July 2022 in “Research Square (Research Square)” Hair analysis can somewhat track past testosterone levels but is influenced by factors like hair washing, growth rate, sex, and hair color.
May 2022 in “Acta Scientific Women's Health” A woman lost over 80% of her hair due to a condition called telogen effluvium after having COVID-19.
January 2019 in “Hair transplant forum international” Clean and sterile gloves showed no difference in scalp contamination during hair transplant surgery.
February 2010 in “Journal of The American Academy of Dermatology” Social or cultural norms, not hair type, more likely influence how often people wash their hair.
October 2014 in “Journal of Minimally Invasive Gynecology” Genetic testing for cancer risk can lead to early and life-saving treatments in people without symptoms.
June 2014 in “Toxicologie analytique et clinique/Annales de toxicologie analytique” Older age increases positive hair alcohol test results, and chest hair is a good alternative for testing; season affects results, with higher levels in winter.
5 citations
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June 2017 in “BJU international” Pregnant female urologists should avoid certain drugs and use protective measures to stay safe.
August 2023 in “Journal of The American Academy of Dermatology” Early treatment is key for permanent hair loss disorders, with options ranging from medications and phototherapy to immunomodulators and antibiotics, depending on severity and type.
February 1938 in “Journal of the American Medical Association” Washing can prevent cancer from lubricating oils, extreme body temperatures need more study, Sulfomid is not recognized, no reliable diphtheria carrier treatment except surgery, eyelid injuries should heal before repair, heterophile antibody test is specific for mononucleosis, chlorine inhalations for colds are outdated, and wheat germ is safe.
3 citations
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January 2019 in “Skin research and technology” All wiping methods are as effective as washing for removing cleaning agent from hair.
1 citations
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August 1999 in “ACS symposium series” Polymer JR400 sticks to hair but washes off with detergent.
17 citations
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July 2019 in “Scientific reports” Surface and internal treatments can help prevent hair lipid loss during washing.
9 citations
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September 1977 in “Journal of Small Animal Practice” Mange in guinea pigs can be cured with gamma benzene hexachloride washes.
6 citations
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February 1974 in “The BMJ” The document concludes that scalp disorders can be treated with hair washing, specific shampoos, medications, and sometimes surgery or hair transplants, but hereditary baldness is untreatable.
1 citations
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September 2016 in “Brain Behavior and Immunity” Hair cortisol levels can indicate stress and are affected by washing frequency, not cosmetic treatments.
August 2018 in “Biomedical Journal of Scientific & Technical Research” Treated hair can fight dandruff and odor even after several washes.
November 2004 in “Qucosa (Saxon State and University Library Dresden)” Active agents mainly stay on the hair surface after short washes.
6 citations
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January 2016 in “JAMA Dermatology” Dirty dots are a common scalp finding in elderly women and can be washed away with shampoo.
1 citations
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January 2019 in “Archives of Clinical and Medical Case Reports” Changing hair's surface and structure can help protect its natural oils from being washed away.
April 2026 in “Cosmetics” The shampoo effectively covers gray hair gradually and maintains color after multiple washes.
May 2026 in “Zenodo (CERN European Organization for Nuclear Research)” Natural hair dyes are safer but have limited shades and may fade with washing.
36 citations
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December 2016 in “Journal of The American Academy of Dermatology” The normal range for the hair pull test is 2 hairs or fewer, and washing or brushing hair before the test does not affect the results.
7 citations
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September 2004 in “International Journal of Cosmetic Science” Blond hair lightens more with visible light directly, while ultraviolet light lightens it after washing by damaging other hair parts.
5 citations
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November 2010 in “Veterinary Record” The monkeys' skin infection was cured in eight weeks using oral terbinafine, topical washes, and disinfectant fogging.
2 citations
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August 2021 in “Canadian Family Physician” COVID-19 can cause rashes and worsen existing skin conditions, and behaviors like frequent hand-washing can lead to hand dermatitis.
1 citations
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March 2023 in “Journal of Natural Fibers” A gentler, less damaging method for curling hair using tyrosine works well initially but fades after washing.
Coreopsis tinctoria Nutt. extract can effectively dye hair yellow or dark brown with good wash durability.
September 2025 in “Clinical Toxicology” Contaminated wheat caused hair loss and other symptoms due to high selenium, but washing it with alkaline water helped.
157 citations
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June 2015 in “Psychoneuroendocrinology” Hair cortisol and cortisone levels increase with age, are higher in diabetics, vary by gender, decrease with frequent hair washing, and are lower in winter.
16 citations
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November 2020 in “PLOS ONE” Your lifestyle and health can affect your chances of getting COVID-19; not enough sleep, lots of exercise, and hair loss can increase risk, while washing hands, eating fruit daily, and taking vitamins A and C can lower it.