Every week, it seems, brings new evidence linking vitamin D to health. The latest: Low D levels are associated with muscle weakness. Another recent study found that more than half of a group of HIV-positive men in New York City had too-low levels of D. A simple blood test can determine your vitamin D level. Many docs suggest at least 1,000 IU daily. If your level is low, a supplement may be a must-swallow.
November 1, 2009