Low Vitamin D Levels Tied To Odds For Severe Covid -

: Recent research from 2025 and 2026 suggests that low vitamin D levels may also contribute to the development of long COVID . Deficient patients were reportedly 5.8 times more likely to experience persistent symptoms such as fatigue and brain fog months after their initial recovery. Biological Mechanisms

Vitamin D is believed to modulate the immune system through several pathways: Vitamin D and COVID-19: Clinical Evidence and ... - PMC Low Vitamin D Levels Tied to Odds for Severe COVID

: Patients with vitamin D deficiency were found to be up to 14 times more likely to have a severe or fatal disease course in some observational studies. : Recent research from 2025 and 2026 suggests

: Meta-analyses indicate that low vitamin D status increases the risk of ICU admission by more than twofold and the risk of death by 1.22- to 4.15-fold. In a large study, mortality among deficient patients was 25.6%, compared to just 2.3% for those with sufficient levels. - PMC : Patients with vitamin D deficiency