COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D PXPX FLVFLV PVP-IPI BUBU BHBH BLBL CICI HC QHC Q NZNZ COCO More..
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  Submit FeedbackFeedback (RCT)0.82[0.23-2.91]recov. time4850RRCITreatmentControlTau​2 = 0.00; I​2 = 0.0%Early treatment0.82[0.23-2.91]0/480/5018% improvementZhang (RCT)0.50[0.20-1.80]death6/2711/29RRCITreatmentControlPatel0.71[0.43-1.14]death22/9626/80Kumari (RCT)0.64[0.26-1.55]death7/7511/75JamaliMog.. (RCT)1.00[0.22-4.56]death3/303/30Gao0.14[0.03-0.72]death1/465/30Sulaimen0.85[0.61-1.12]death46/14259/142Hakamifard (RCT)0.54[0.14-2.08]ICU3/385/34CT​1Tau​2 = 0.00; I​2 = 0.0%Late treatment0.74[0.59-0.94]88/454120/42026% improvementBehera0.90[0.63-1.21]cases29/67157/305RRCITreatmentControlTau​2 = 0.00; I​2 = 0.0%PrEP0.90[0.63-1.21]29/67157/30510% improvementAll studies0.80[0.67-0.96]117/569277/77520% improvement9 vitamin C COVID-19 5/8/211 CT: study uses combined treatmentTau​2 = 0.00; I​2 = 0.0%; Z = 2.40 (p = 0.0082)Lower RiskIncreased Risk
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In Silico Malla et al., bioRxiv, doi:10.1101/2021.05.02.442358 (Preprint) Vitamin C inhibits SARS coronavirus-2 main protease essential for viral replication
In Vitro study showing that vitamin C inhibits SARS-CoV-2 3CLpro. Authors note that the different clinical results may be explained in part by the widely varying dosages used, and they conclude that vitamin C and/or derivatives may become..
Late Hakamifard et al., Immunopathologia Persa, doi:10.34172/ipp.2021.xx (Peer Reviewed) ICU, ↓46.3%, p=0.46 The effect of vitamin E and vitamin C in patients with COVID-19 pneumonia; a randomized controlled clinical trial
RCT with 38 patients treated with vitamin C and vitamin E, and 34 control patients, showing lower ICU admission with treatment, but not statistically significant.
Late Sulaimen et al., Research Square, doi:10.21203/ (Preprint) death, ↓14.9%, p=0.27 Ascorbic Acid as an Adjunctive Therapy in Critically Ill Patients with COVID-19: A Multicenter Propensity Score Matched Study
Retrospective 158 critically ill patients receiving vitamin C and propensity matched controls, showing mortality OR 0.77 [0.48-1.23], and statistically significantly lower thrombosis, OR 0.42 [0.18-0.94]. 1000mg of vitamin C was given dai..
Early Hemilä et al., Research Square, doi:10.21203/ (meta analysis) meta-analysis Vitamin C may increase the recovery rate of outpatient cases of SARS-CoV-2 infection by 70%: reanalysis of the COVID A to Z Randomized Clinical Trial
Reanalysis of Thomas et al. showing that vitamin C increased the recovery rate by 70%, p = 0.025.
Late Gao et al., Aging, doi:10.18632/aging.202557 (Peer Reviewed) death, ↓86.0%, p=0.04 The efficiency and safety of high-dose vitamin C in patients with COVID-19: a retrospective cohort study
Retrospective 76 COVID-19 patients, 46 treated with intravenous high-dose vitamin C, showing lower mortality and improved oxygen requirements with treatment. Dosage was 6g intravenous infusion per 12hr on the first day, and 6g once for th..
Early Thomas et al., JAMA Network Open, doi:10.1001/jamanetworkopen.2021.0369 (Peer Reviewed) recov. time, ↓17.9%, p=0.38 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
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].
Late 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
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.
Late Xing et al., Journal of Pharmaceutical and Biomedical Analysis, doi:10.1016/j.jpba.2021.113927 (Peer Reviewed) Vitamin C supplementation is necessary for patients with coronavirus disease: An ultra-high-performance liquid chromatography-tandem mass spectrometry finding
Prospective study with 31 COVID-19 patients and 60 controls reporting on a new method to assess plasma vitamin C concentrations. Vitamin C was deficient (11.4µmol/l vs. 52µmol/l for healthy controls), and returned to a normal range (76µmo..
Late JamaliMoghadamSiahkali et al., Research Square, doi:10.21203/ (Preprint) death, 0.0%, p=1.00 Safety and Effectiveness of High-Dose Vitamin C in Patients with COVID-19; A Randomized Controlled open-label Clinical Trial
Small late stage RCT for the addition of vitamin C to HCQ and lopinavir/ritonavir, with 30 treatment and 30 control patients, finding a significant reduction in temperature and a significant improvement in oxygenation after 3 days in the ..
Review Holford et al., Nutrients, doi:10.3390/nu12123760 (Review) (Peer Reviewed) review Vitamin C—An Adjunctive Therapy for Respiratory Infection, Sepsis and COVID-19
Review of vitamin C use for respiratory infections including COVID-19 and the mechanisms of action. Authors note that evidence to date indicates oral vitamin C (2–8 g/day) may reduce the incidence and duration of respiratory infections, a..
Late Kumari et al., Cureus 12(11): e11779, doi:10.7759/cureus.11779 (Peer Reviewed) death, ↓36.4%, p=0.45 The Role of Vitamin C as Adjuvant Therapy in COVID-19
RCT 150 hospitalized patients in Pakistan showing 26% faster recovery, p < 0.0001. 36% lower mortality, not statistically significant due to the small number of events. Dosage was 50 mg/kg/day of intravenous vitamin C.
PrEP Behera et al., PLoS ONE, doi:10.1371/journal.pone.0247163 (preprint 11/3) (Peer Reviewed) cases, ↓9.6%, p=0.58 Role of ivermectin in the prevention of SARS-CoV-2 infection among healthcare workers in India: A matched case-control study
Retrospective matched case-control prophylaxis study for HCQ, ivermectin, and vitamin C with 372 healthcare workers, showing lower COVID-19 incidence for all treatments, with statistical significance reached for ivermectin. HCQ OR 0.56, ..
Late Patel et al., Chest Infections, doi:10.1016/j.chest.2020.08.322 (Peer Reviewed) death, ↓29.5%, p=0.18 The significance of oral ascorbic acid in patients with COVID-19
Retrospective 176 hospitalized patients, 96 treated with oral vitamin C (from 500mg to 1500mg daily), showing lower mortality with treatment.
Levels Arvinte et al., Med. Drug Discov, doi:10.1016/j.medidd.2020.100064 (Peer Reviewed) Serum Levels of Vitamin C and Vitamin D in a Cohort of Critically Ill COVID-19 Patients of a North American Community Hospital Intensive Care Unit in May 2020: A Pilot Study
Pilot study with 21 ICU patients finding low serum levels of vitamin C and vitamin D in most patients. Older age and low vitamin C level appeared to be co-dependent risk factors for mortality.
Levels Chiscano-Camón et al., Critical Care, doi:10.1186/s13054-020-03249-y (Peer Reviewed) Vitamin C levels in patients with SARS-CoV-2-associated acute respiratory distress syndrome
Small study of 18 COVID-19 ARDS patients showing that vitamin C levels were very low - 17 patients had undetectable levels and one had a low level (2.4 mg/L).
Late Zhang et al., Research Square, doi:10.21203/ (Preprint) death, ↓50.0%, p=0.31 Pilot Trial of High-dose vitamin C in critically ill COVID-19 patients
Small RCT for high dose vitamin C for ICU patients showing reduced (but not statistically significant) mortality. Dosage was 12g of vitamin C/50ml every 12 hours for 7 days at a rate of 12ml/hour.
Late Hiedra et al., Expert Review of Anti-infective Therapy, doi:10.1080/14787210.2020.1794819 (Peer Reviewed) The use of IV vitamin C for patients with COVID-19: a case series
Case study of 17 patients receiving IV vitamin C for COVID-19, finding a significant decrease in inflammatory markers, including ferritin and D-dimer, and a trend to decreasing FiO2 requirements, after vitamin C administration. There was ..
Review Feyaerts et al., Nutrition, doi:10.1016/j.nut.2020.110948 (Review) (Peer Reviewed) review Vitamin C as prophylaxis and adjunctive medical treatment for COVID-19?
Review concluding that there is clear evidence that vitamin C in high doses can reduce interleukin-6 and endothelin-1 mediators. Authors suggest a relatively low dose as prophylaxis, and in cases of severe COVID-19, an (intravenous) high-..
In Silico Kumar et al., VirusDisease, doi:10.1007/s13337-020-00643-6 (preprint 5/27) (Peer Reviewed) In silico virtual screening-based study of nutraceuticals predicts the therapeutic potentials of folic acid and its derivatives against COVID-19
In Silico analysis finding that magnesium ascorbate, a form of Vitamin C, was found to be the top compound among 106 nutraceuticals for binding to Mpro of SARS-CoV-2.
Please send us corrections, updates, or comments. Vaccines and treatments are both extremely valuable and complementary; multiple approaches are required to cover all people and all existing and future variants. We do not provide medical advice. Before taking any medication, consult a qualified physician who can provide personalized advice and details of risks and benefits based on your medical history and situation. Treatment protocols for physicians are available from the FLCCC.
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