demonstrated suggested inconclusive safety concern ongoing study display ongoing demontrated benefit only observational study
COVID 19 hospitalized
COVID-19 severe or critically
Vitamins
vitamin C Jamali Moghadam Siahkali Kumari Zhang
Vitamin D COVID-VIT-D

2 studies excluded by filtering options 2

5671 Aisa-Alvarez, 2020 210excludedrisk of bias not avaialble
7995 Hazan, 2021 2320excludednot a RCTrisk of bias not avaialble