Could vitamin d levels predict COVID-19 severity? new study investigates

NCT ID NCT04394390

Completed Knowledge-focused Sponsor: Bursa City Hospital Source: ClinicalTrials.gov ↗

First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This completed study looked at whether vitamin D levels in the blood are linked to how severe COVID-19 gets. Researchers measured vitamin D in 1,100 COVID-19 patients in Turkey. The goal was to see if current vitamin D thresholds reflect real clinical risk. This is an observational study, so it can't prove that vitamin D directly affects outcomes, but it may guide future research.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: vitamin D
What this could lead to: If a clear link is found, it could point toward vitamin D levels as a factor in COVID-19 severity, potentially influencing future prevention or treatment strategies.
What could go wrong: This is an observational study, not a treatment trial. It cannot prove cause and effect, and results may not apply to other populations or settings.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

COVID-19 Infections vitamin D deficiency

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

COVID VITAMIN D DEFICIENCY

Contacts and locations

Locations

Bursa City Hospital

Bursa, Dogankoy, Turkey (Türkiye)

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