What is d role of vit d3 during pregnancy?

Increasing Evidence.: The vitamin d plays a key role in fertility by enhancing hormone production of estrogen and progesterone. -->a study suggests that only 7% of fertile women have normal vit d levels -->nearly 40% of anovulatory women have abnormal vit d levels -->consider vit d3 and not d2 supplementations and sitting out in sun for 10- 15 minutes a day.