3 citations,
November 2015 in “Journal of Investigative Dermatology” Testosterone can both promote hair growth and cause baldness by affecting hair growth signals.
8 citations,
July 2012 in “Cambridge University Press eBooks” Androgens can both increase body hair and cause scalp hair loss.
July 2010 in “British Journal of Dermatology” Hair loss in women may have multiple causes, and eyebrow regrowth possible with specific injections.
159 citations,
July 2006 in “Endocrine Reviews” Estrogens significantly influence hair growth by interacting with receptors in hair follicles and may help regulate the hair growth cycle.
165 citations,
December 2002 in “Molecular and Cellular Endocrinology” Male hormones, particularly DHT, are linked to male pattern hair loss, and treatments like finasteride can help, but they don't work for postmenopausal women's hair loss, which may have different causes.