EGF helps goat hair stem cells grow best at 15 ng/mL.
52 citations
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December 1984 in “Journal of the American Geriatrics Society” Mineral levels in hair and serum don't help diagnose Alzheimer's.
1 citations
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October 2023 in “PloS one” Cosmetic hair treatments can increase hair testosterone levels, while natural hair color does not affect it.
Wildebeest stress and hormone levels are influenced by food availability, human presence, and reproductive cycles.
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.
69 citations
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May 2016 in “General and Comparative Endocrinology” External factors can significantly affect hair cortisol levels, so it's not always a reliable stress marker.
July 2025 in “International Journal of Dermatology Venereology and Leprosy Sciences” Higher stress levels may worsen alopecia areata, suggesting stress management is important for treatment.
January 2025 in “Scientific Reports” Hair analysis can show changes in vitamin D levels over time.
May 2024 in “Journal of trace elements in medicine and biology” Overweight or obese women before pregnancy have lower iron levels in their serum and hair during early pregnancy.
12 citations
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May 2024 in “Chemosphere” 2 citations
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January 2004 in “AIP conference proceedings” Hair analysis can help screen for serious diseases like cancer and osteoporosis.
April 2026 in “Frontiers in Veterinary Science” Male cats have higher stress levels than females.
August 2021 in “Asian Journal of Pharmaceutical and Clinical Research” Plant extracts in shampoo improved hair thickness and density in men with hair loss.
16 citations
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December 2005 in “Journal of Animal Physiology and Animal Nutrition” Moderate selenium levels in a dog's diet are best for hair growth.
15 citations
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June 1996 in “Journal of Pharmacy and Pharmacology” Caffeine levels in hair and blood can indicate liver health.
14 citations
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May 2019 in “Chemosphere” Females have higher Dechlorane Plus in hair, while males have more in dorm dust.
8 citations
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July 2002 in “X-Ray Spectrometry” Elemental composition of hair affects its x-ray diffraction patterns.
April 2026 in “Science & Justice” Hair analysis can confirm drug use but can't accurately measure how much was taken.
January 2026 in “Phaidra - Repository of the University of Veterinary Medicine, Vienna” Hair cortisol levels in wolves reflect stress and vary by season and body region.
August 2015 in “Psychoneuroendocrinology” October 2014 in “Journal of Nutrition & Food Sciences” Higher copper and lower chromium and selenium in hair are linked to insulin resistance in visceral-obese adults.
21 citations
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April 2009 in “Trace Elements and Electrolytes” Autistic children have lower iron and higher selenium in their hair.
12 citations
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March 2000 in “Clinical Chemistry” Chronic DHEA supplementation slightly increases testosterone in hair but stays within safe limits.
Zinc methionylglycinate at 160 ppm improves dog hair and zinc levels best.
3 citations
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April 2023 in “Journal of Veterinary Internal Medicine” Dogs with epilepsy have different hair mineral levels than healthy dogs, possibly due to epilepsy or its treatment.
January 2026 in “Journal of Trace Elements in Medicine and Biology” Dogs have more iron and copper in their hair than cats, and outdoor animals have higher iron levels.
December 2023 in “Archives of iranian medicine” Higher iron levels in hair may increase the risk of esophageal cancer.
51 citations
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March 1986 in “Acta Dermato Venereologica” Alopecia patients had similar element levels to normal people, except for differences in copper and low selenium.
136 citations
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February 2017 in “International Journal of Molecular Sciences” PRP treatment improves hair growth, and the device used can affect results, with some being more effective.
19 citations
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January 2003 in “Polish Journal of Environmental Studies” Higher lead levels were found in mothers of children with malformations.