Adequacy of current supplements For pregnant or lactating women, the IOM (2011) established 600 IU of vitamin D per day as adequate Currently, most prenatal vitamins only contain 400 IU of vitamin D, so this might not be enough vitamin D in prenatal vitamins. In one study of healthy women the majority were taking a daily prenatal vitamin, but 50% of the women and 65% of their newborns were vitamin D deficient (25[OHD 12 ng/ml) at birth (Lee et al., 2007). In addition, in a study of high-dose vitamin D supplements in lactating women, Hollis and Wagner (2004) found a maternal intake of 4000 day was required to provide adequate vitamin D for both mothers and their breastfed infants, approximately 6.5 times the IOM's recommendation. These findings suggest an implication for policy, which would be to in crease the recommended amount of vitamin D in prenatal vitamins