Women who consume high levels of vitamin A may be at a higher risk of osteoporosis, implies a study published in last week's Journal of the American Medical Association (JAMA). The study, which was part-financed by pharmaceuticals and vitamin producer Hoffman La Roche, found a link between hip fractures and intake (both from food and dietary supplements) of the basic form of vitamin A in excess of 6,600 international units (IU) per day. As explained in an article in the Washington Post, most multivitamins have 5,000 IU of A, but some is derived from beta carotene, which the body converts into vitamin A. The research found no effect on bone health from vitamin A derived from beta carotene.