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All Studies   Meta Analysis   Recent: 
0 0.5 1 1.5 2+ Severe case 4% unadjusted Improvement Relative Risk c19vitaminc.com Shehab et al. Vitamin C for COVID-19 Prophylaxis Favors vitamin C Favors control
Shehab, 253 patient vitamin C prophylaxis study: 4% lower severe cases [p=1] https://c19p.org/shehabc
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Immune-boosting effect of natural remedies and supplements on progress of, and recovery from COVID-19 infection
Shehab et al., Tropical Journal of Pharmaceutical Research, doi:10.4314/tjpr.v21i2.13
28 Feb 2022    Source   PDF   Share   Tweet
Retrospective survey-based analysis of 349 COVID-19 patients, showing no significant difference with vitamin C prophylaxis in unadjusted analysis. REC/UG/2020/03.
risk of severe case, 4.3% lower, RR 0.96, p = 1.00, treatment 14 of 139 (10.1%), control 12 of 114 (10.5%), NNT 220, unadjusted, severe vs. mild cases.
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
This study is excluded in the after exclusion results of meta analysis: unadjusted results with no group details.
Shehab et al., 2/28/2022, retrospective, multiple countries, multiple regions, peer-reviewed, survey, 7 authors, study period September 2020 - March 2021.
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