Like many vitamins, vitamin D is versatile. It has long been
associated with bone development, but severe deficiency can result in
diseases, such as rickets. Recent studies found some correlation between
vitamin D levels and cardiovascular health, the development of multiple
sclerosis, tuberculosis infection and now pre-menopausal breast cancer.
Researchers at the San Diego School of Medicine of the University of
California have found that low levels of serum (blood) vitamin D are
associated with a crucial period of tumor formation for breast cancer.