Calcium and Vitamin D are fine to take during pregnancy. You will need other vitamins like folic acid... please discuss with your doctor.
Cholecalciferol (vitamin D3) has not been officially assigned to a pregnancy category. When used within the recommended daily allowance for pregnant women, cholecalciferol is considered to be safe. The recommended daily allowance of cholecalciferol in pregnant women is 400 to 600 intl units.
Supplementation of vitamin D during the third trimester with vitamin D2 or vitamin D3 has been studied. Dosages of 1000 intl units per day given daily during the third trimester did not result in any adverse fetal outcome. Neonatal calcium homeostasis was affected, resulting in significantly higher concentrations of calcium, 25-OH vitamin D3, and 1,25-(OH)2 vitamin D3. Earlier literature expressed concerns over the development of supravalvular aortic stenosis, craniofacial abnormalities, and dental abnormalities in infants and children with idiopathic hypercalcemia. Whether or not prenatal factors predisposed these children to the development of hypercalcemia is not known. Fifteen hypoparathyroid women receiving 50,000 to 250,000 intl units of vitamin D2 experienced 27 uneventful births. No cardiovascular or craniofacial abnormalities were reported.
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