“…Clinical studies have shown that vitamin D supplementation can lower androgen levels, lower anti-Mullerian hormone (AMH) levels [ 14 , 15 ], normalize the metabolic profile, and regularize periods in women with polycystic ovarian syndrome (PCOS) [ 16 , 17 ]. In fact, low serum 25(OH)D concentrations have been linked to problems of infertility [ 18 , 19 ], endometriosis [ 20 ], polycystic ovary syndrome (PCOS) [ 16 , 17 , 21 , 22 ], as well as adverse pregnancy outcomes, including spontaneous abortions [ 23 ], gestational diabetes [ 24 , 25 ], bacterial vaginosis [ 26 ], preeclampsia [ 27 , 28 ], neonatal hypocalcemia [ 29 ], prematurity, and low birth weight [ 30 ], as well as fetal and infant growth disorders [ 31 ].…”