May 2023 in “Frontiers in chemistry” Zolpidem shows up in hair from the top back of the head after one dose and fades over time, suggesting it gets into hair through blood and sweat.
Acidic sandy clay damages archaeological hair the most, while dry conditions preserve but make it brittle; silicone oil can help keep the hair flexible.
4 citations,
January 2015 in “Journal of microbial & biochemical technology” Biotin helps regulate proteins in the blood, which may explain its role in hair growth.
9 citations,
November 2015 in “Key Engineering Materials” Improving skills and technology in Baluchistan's wool industry could boost quality, jobs, and Pakistan's economy.
May 2017 in “Journal of microscopy and ultrastructure” Water quality affects mineral content in hair, and coconut oil can protect against damage.
10 citations,
May 2012 in “PloS one” Low ERCC3 gene activity is linked to non-pigmented hair growth.
Hair properties change under electromagnetic fields and are influenced by individual characteristics and the environment.
11 citations,
April 2022 in “Biophysical Journal” Disulfide bonds in keratin fibers break more easily under stress, especially when wet, affecting fiber strength.
Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
115 citations,
November 2004 in “Brain Behavior and Immunity” Stress increases nerve fibers and immune cell activity in mouse skin, possibly worsening skin conditions.
10 citations,
January 2007 in “Dermatologic Surgery” Artificial hair fibers help treat scalp scars with few complications and a 20% yearly fiber fall rate.
5 citations,
April 2016 in “Proceedings of the Latvian Academy of Sciences. Section B, Natural, Exact and Applied Sciences” Researchers created small amber particles for use in bioactive and biocompatible fibers that could help with skin and hair restoration and are safe for infant clothing.
January 2018 in “72° Congresso di Anatomia e Istologia” 
January 2007 in “Dermatologic Surgery” Artificial hair fibers help treat scalp scars with few complications and a 20% yearly fiber fall rate.
3 citations,
February 2019 in “Animal biotechnology” The PLP2 gene affects cashmere fiber quality in goats and is linked to hair growth and loss.
7 citations,
January 2001 in “Annales de zootechnie” Melatonin treatment increases wool production and improves fiber quality in angora rabbits.
December 2021 in “Cosmetics” 
66 citations,
February 2015 in “Cell & tissue research/Cell and tissue research” The document concludes that there are no effective clinical treatments for hearing loss due to hair cell damage, but research is ongoing.
November 2023 in “Hair transplant forum international” Caffeine can stimulate hair growth, but the best dose and frequency for hair loss treatment are still unknown.
89 citations,
August 2008 in “Human genetics” The EDAR gene greatly affects hair thickness in Asian populations.
75 citations,
December 2011 in “British Journal of Dermatology” Female pattern hair loss can be treated with medications, surgery, and cosmetic products, considering its psychological impact.
62 citations,
January 2004 in “The journal of investigative dermatology/Journal of investigative dermatology” A second domain of high sulfur KAP genes on chromosome 21q23 is crucial for hair structure.
23 citations,
September 2015 in “PLOS ONE” Mesenchymal stem cells, especially injected into the skin, heal wounds faster and better than chitosan gel or other treatments.
17 citations,
August 2012 in “Archives of Pharmacal Research” Acankoreoside J from Acanthopanax koreanum may help promote hair growth.
15 citations,
February 1999 in “The anatomical record” Some mutant mice have hair with abnormal cross-linking, mainly in the cuticle, not affecting other hair parts.
7 citations,
September 2014 in “European Journal of Dermatology” Thicker hair grows faster; hair loss patients have slower growth.
7 citations,
April 2014 in “Cell biology international” Melatonin treatment helps improve skin health in postmenopausal rats.
5 citations,
October 2011 in “Small ruminant research” Goat hair growth and follicle activity change with the seasons and differ between males and females.
Understanding hair surface properties is key for effective hair care products.
1 citations,
December 2015 in “The Egyptian Journal of Histology” Hypothyroidism harms rat skin, but topical triiodothyronine may help improve it.