- Zinc, vitamin D, and vitamin C don’t prevent severe COVID-19: study Business Insider
- COVID-19: Vitamin D deficiency may increase severity Medical News Today
- Vitamins ineffective at reducing COVID-19 mortality – study The Jerusalem Post
- Immune-boosting supplements do not reduce the risk of death due to Covid-19: study Hindustan Times
- Immune-boosting supplements do not lessen risk of death from COVID-19, review finds News-Medical.Net
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