April 2022 in “UNESP Institutional Repository (São Paulo State University)” Using both topical minoxidil and oral biotin together significantly boosts hair growth and density.
April 2024 in “Anais brasileiros de dermatologia/Anais Brasileiros de Dermatologia” Using both minoxidil and biotin together increased hair growth more than using either one alone.
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August 2002 in “European journal of endocrinology” Metformin improves hair growth and menstrual frequency in women with PCOS and hirsutism.
February 2020 in “VSNU Open Access deal” Hair cortisol levels change with age, starting high at birth, decreasing until age 6, then rising to adult levels by age 18.
October 1988 in “Pediatric research” Certain maturity signs appear before and after the first release of sperm in boys.