5 citations,
January 2021 in “PeerJ” Elephant tail-hair can show past stress levels, matching times when stressful events happened.
Cows moving from tie-stall to free-stall housing had more heel problems, less joint lesions, and higher stress levels.
7 citations,
May 2021 in “General and comparative endocrinology” Muskoxen's qiviut cortisol levels indicate their stress hormone activity over the hair growth period.
4 citations,
February 2019 in “American Journal of Human Biology” Collecting hair from all scalp sections works as well as the standard method for cortisol analysis.
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.
10 citations,
November 2019 in “Neuroendocrinology” Measuring 17-hydroxyprogesterone in hair can help monitor androgen levels in people with congenital adrenal hyperplasia.
7 citations,
October 2015 in “American Journal of Primatology” Monkeys with hair loss during pregnancy showed higher stress hormone levels and invested differently in their offspring.
1 citations,
December 2018 in “IntechOpen eBooks” Human hair shows promise for non-invasive medical testing, but more research is needed to standardize its use.
33 citations,
January 2017 in “Conservation physiology” Measuring reproductive hormones in brown bear hair could help identify their sex and reproductive state, but better collection methods or lab techniques are needed.
5 citations,
September 2016 in “Journal of Cosmetic Dermatology” Nourkrin® with Marilex® may increase hair count by 35.7% in postpartum hair loss.
3 citations,
October 2021 in “Clinica Chimica Acta” Hormone levels in hair vary across the head, with the highest concentration of a key hormone linked to hair loss at the top.
March 2024 in “American journal of veterinary research” Clippers are the best tool for collecting dog hair for chemical tests, being fast and stress-free for the dog.
October 2023 in “Animal production science” Vitamin A deficiency changes cattle hair structure, while pregnancy may improve it, suggesting hair can indicate cattle health.
102 citations,
July 2020 in “International journal of molecular sciences” Hormones like testosterone and estrogen significantly affect hair growth and structure.
June 2023 in “International journal of molecular sciences” Heat stress changes goats' skin and hair at the microscopic level and affects their genes and skin bacteria.
October 2022 in “European heart journal” Higher stress levels were found about two weeks before a heart attack.
October 2020 in “Tierärztliche Praxis. Ausgabe Grosstiere, Nutztiere” Cows moving from tie-stalls to free-stalls had fewer leg injuries but more stress and heel horn erosions.
1 citations,
August 2020 in “British Journal of Dermatology” Caffeine may protect hair follicles from stress-related hair loss.
19 citations,
March 2021 in “Obesity surgery” Many people experience hair loss after weight loss surgery, especially younger women, and it's linked to lower levels of zinc, folic acid, and ferritin.
3 citations,
February 2019 in “Journal of Cosmetic Dermatology” The effects of estrogen on human scalp hair growth are unclear and need more research.
April 2024 in “Journal of wildlife diseases” Muskox hair growth rates vary widely, so a single growth rate can't be used for all populations.
December 2023 in “Advances in economics, management and political sciences” Consumers prefer general hair care products over those specifically for hair loss.
Stress significantly contributes to hair loss, especially in women and those aged 31-40.
November 2021 in “Egyptian Journal of Medical Microbiology” COVID-19 protective measures led to skin irritation, hair loss, and brittle nails; using skin-friendly products and a healthy diet is recommended.
January 2021 in “bioRxiv (Cold Spring Harbor Laboratory)” Mothers have more hair proteins than their children, with age-related differences in protein patterns, and some proteins in hair could indicate early childhood development.
8 citations,
April 2020 in “European Journal of Nutrition” Newborns' hair shows how much caffeine their mothers drank during pregnancy.
7 citations,
June 2021 in “Amino acids” Human hair protein modifications could potentially indicate heart disease risk.
3 citations,
May 2022 in “Clinical endocrinology” Hair steroid measurement is an effective method to diagnose and monitor CAH in developing countries.
2 citations,
January 2023 in “Dermatology practical & conceptual” COVID-19 diagnosis is linked to new or worsening hair diseases, with stress from the pandemic likely contributing.
2 citations,
May 2022 in “Diagnostics” Vitamin D levels in hair don't match those in blood, so hair isn't a reliable indicator of Vitamin D status.