US recommendations fail to correct vitamin D deficiency

Vitamin D deficiency is widespread among women with breast cancer. guidelines currently recommend daily supplementation with 400 IU vitamin D(3); however, attainment of a circulating level of 25-hydroxyvitamin D defined as sufficient (that is, >= 75 nmol/l) might not be possible with this level of supplementation, according to data published in the Journal of Clinical Oncology.