Segmental Hair Analysis as a Retrospective Testosterone Diary: Possibilities and Pitfalls

September 2023 in “ Scientific reports ”

Julia K. Preinbergs, Jakob O. Ström, Elvar Theodorsson, Edvin Ingberg

testosterone segmental hair analysis hair growth rates biological sex natural hair color

Studysummary This study observed that testosterone concentrations in hair segments show some stability over time, but are influenced by factors like sebum integration, hair washing frequency, and individual hair growth rates.

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research Endogenous Steroid Hormones in Hair: Investigations on Different Hair Types, Pigmentation Effects, and Correlation to Nails

42 citations , December 2019 in “Steroids”

In this study, researchers developed a method to measure steroid hormones in hair and found that body hair typically contains higher levels of cortisone and testosterone compared to scalp hair, but hair pigmentation did not affect hormone concentrations significantly.

research Radiolabel Validation of Cortisol in the Hair of Rhesus Monkeys

50 citations , July 2018 in “Psychoneuroendocrinology”

In this study, researchers found that tritiated cortisol was incorporated into the hair of rhesus monkeys primarily as cortisol and cortisone, as well as other metabolites, after systemic administration.

Testosterone-Like Immunoreactivity in Hair Measured in Minute Sample Amounts: A Competitive Radioimmunoassay with an Adequate Limit of Detection

research Testosterone-Like Immunoreactivity in Hair Measured in Minute Sample Amounts: A Competitive Radioimmunoassay with an Adequate Limit of Detection

12 citations , December 2017 in “Scientific reports”

This study reported that pulverizing hair samples significantly improves the precision of testosterone measurement, with higher testosterone concentrations observed in men than in women.

research Determinants of Hair Cortisol and Hair Cortisone Concentrations in Adults

157 citations , June 2015 in “Psychoneuroendocrinology”

This study observed that hair cortisol and cortisone concentrations were higher in older individuals and those with diabetes mellitus, highlighting their potential significance for assessing somatic health.

Hair as a Retrospective Calendar of Cortisol Production—Increased Cortisol Incorporation into Hair in the Third Trimester of Pregnancy

research Hair as a Retrospective Calendar of Cortisol Production—Increased Cortisol Incorporation into Hair in the Third Trimester of Pregnancy

501 citations , October 2008 in “Psychoneuroendocrinology”

This study suggests that cortisol measured in human hair can effectively reflect increased production for up to six months, but its retrospective accuracy may be limited due to rapid decline in levels.

research Sexual Hormones in Human Skin

305 citations , February 2007 in “Hormone and metabolic research”

This review discusses the roles of androgens and estrogens in skin functions and disorders, and highlights the use of estrogen-progestin treatments and anti-androgens in managing hirsutism and acne, without reporting new results.

research Characteristic Features of Japanese Women's Hair With Aging and Hair Loss

76 citations , December 2006 in “Journal of Dermatological Science”

This study observed that Japanese women experience diffuse central hair loss after age 40, characterized by reduced hair density and thicker hair ratio rather than vellus-like hairs.

research Diversity of Hair Growth Profiles

115 citations , September 2005 in “International Journal of Dermatology”

Different ethnic groups have unique hair growth patterns, with African hair growing slower and less dense, Asian hair growing fast but sparse, and Caucasian hair being densest; men are more likely to experience hair loss than women.

research A Discourse on Human Hair Fibers and Reflections on the Conservation of Drug Molecules

47 citations , June 1996 in “International Journal of Legal Medicine”

This article discusses how drug molecules integrate into hair fibers, focusing on biological transport mechanisms and physicochemical factors, but reports no new experimental findings.