AMH and vitamin D deficiency: Another cross-sectional study by Shapiro et al. was performed on 457 infertile US women with a high prevalence of diminished ovarian reserve, showing that AMH and FSH levels did not vary between women with vitamin D deficiency and those with normal levels (0.8 ± 3.0 vs. 0.5 ± 1.6 ng/mL (p = 0.18) and 9.4 ± 7.2 vs. 9.2 ± 9.5 mIU/mL (p = 0.54), respectively) [57].