30 citations
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July 2004 in “Fertility and Sterility” Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.
7 citations
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November 2019 in “Animal” Melatonin increases cashmere quality in goats but reduces their milk production and doesn't affect their offspring's hair growth.
64 citations
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January 2010 in “The FASEB Journal” Prolactin affects the production of different keratins in human hair, which could lead to new treatments for skin and hair disorders.
77 citations
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June 2015 in “Nature Reviews Urology” Some common medications can harm male fertility, but many effects can be reversed.
January 2018 in “Springer eBooks” Gender affects hair and scalp characteristics, with differences in hormone responses, graying patterns, and trace metals.
