ArticleMedicine in drug discovery2020
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.
Article in Medicine in drug discovery, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 73 papers, 9 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
73 citing papers in PubMed, 9 syntheses or guidelines pooled it, 129 citations in OpenAlex.
- Efficacy of vitamin C in COVID-19 management: a systematic review and meta-analysis.BMC infectious diseases · 2025Pooled it
- The Association Between Antioxidants and COVID-19 Outcomes: a Systematic Review on Observational Studies.Biological trace element research · 2023Pooled it
- Vitamins C and D and COVID-19 Susceptibility, Severity and Progression: An Evidence Based Systematic Review.Medicina (Kaunas, Lithuania) · 2022Pooled it
- The role of vitamin D in the age of COVID-19: A systematic review and meta-analysis.International journal of clinical practice · 2021Pooled it
- Association of Vitamin D Status with SARS-CoV-2 Infection or COVID-19 Severity: A Systematic Review and Meta-analysis.Advances in nutrition (Bethesda, Md.) · 2021Pooled it
- Factors associated with mortality in patients with COVID-19 admitted to intensive care: a systematic review and meta-analysis.Anaesthesia · 2021Pooled it
- The link between COVID-19 and VItamin D (VIVID): A systematic review and meta-analysis.Metabolism: clinical and experimental · 2021Pooled it
- Pooled it
- Vitamin D Status and SARS-CoV-2 Infection and COVID-19 Clinical Outcomes.Frontiers in public health · 2021Pooled it
- Trial
- Vitamin D and COVID-19: Inmunomodulatory Effects and the Mexican Public Health Perspectives.International journal of molecular sciences · 2026Review
- Vitamins impacting mental/physical well-being during viral pandemics: a mechanistic review based on COVID-19: a comprehensive review.Inflammopharmacology · 2026Review
- Role of intravenous vitamin C on outcomes in hospitalized patients with moderate or severe COVID-19: a real life data of Turkish patients.Inflammopharmacology · 2025Article
- Herbal and Dietary Supplements as Adjunctive Treatment for Mild SARS-CoV-2 Infection in Italy.Nutrients · 2025Review
- Protective Effects of Liposomal Vitamin C on SARS-CoV-2 Target Viral Entry Genes in Renal Cells.Reports of biochemistry & molecular biology · 2025Article
- Association between rheumatoid arthritis and serum vitamin C levels in Adults: Based on the National health and Nutrition Examination survey database.Preventive medicine reports · 2024Article
- Dietary patterns and micronutrients in respiratory infections including COVID-19: a narrative review.BMC public health · 2024Review
- The evidence to date: implications of l-ascorbic acid in the pathophysiology of aging.The journal of physiological sciences : JPS · 2024Review
- Article
- A Global Overview of Dietary Supplements: Regulation, Market Trends, Usage during the COVID-19 Pandemic, and Health Effects.Nutrients · 2023Review
13 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe COVID-19 pandemic has placed an enormous and growing burden on the population and health infrastructure, warranting innovative ways to mitigate risk of contracting and developing severe forms of this disease. A growing body of literature raises the issue of vitamin C and vitamin D as a risk-assessment tool, and therapeutic option, in COVID-19.
objectiveThe objective of this pilot study was to measure serum vitamin C and vitamin D levels in a cohort of patients with critical COVID-19 illness in our community hospital ICU, correlate with other illness risk factors (age, BMI, HgbA1c, smoking status), generate hypotheses, and suggest further therapeutic intervention studies.
methodThis pilot study included all 21 critically ill COVID-19 patients hospitalized in May 2020 in the ICU of North Suburban Medical Center, Thornton, Colorado, in whose care the principal investigator (C.A.) was involved. We measured patients' serum vitamin C and vitamin D levels, and standard risk factors like age, BMI, HbA1c, and smoking status. Variables in this study were gauged using descriptive statistics.
resultsOf 21 critically ill COVID-19 patients (15 males and 6 females, 17 Hispanic and 4 Caucasian, of median age 61 years, range 20-94), there were 11 survivors.Serum levels of vitamin C and vitamin D were low in most of our critically ill COVID-19 ICU patients.Older age and low vitamin C level appeared co-dependent risk factors for mortality from COVID-19 in our sample.Insulin resistance and obesity were prevalent in our small cohort, but smoking was not.
conclusionOur pilot study found low serum levels of vitamin C and vitamin D in most of our critically ill COVID-19 ICU patients. Older age and low vitamin C level appeared co-dependent risk factors for mortality. Many were also insulin-resistant or diabetic, overweight or obese, known as independent risk factors for low vitamin C and vitamin D levels, and for COVID-19.These findings suggest the need to further explore whether caring for COVID-19 patients ought to routinely include measuring and correcting serum vitamin C and vitamin D levels, and whether treating critically ill COVID-19 warrants acute parenteral vitamin C and vitamin D replacement.
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Registered trials
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