COVID 19 hospitalized | |
COVID-19 severe or critically | |
Vitamins | |
vitamin C | Jamali Moghadam Siahkali Kumari Zhang |
Vitamin D | COVID-VIT-D |
5671 | Aisa-Alvarez, 2020 | 2 | 1 | 0 | excluded | risk of bias not avaialble | |
7995 | Hazan, 2021 | 2 | 32 | 0 | excluded | not a RCT | risk of bias not avaialble |