May 2013 in “DOAJ (DOAJ: Directory of Open Access Journals)” This study found that women with hair loss had significantly higher free testosterone levels compared to those without hair loss.
115 citations
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August 2008 in “The Journal of Clinical Endocrinology & Metabolism” In this study, T3 and T4 were found to directly influence human hair follicles in vitro, enhancing keratinocyte proliferation, prolonging the hair growth phase, and affecting pigmentation.
95 citations
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August 2013 in “Journal of Investigative Dermatology” HPT axis hormones boost mitochondrial function and growth in hair follicles, potentially aiding hair health.
42 citations
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July 2010 in “European Journal of Cell Biology” This study found that thyroid hormones T3 and T4 enhance keratin 15 promoter activity and stimulate CD200 expression in epithelial stem cells from human scalp hair follicles, affecting their growth and differentiation.
32 citations
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March 2021 in “Journal of endocrinological investigation” This review covers the connection between thyroid diseases and skin conditions like alopecia, dermatitis, and vitiligo, and highlights the need for further research on the role of thyroid hormones in skin health.