair follicles convert testosterone to 5α-dihydrotestosterone most intensively.
July 2022 in “The journal of investigative dermatology/Journal of investigative dermatology” Scientists created a detailed map of gene activity in different parts of human hair follicles.
14 citations
,
November 2012 in “SLAS discovery” Some herbal extracts can promote hair growth and prevent hair loss.
January 2001 in “Biomedical Research” THH and PAD type III appear together early in hair growth, but deiminated THH appears later, suggesting another factor is involved.
July 2025 in “Journal of the American Academy of Dermatology” Hair diameter diversity helps assess hair loss, but its standard measure varies by individual and ethnicity.