Welcome to the VITAL Study
Welcome to the Web site of the VITamin D and OmegA-3 TriaL (VITAL) at Brigham and Women’s Hospital, an affiliate of Harvard Medical School, in Boston, Massachusetts. VITAL is an ongoing research study in 25,871 men and women across the U.S. investigating whether taking
daily dietary supplements of vitamin D3 (2000 IU) or omega-3 fatty acids (Omacor® fish oil, 1 gram) reduces the risk for developing cancer, heart disease, and stroke in people who do not have a prior history of these illnesses. Please click on Study Q&A to learn more about this important research endeavor.
The website is updated regularly to 
keep participants informed about the study’s progress, as well as health topics that we hope are of interest.
We also answer frequently asked questions from participants on this website.
Thank you for your interest!
JoAnn Manson, MD, DrPH
I-Min Lee, MBBS, ScD
VITAL Study Directors