What do we know about Vitamin C and #COVID19 so far?

The role of #VitaminC goes beyond immunity-boosting & the micronutrient at high dose is crucial to prevent severity.

Making a case with 14 studies, postulating Vitamin C to be an integral part of COVID treatment.
2. A single-center observational study identified a total of 17 patients who received IV vitamin C for COVID-19 & noted a significant decrease in inflammatory markers, including ferritin and D-dimer, and a trend to decreasing FiO2 requirements. https://covid19.elsevierpure.com/en/publications/the-use-of-iv-vitamin-c-for-patients-with-covid-19-a-single-cente
3. In a research letter, Camon L et al illustrated that 17 patients (94.4%) of a cohort with ARDS had undetectable vitamin C levels and 1 patient had low levels (2.4 mg/L). The reference value is 5 mg/dl.
https://link.springer.com/content/pdf/10.1186/s13054-020-03249-y.pdf
8. An RCT with 20 critically ill patients with multiple organ dysfunction demonstrated 2 g/d dose was associated with normal plasma concentrations, and the 10 g/d dose was associated with supranormal plasma concentrations. https://pubmed.ncbi.nlm.nih.gov/29522710/ 
9. Treatment with vitamin C decreases IL-6 and blocks in vivo the release of IL-6 in the endothelium induced by endothelin-1 (ET-1) in humans.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7024758/
Prophylaxis & Prevention:

10. Feyaerts A et al proposed that Low dose (0.5–2 g/d) vitamin C may have benefits when used early in severe acute respiratory syndrome.
https://www.sciencedirect.com/science/article/pii/S0899900720302318
11. A total of 148 animal studies have indicated that a daily dose of a few grams of vitamin C may alleviate or prevent infections.
https://www.mdpi.com/2072-6643/9/4/339
12. Vitamin C is known to support various cellular functions of both the innate and adaptive immune systems, including modifying susceptibility to various viral infections and by influencing inflammation.
https://portlandpress.com/biochemsoctrans/article/46/5/1147/67650/Vitamin-C-and-immune-cell-function-in-inflammation
13. During the outbreak of SARS‐CoV‐1 in 2003, the use of vitamin C, an essential micronutrient for humans and free radical scavenger, was suggested as a nonspecific treatment for severe viral respiratory tract infections. https://academic.oup.com/jac/article/52/6/1049/731701
14. A Cochrane systematic review concludes that 1 to 2 g vitamin C per day is safe, inexpensive, and has a consistent effect on the duration and severity of the common cold. https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD000980.pub4/abstract
All this evidence makes a very strong case on why a high dosage of Vitamin C needs to be a crucial part of COVID 19. More RCTs are recommended to establish this hypothesis.
@PeterVermont @drdavidsamadi @deboraha_rd @AndrewJacksonV3 @AAPSonline please take a look at this thread and opine.
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