This article is a study that compares a treatment including high dose vitamin C versus standard therapy. The results show that the group of patients having vitamin C had a reduced mortality at the mark of 28 days after initiation of therapy.
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Gao Dengfeng, Ming Xu, Gang Wang, et al. “The efficiency and safety of high-dose vitamin C in patients with COVID-19: a retrospective cohort study." Aging (Albany NY) 13, 5 (2021): 7020-7034. https://doi.org/10.18632/aging.202557