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Vitamin D and COVID-19-Revisited.

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Summary
This summary is machine-generated.

Vitamin D deficiency is common, especially in winter or with less sun exposure. While linked to increased COVID-19 severity, vitamin D supplementation

Keywords:
COVID-19vitamin D

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Area of Science:

  • Endocrinology
  • Immunology
  • Nutritional Science

Background:

  • Vitamin D (activated to 1,25-dihydroxyvitamin D) is a steroid hormone regulating numerous genes, including immune responses.
  • Vitamin D deficiency (25-hydroxyvitamin D) is prevalent in temperate climates, with less sun exposure, and darker skin.
  • Pre-COVID-19 studies indicated modest reductions in upper respiratory infections with vitamin D supplementation.

Purpose of the Study:

  • To investigate the association between vitamin D status and COVID-19 risk and severity.
  • To evaluate the effectiveness of vitamin D supplementation in mitigating COVID-19 outcomes.

Main Methods:

  • Review of studies examining serum 25-hydroxyvitamin D levels in COVID-19 patients.
  • Analysis of pre-COVID-19 research on vitamin D supplementation and respiratory infections.
  • Assessment of interventional studies on vitamin D supplementation for COVID-19.

Main Results:

  • A majority of studies show an association between vitamin D deficiency and increased COVID-19 risk or severity.
  • Vitamin D deficiency risk factors (darker skin, obesity, reduced UV exposure) overlap with severe COVID-19 risk factors.
  • Interventional studies on vitamin D supplementation for COVID-19 have yielded inconclusive results.

Conclusions:

  • A significant role for vitamin D deficiency in determining COVID-19 risk remains plausible but unproven.
  • Current supplementation strategies, including high-dose boluses, may not be effective.
  • Further research is needed to clarify the impact of vitamin D status and supplementation on COVID-19.