April 2012 in “Informa Healthcare eBooks” The document concludes that diagnosing hair loss requires evaluating multiple histological features, as no single feature is definitive on its own.
3 citations
,
January 2020 in “Annals of Dermatology” More atypical club hairs may indicate Telogen Effluvium.
7 citations
,
June 2020 in “Experimental dermatology” Researchers found that certain lipids, especially vitamin D3, are lower in prematurely grey hair than in pigmented hair.
3 citations
,
October 1990 in “Journal of the American Academy of Dermatology” Mechanical trauma like towel drying can cause knotted hair even in straight hair.
January 1996 in “Journal of Investigative Dermatology”
July 2016 in “Indian journal of science and technology” Neonate scalp hair is thinner, lacks a medulla, and has smaller follicles compared to adult hair.
35 citations
,
January 2006 in “Dermatology Online Journal” Lipedematous scalp may be underdiagnosed and doesn't improve with finasteride.
5 citations
,
September 2015 in “BMC Medical Genetics” The EDAR gene mutation leads to thinner and more deformed hair shafts.
13 citations
,
January 2001 in “Pediatric dermatology” A dark-haired Chinese girl had hair that looked banded under certain light but was normal under a microscope.
January 2022 in “The Pan African medical journal” Hypertrichosis causes excessive hair growth and needs psychological support due to its impact on self-esteem.
73 citations
,
November 1979 in “British Journal of Dermatology” Minoxidil can cause excessive hair growth.
51 citations
,
December 2003 in “The FASEB Journal” The substance AS101 can help hair grow by slowing down hair cell aging and boosting a hair growth protein.
September 2025 in “Cosmetics” NMN supplements may improve hair quality and appearance in middle-aged women.
15 citations
,
May 1989 in “PubMed” Psoriasis on the scalp causes smaller oil glands and thinner hair but doesn't lead to hair loss.
15 citations
,
July 2004 in “Journal of morphology” Monotreme hair structure and protein distribution are similar to other mammals, but their inner root sheath cornifies differently, suggesting a unique evolution from reptile skin.
June 2024 in “Skin Research and Technology” Severe male pattern hair loss is linked to lower hair density in the back of the head.
16 citations
,
October 2012 in “British Journal of Dermatology” Chemotherapy can cause significant hair thinning and changes in hair texture, while tamoxifen has a smaller effect.
51 citations
,
March 1990 in “Journal of Investigative Dermatology” 11 citations
,
January 2005 in “Brazilian Journal of Medical and Biological Research” Hairless USP mice have enlarged skin cysts as they age.
3 citations
,
January 2021 in “Wear” Hair's resistance to wear varies by ethnicity and treatment, with less wear indicating stronger hair.
February 2026 in “Journal of the Korean Society of Cosmetology” The ampoule significantly improves hair density, thickness, and usability without side effects.
1 citations
,
February 2025 in “Journal of the American Academy of Dermatology” Most men prefer keeping their eyebrows over scalp hair.
1 citations
,
June 2019 in “Oral diseases” July 2022 in “Zenodo (CERN European Organization for Nuclear Research)” Nutrient-rich shampoos can help revitalize hair and potentially reverse thinning.
December 2011 in “대한본초학회지(본초분과학회지)” Gyungohkgo-gamibang extract significantly promotes hair growth and thickness.
35 citations
,
March 2007 in “Skin Research and Technology” The conclusion is that exogen is a unique hair cycle phase and the new sampling method specifically targets this stage, which may help in future hair loss research.
N793 may improve hair density in people with mild hair thinning.
14 citations
,
January 2016 in “Experimental Dermatology” Hair regrowth doesn't convert thin hairs to thick hairs, but increases overall hair density.
10 citations
,
October 2002 in “Journal of The American Academy of Dermatology” The document concludes that a man's long hair may have helped diagnose his rare case of chronic hair shedding, for which no treatment is advised.
May 2025 in “Health Science Reports” Serum WS Biotin significantly reduces hair shedding and improves hair thickness.