COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PVP-IPVP-I FLVFLV REGNR2 LY-CoVLY RemdesivirRMD
Vitamin C study #7 of 7
2/12 Early treatment study
Thomas et al., JAMA Network Open, doi:10.1001/jamanetworkopen.2021.0369 (Peer Reviewed)
Effect of High-Dose Zinc and Ascorbic Acid Supplementation vs Usual Care on Symptom Length and Reduction Among Ambulatory Patients With SARS-CoV-2 Infection: The COVID A to Z Randomized Clinical Trial
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Small 214 low-risk outpatient RCT showing non-statistically significant faster recovery with zinc and with vitamin C. NCT04342728.
A secondary analysis concludes that vitamin C increases recovery rate by 71% (p = 0.036) [1]. See also [2].

Thomas et al., 2/12/2021, Randomized Controlled Trial, USA, North America, peer-reviewed, 11 authors.
recovery time, 17.9% lower, relative time 0.82, p = 0.38, treatment 48, control 50, mean time to a 50% reduction in symptoms, p value approximated with combined p value in study.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.
Details of all 7 studies
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