Vitamin D Reduces Long COVID Symptoms
Analysis based on 8 articles · First reported Mar 12, 2026 · Last updated Mar 18, 2026
The study's findings on Vitamin D's potential to reduce long COVID symptoms could boost demand for Vitamin D supplements, positively impacting companies in the nutraceutical and pharmaceutical industries. While not a direct cure for COVID-19, the focus on long COVID offers a new market segment for preventative and supportive health products.
A study published in Journal of Nutrition, co-authored by JoAnn E. Manson of Mass General Brigham, found that high-dose Vitamin D3 supplementation may reduce the risk of developing long COVID symptoms. The study, conducted on 1,747 adults in the United States and Mongolia, showed that participants taking Vitamin D3 were less likely to report persistent symptoms eight weeks after COVID-19 infection compared to a placebo group. However, Vitamin D3 did not reduce the severity of initial COVID-19 infections or hospitalization rates. The findings suggest a promising signal for Vitamin D's role in long COVID, warranting further research. Other supplements like Omega−3 fatty acids (proposed by DSM-Firmenich) and a combination of Vitamin D3 and Vitamin K2 MK-7 (with Balchem Corporation's K2Vital MCT) have also been explored for their potential in managing post-COVID symptoms.
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