TLDR Monkey hair cortisol levels are not affected by how fast their hair grows.
The study "Are hair cortisol levels dependent on hair growth rate? A pilot study in rhesus macaques" investigated the relationship between hair cortisol concentrations (HCCs) and hair growth rate in both non-stressed and stressed rhesus macaques. The study found that HCCs were not significantly correlated with hair growth rate over a 3-month period in either adult or infant rhesus macaques. This suggests that higher HCCs within the non-stress range do not result from cortisol-mediated inhibition of hair growth. However, the study concludes that it remains unknown whether hair HCCs are dependent on altered hair growth rates under stress conditions. The study involved a total of 36 macaques (18 adults and 18 infants).
77 citations,
March 2021 in “Nature” Stress hormone corticosterone blocks a growth factor to slow down hair stem cell activity and hair growth.
9 citations,
June 2020 in “BMC Molecular and Cell Biology” Stress hormone CRF can cause hair loss by affecting hair growth cells and hormones.
44 citations,
November 2018 in “Journal of applied ecology” Hair analysis for stress and reproductive hormones in wildlife needs more research for accuracy across species.
159 citations,
December 2007 in “American Journal of Pathology” Stress-related substance P may lead to hair loss and negatively affect hair growth.
162 citations,
August 2004 in “Journal of Investigative Dermatology” Hair loss causes stress and affects mental health; treatment and support needed.
194 citations,
March 2003 in “American Journal of Pathology” Stress stops hair growth in mice by causing early hair growth phase end and harmful inflammation through a specific nerve-related pathway.
April 2022 in “Journal of Cosmetic Dermatology” Trimax-360 Serum, when used for 98 days, safely and effectively improves hair growth, thickness, and density without any side effects.
5 citations,
October 2018 in “Burns” Most patients who had scalp skin removed for burns as children had normal hair growth and were satisfied years later.
46 citations,
December 2003 in “Advances in neonatal care” Assessing newborn scalp hair can reveal important health information.
