Serum caffeine and paraxanthine concentrations and menstrual cycle function: correlations with beverage intakes and associations with race, reproductive hormones, and anovulation in the BioCycle Study.
Karen C SchliepEnrique F SchistermanJean Wactawski-WendeNeil J PerkinsRose G RadinShvetha M ZarekEmily M MitchellLindsey A SjaardaSunni L MumfordPublished in: The American journal of clinical nutrition (2016)
Caffeine intake, irrespective of the beverage source, may be associated with reduced testosterone and improved menstrual cycle function in healthy premenopausal women.