The odds of severe endometriosis were 2.17 (95% CI: 0.14–33.80) for vitamin D insufficiency and 4.33 (95% CI: 0.24–115.67) for deficiency compared with normal vitamin D. Conclusions: There was no statistically significant association between vitamin D levels and endometriosis and VDR. Here, VDR is linked to hyperinsulinemic hypoglycemia, familial, 4.