| COVID 19 hospitalized | |
| COVID-19 severe or critically | |
| Vitamins | |
| vitamin C | Jamali Moghadam Siahkali Kumari Zhang |
| Vitamin D | COVID-VIT-D |
| 6123 | Annweiler (GERIA-COVID; regular intake of bolus vitamin D), 2020 | 1 | 13 | 0 | not a RCT | risk of bias not avaialble | |
| 6149 | Annweiler (GERIA-COVID; Vitamin D Supplementation After COVID-19 Diagnosis), 2020 | 1 | 13 | 0 | not a RCT | risk of bias not avaialble | |
| 6381 | Espitia-Hernandez, 2020 | 1 | 31 | 0 | not a RCT | risk of bias not avaialble | |
| 6381 | Espitia-Hernandez, 2020 | 1 | 31 | 0 | not a RCT | risk of bias not avaialble | |
| 7995 | Hazan, 2021 | 2 | 32 | 0 | excluded | not a RCT | risk of bias not avaialble |
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