A major trial found that high-dose vitamin D did not make COVID-19 infections less severe. However, researchers spotted a possible signal that the supplement may reduce the chances of developing long COVID. Credit: Shutterstock Findings from a large study led by Mass General Brigham suggest scientists should continue investigating whether vitamin D supplements could influence long COVID. The research showed that taking high doses of vitamin D3 did not make COVID-19 infections less severe, but

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