In 2009, IV vitamin C was shown to be a potentially life-saving treatment against severe swine flu. Even before that, many studies had demonstrated the usefulness of vitamin C against infections of various kinds.
For example, a randomized double-blind study15 published in 1994 found elderly patients given 200 milligrams of vitamin C per day while hospitalized for acute respiratory infection fared significantly better than those receiving a placebo. Now, vitamin C will be put to the test against coronavirus as well. The study,16 “Vitamin C Infusion for the Treatment of Severe 2019-nCoV Infected Pneumonia” was posted to ClinicalTrials.gov on February 11, 2020, and has not yet started recruiting patients. According to the study description:
“At the end of 2019, patients with unexplained pneumonia appeared in Wuhan, China … Subsequently, the World Health Organization officially named the new coronavirus that caused the pneumonia epidemic in Wuhan as 2019 new coronavirus (2019-nCoV), and the pneumonia was named severe acute respiratory infection.