95 citations
,
January 2007 in “Human biology” Human hair can be classified into eight types based on physical features, not ethnicity.
25 citations
,
June 2003 in “Journal of Investigative Dermatology Symposium Proceedings” Phototrichogram and hair diameter measurements are effective, noninvasive ways to assess hair growth and detect early hair loss, with the most common pattern being reduced hair density.
17 citations
,
May 2020 in “Forensic Science International Genetics” Genetically variant peptides are reliable for forensic identification despite age-related changes in hair proteins.
10 citations
,
September 2020 in “Metabolites” Hair color and length affect metabolite profiles in hair, so they should be considered in hair analysis.
December 2025 in “Neurobiology of Stress” People who recently attempted suicide during depression showed signs of adrenal fatigue, but had higher DHEA levels around the attempt time.
January 2024 in “Institutional Repositories DataBase (IRDB)” The method accurately measures steroid hormones in hair to study hormone dynamics related to hair loss.
September 2015 in “Research Portal (King's College London)” Human hair movement is affected by its inner structure and chemical treatments.
128 citations
,
January 1996 in “Journal of analytical toxicology.” Hair analysis can detect cocaine use but doesn't accurately show the amount or timing of use.
38 citations
,
October 2011 in “Analytical biochemistry” Hair proteins have weak spots in their α-helical segments.
23 citations
,
August 2019 in “Proceedings of the National Academy of Sciences of the United States of America” Pollution exposure speeds up hair damage.
22 citations
,
June 2012 in “Journal of Investigative Dermatology” Adiponectin may stimulate hair growth and could be a potential treatment for promoting hair growth.
21 citations
,
January 2016 in “NeuroImmunoModulation” Hair cortisol levels can indicate stress over the past three months.
12 citations
,
January 2020 in “Analyst” Researchers found markers that can tell if hair has been bleached, which could improve hair test accuracy.
8 citations
,
September 1995 in “Acta Dermato Venereologica” Calcipotriol treatment for scalp psoriasis does not cause hair loss.
July 2024 in “Occupational Medicine” Higher cortisol levels are linked to poor coping, while higher DHEA levels are linked to job confidence.
November 2023 in “Journal of animal science/Journal of animal science ... and ASAS reference compendium” Pig hair cortisol levels are inheritable and linked to stress responses, which could help select for more resilient pigs.
Genetic mutations linked to ectodermal dysplasias and hair loss were identified in Pakistani families.
158 citations
,
January 2003 in “Journal of Forensic Sciences” Hair testing can detect a single GHB exposure, useful for documenting sexual assault.
157 citations
,
April 1997 in “International journal of legal medicine” Cosmetic hair treatments like bleaching and dyeing reduce drug levels in hair samples.
116 citations
,
January 1957 in “Australian Journal of Agricultural Research” Certain hair follicle traits in Merino sheep may be inherited.
64 citations
,
January 2005 in “International Journal of Dermatology” Hair transplant destroyed by lichen planopilaris.
45 citations
,
January 2012 in “Experimental Dermatology” Human hair follicles switch between active and resting phases unpredictably.
44 citations
,
February 2016 in “Zoology” Hair cortisol levels in primates are useful for stress assessment but vary by age, sex, species, and hair collection methods.
36 citations
,
April 2016 in “Experimental Dermatology” Photobiomodulation may help with hair growth and wound healing, but research is inconsistent and needs better quality studies.
31 citations
,
August 2001 in “PubMed” TrichoScan accurately measures hair growth and showed improved hair counts and thickness after finasteride treatment.
30 citations
,
June 2022 in “Animals” Key genes, including KRT39 and KRT74, influence hair length in Inner Mongolia cashmere goats.
30 citations
,
December 2009 in “The FASEB Journal” Fluphenazine and iloprost can induce hair growth.
27 citations
,
October 2020 in “Experimental Dermatology” Having a lot of gray hair and hair loss are linked to more severe COVID-19.
27 citations
,
March 2013 in “Social Semiotics” Commercial hair loss websites promote Propecia by making men feel insecure about baldness and suggesting it's a medical issue needing treatment.
27 citations
,
September 1988 in “PubMed” Hair follicle shape determines hair type: curly, straight, or in-between.