In particular, according to this metanalysis, the relationship between vitamin D supplementation and serum AMH concentrations seems to depend on the ovulatory status of the patient: while AMH levels significatively increased following vitamin D supplementation in ovulatory women without PCOS, they significantly decreased following supplementation in PCOS women, maybe reflecting the ability of vitamin D to improve folliculogenesis in PCOS. Here, AMH is linked to polycystic ovary syndrome.