Doctors and researchers discuss the benefits and risks of vitamin D and why some Americans may not be getting enough of it.


  • Joan Lappe professor of nursing and medicine at the Creighton University School of Medicine and investigator with Creighton's Osteoporosis Research Center.
  • Joan McGowan Director, Musculoskeletal Diseases Branch and the Bone Diseases Program at the National Institute of Arthritis and Musculoskeletal and Skin Diseases.
  • Paul Coates Director, Office of Dietary Supplements, National Institutes of Health

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