37 citations,
March 2014 in “Journal of Trace Elements in Medicine and Biology” Lower hair zinc and copper levels found in Turkish males with hair loss; higher BMI linked to less hair zinc.
36 citations,
October 2008 in “European journal of paediatric neurology” Valproic acid treatment may cause temporary hair loss due to reduced zinc and biotinidase levels, which tend to normalize after 6 months.
21 citations,
November 2017 in “Archives of Dermatological Research” Higher enzyme levels found in women with hair loss, suggesting hormone imbalance.
16 citations,
July 2020 in “Psychoneuroendocrinology” People with Parkinson's disease have higher levels of cortisone in their hair, which may indicate chronic stress hormone dysfunction.
122 citations,
October 2013 in “PEDIATRICS” Maternal stress during pregnancy affects a child's stress levels.
27 citations,
October 2013 in “Experimental dermatology” Scleroderma patients have lower hair miR-29a levels.
7 citations,
December 2014 in “Journal of dermatology” Hair shaft miR-221 levels can help detect malignant melanoma.
May 2023 in “General and comparative endocrinology” Monkey hair cortisol levels are not affected by how fast their hair grows.
10 citations,
June 2001 in “Annals of neurology” Alzheimer's patients have higher levels of certain chemicals in their hair.
January 2023 in “Neuroscience applied” People with an imbalance between their cognitive and emotional empathy have lower levels of the hormone oxytocin in their hair.
5 citations,
January 2021 in “PeerJ” Elephant tail-hair can show past stress levels, matching times when stressful events happened.
October 2023 in “Clinical medicine and medical research” Thyroid function may influence hair loss after COVID-19.
501 citations,
October 2008 in “Psychoneuroendocrinology” Hair cortisol levels can show increased stress during late pregnancy but only for up to six months.
12 citations,
December 2020 in “Comprehensive psychoneuroendocrinology” Hormone levels in hair change during pregnancy, with progesterone increasing significantly compared to non-pregnant women.
2 citations,
June 2021 in “Medicine” High levels of cortisol in hair are linked to a greater risk of brain aneurysm rupture.
May 2023 in “Animal Reproduction Update” High levels of cortisol in hair show long-term stress which can lower fertility in animals.
80 citations,
January 2011 in “Clinical Chemistry and Laboratory Medicine (CCLM)” Hair cortisol levels can reflect salivary cortisol levels in humans.
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.
18 citations,
January 1978 in “Advances in experimental medicine and biology” Hair cystine levels may indicate protein malnutrition, but more research is needed.
1 citations,
December 2021 in “American Journal of Obstetrics and Gynecology” Hair cortisol levels peak in the third trimester and decline postpartum.
1 citations,
January 2016 in “American Journal of Clinical and Experimental Medicine” Men with androgenic alopecia have different hair copper levels than those without.
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.
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.
March 2003 in “BJOG: An International Journal of Obstetrics and Gynaecology” Mothers and newborns with dental fillings have higher mercury in their hair, but adding fillings during pregnancy doesn't raise mercury levels further.
January 2016 in “American Journal of Clinical and Experimental Medicine” Lower zinc levels in hair are linked to more severe male pattern baldness, but blood zinc levels don't show this link. Age also increases baldness severity.
32 citations,
January 2017 in “Physiology & Behavior” New hair growth corticosterone levels are higher in diabetic mice, indicating long-term stress.
22 citations,
May 2019 in “Animals” High hair cortisol levels indicate stress in cows due to poor shelter conditions and health issues.
15 citations,
January 1971 in “Journal of animal science/Journal of animal science ... and ASAS reference compendium” Hair analysis can't determine ponies' calcium and phosphorus levels; use soil and feed tests instead.
15 citations,
October 1970 in “Archives of disease in childhood” Hair amino acid levels can indicate metabolic disorders.
3 citations,
November 2021 in “Stress” Girls had higher stress hormone levels during school due to social and emotional issues, while boys had higher overall hormone levels with slight changes when school started.