50 citations
,
November 2020 in “Physiology & behavior” This review found that patients with depression generally have higher hair cortisol concentrations compared to healthy controls, while those with PTSD tend to have lower concentrations.
3 citations
,
April 2023 in “Journal of Veterinary Internal Medicine” This study found that dogs with idiopathic epilepsy had altered hair concentrations of several trace elements, which may suggest a role in the disease's pathophysiology and indicate effects from antiseizure medications.
April 2026 in “Journal of Experimental Psychopathology” This study suggests that hair cortisol concentration may not reliably indicate psychological distress or differentiate clinical from non-clinical populations, as observed in a female PhD student over nine years.
43 citations
,
January 2016 in “International Journal of Andrology” This study found that men experiencing long-term symptoms after finasteride use for androgenetic alopecia frequently reported loss of penis sensitivity and anhedonia, among other effects, indicating potential post-finasteride syndrome.
June 2026 in “Journal of Cosmetic Dermatology” This study found that patients with frontal fibrosing alopecia had higher hair shaft concentrations of titanium, zinc, aluminum, and iron, possibly linked to the use of metal-containing products.