Dietary Reference Intakes for Vitamin D Caution Against Excess

"What we have concluded may be surprising to some," Dr. Ross said. "I was surprised to find that vitamin D requirements don't vary much by age."

Dr. Ross noted that the report is not necessarily the last word on the subject, but "we are going to need to do a tremendous amount of research" before drawing any conclusions on additional benefits of vitamin D and calcium.

The study was sponsored by the federal governments of the United States and Canad