How much extra vitamin d iu can i take during pregnancy in addition to my prenatals? i am low.

Vitamin D: With limited information available as to what you current vitamin D level is and what other supplements or multivitamins you are taking it is not possible to make individual recommendations. Your Obs- Gyn doc or primary care should be best to weigh in, having access to above information. Make sure they have a full list of all drugs you take, including vitamins/ supplements.

Total 4000 units: Keep your total intake to below 4000 units of vitamin D3/day. A total of 2000 units/day should be sufficient. Wish you good health and a healthy baby!