
JoAnn Manson, MD, shares findings from the VIVID trial on vitamin D, the timing of use, and its potential to reduce long COVID risk and symptom severity.

JoAnn E. Manson, MD, MPH, DrPH, is a professor of medicine and the Michael and Lee Bell Professor of Women’s Health at Harvard Medical School, a physician at Brigham and Women’s Hospital, and a professor of epidemiology at the Harvard T.H. Chan School of Public Health.

JoAnn Manson, MD, shares findings from the VIVID trial on vitamin D, the timing of use, and its potential to reduce long COVID risk and symptom severity.

A study suggests vitamin D may reduce long COVID symptoms at 8 weeks, although larger trials are needed to confirm benefits and optimal timing, explains JoAnn E. Manson, MD, MPH, DrPH.

March 27th 2026