I am confused about vitamin D. I have been taking it for years, along with calcium, to protect my bones. Recently, I read that there is no evidence it works and that too much could be harmful. Can you ...

A major clinical trial has delivered an unexpected twist in the search for ways to fight COVID-19 and its lingering effects. Researchers at Mass General Brigham found that taking high doses of vitamin ...

Overdoing it on this popular supplement can lead to a host of serious health issues, which one man learned the hard way. Per a study published in the journal BMJ Case Reports, the unidentified ...

Vitamin D is an essential nutrient for your immune system, heart health, and more. However, most Americans don't get enough ...

In a large, randomized trial, researchers at Mass General Brigham have found that high-dose vitamin D3 did not reduce COVID-19 infection severity, but may impact long COVID outcomes.

Researchers are still trying to understand why some people develop Long COVID: lasting symptoms of the disease that can ...

Vitamin D didn’t blunt COVID’s initial impact—but it may hold a surprising clue in the fight against long COVID.

In a large, randomized trial, researchers at Mass General Brigham found that high-dose vitamin D3 did not reduce COVID-19 ...