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Vitamin C study #11 of 13
2/1 Late treatment study
Zhao et al., Ann. Palliat. Med., doi:10.21037/apm-20-1387 (Peer Reviewed)
Beneficial aspects of high dose intravenous vitamin C on patients with COVID-19 pneumonia in severe condition: a retrospective case series study
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Retrospective case study of 12 severe/critical COVID-19 patients finding that high dose IV vitamin C improved inflammatory response, immune and organ function. There was no control group.

Zhao et al., 2/1/2021, peer-reviewed, 14 authors.
Details of all 13 studies
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