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.
Hair hormone levels can indicate stress after a medically indicated abortion.
Hair and nails can show hormone changes during puberty in dogs.
1 citations
,
October 2023 in “PloS one” Cosmetic hair treatments can increase hair testosterone levels, while natural hair color does not affect it.
12 citations
,
March 2000 in “Clinical Chemistry” Chronic DHEA supplementation slightly increases testosterone in hair but stays within safe limits.
May 2026 in “Psychoneuroendocrinology” January 2026 in “SSRN Electronic Journal”
October 2022 in “Linköping University medical dissertations” The method shows hair testosterone levels reflect those in saliva, but are affected by various factors and may indicate a risk for heart attack.
12 citations
,
December 2020 in “Comprehensive psychoneuroendocrinology” Hormone levels in hair change during pregnancy, with progesterone increasing significantly compared to non-pregnant women.
12 citations
,
February 2020 in “The Journal of Clinical Endocrinology & Metabolism” More body hair in young Australian women is linked to higher androstenedione levels.
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.
18 citations
,
May 1992 in “American Journal of Biological Anthropology” Higher androgen levels do not cause baldness in men.
May 2023 in “Animal Reproduction Update” High levels of cortisol in hair show long-term stress which can lower fertility in animals.
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.
30 citations
,
April 2011 in “Rapid communications in mass spectrometry/RCM. Rapid communications in mass spectrometry” Analyzing hair with this method can help understand and monitor scalp conditions and treatment effects.
January 2024 in “Biomedicines” Using stem cells from hair follicles to treat female hair loss is safe and effective after six months.
May 2022 in “Research Square (Research Square)” Melatonin improved sheep reproduction, being more beneficial and cost-effective in males.
September 2023 in “Clinical, Cosmetic and Investigational Dermatology” Higher SHBG levels are linked to less severe hair loss in women, but vitamin D levels don't seem to affect hair loss.
15 citations
,
March 1997 in “International Journal of Dermatology” Finasteride shows promise for treating hair loss and excessive hair growth, but more research is needed to confirm its effectiveness and safety.
September 2023 in “Scientific reports” Segmental hair analysis can track testosterone over time but needs adjustments for sex, hair color, and washing frequency.
May 2021 in “Journal of the Endocrine Society” Adolescents with PCOS have higher levels of certain androgens, which are linked to hair growth but don't help diagnose PCOS better than testosterone levels.
12 citations
,
December 2017 in “Scientific reports” The new test can measure very small amounts of testosterone in hair, and grinding the hair up first gives more accurate results.
November 2024 in “Psychoneuroendocrinology” Testosterone increases hair testosterone levels, stress raises hair cortisol, and relationship status affects hormone levels.
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.
36 citations
,
March 2007 in “Journal of Chromatography B” Hair analysis can detect testosterone in horses after drug administration.
May 2023 in “International journal of pharmaceutical sciences and medicine” Sunflower oil was found to promote hair growth in mice with hormone-induced hair loss.
22 citations
,
July 1990 in “Acta Dermato Venereologica” High levels of testosterone and dihydrotestosterone inhibit hair cell growth, while high levels of estradiol promote it.
114 citations
,
January 2007 in “International Journal of Dermatology” Caffeine can stimulate hair growth and counteract testosterone's suppressive effects on hair follicles.
27 citations
,
February 2017 in “Biomedicine & Pharmacotherapy” White wax and policosanol from white wax effectively reduced hair loss and promoted hair growth in mice better than a known hair growth drug.
10 citations
,
November 2018 in “Developmental Psychobiology” Hair can effectively measure DHEA and testosterone levels in children.