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Hill's Criteria indicates that COVID-19 will be treated by Vitamin D - Annweiler June 8 2020

Point of view: Should COVID-19 patients be supplemented with vitamin D?

Maturitas 140 (2020) 24–26


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Cedric Annweiler a,b,c,*, Zhijian Cao d,e,**, Jean-Marc Sabatierf

  • a Department of Geriatric Medicine and Memory Clinic, Research Center on Autonomy and Longevity, University Hospital, Angers, France
  • b UPRES EA 4638, University of Angers, Angers, France
  • c Robarts Research Institute, Department of Medical Biophysics, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON, Canada
  • d State Key Laboratory of Virology, Modern Virology Research Center, College of Life Sciences, Wuhan University, Wuhan, 430072, China
  • e Hubei Province Engineering and Technology Research, Center for Fluorinated Pharmaceuticals, Wuhan University, Wuhan, 430072, China f Aix-Marseille University, Institute of NeuroPhysiopathology, UMR 7051, 27, BdJean Moulin, 13385, Marseille Cedex, France

Corresponding author at: Department of Geriatric Medicine, Angers University Hospital, F-49933, Angers, France.
Corresponding author at: State Key Laboratory of Virology, Modern Virology Research Center, College of Life Sciences, Wuhan University, Wuhan 430072, Hubei, China.

  • Cedric.Annweiler@chu-angers.fr (C. Annweiler),
  • zjcao@whu.edu.cn (Z. Cao).

Using Hill's methodology for exploring causality, we aimed to determine in early May 2020 whether evidence supports vitamin D as a biological determinant of COVID-19 outcomes. Vitamin D is a secosteroid hormone theoretically able to reduce COVID-19 risk through regulation of (i) the renin-angiotensin system, (ii) cellular innate and adaptive immunity, and (iii) physical barriers. Inverse associations were found between 25-hydro- xyvitamin D concentrations and COVID-19 incidence and mortality. Randomized controlled trials testing vitamin D supplementation in the treatment of COVID-19 are in progress. Positive results in such studies would encourage the use of vitamin D supplements as an adjuvant treatment in COVID-19.


As of June 4, 2020, the COVID-19 pandemic caused by the SARS- CoV-2 virus has seen the infection of more than 6,300,000 people in 194 countries around the world, leaving more than 380,000 dead [1]. Symptoms include fever, marked asthenia and dry cough, which may gradually progress to severe manifestations such as lethal acute respiratory disease syndrome (ARDS) [2]. With the lack of scientifically- validated treatment, chemoprevention and vaccination, the immediate repurposing of existing drugs gives hope of curbing the pandemic. Importantly, a recent unbiased genomics-guided tracing of the SARS- CoV-2 targets in human cells identified vitamin D among the three topscoring molecules manifesting potential infection mitigation patterns [3]. We aimed to determine whether preclinical and epidemiological evidence supports vitamin D as a central biological determinant of COVID-19 outcomes.


To assess the value of this natural drug candidate as objectively and consensually as possible, literature from Medline and preprint databases was critically reviewed in early May 2020. Evidence is summarized in Table 1 using Hill's criteria for causality in a biological system [4].


Preclinical findings
Vitamin D is a secosteroid hormone, the active form of which (125- dihydroxyvitamin D) binds to vitamin D receptor (VDR) [5]. The latter complex is then translocated into the cell nucleus, where it combines with retinoid X receptor (RXR). The RXR-VDR heterodimer finally interacts with DNA at sites referred to as Vitamin D Response Elements (VDRE) located in the promoter regions of genes, and expression is either activated or repressed [5]. This is the way vitamin D may theoretically reduce the risks of COVID-19 infection and mortality through, at least, three mechanisms: (i) regulation of the renin-angiotensin system (RAS), (ii) cellular innate and adaptive immunity, and (iii) physical barriers [6].

Table 1 - Evidence that vitamin D is causally linked to COVID-19 outcomes using consensual Hill's criteria for causality in a biological system.
25(OH)D: 25-hydroxyvitamin D; ACE2: angiotensin-converting enzyme 2; BAME: Black, Asian and Minority Ethnic; CI: confidence interval; COVID-19: coronavirus disease 2019; OR = odds ratio; RCT: randomized controlled trials.

First, vitamin D reduces lung permeability in animal models of ARDS by modulating RAS activity and angiotensin-converting enzyme- 2 (ACE2) expression [7]. This action is crucial since the SARS-CoV-2 reportedly uses ACE2 as the main receptor to infect host cells and downregulates ACE2 expression [1]. ACE2 is expressed in many organs, notably in lung alveolar epithelial cells, where it exerts some protective effects against inflammatory damages. In COVID-19, ACE2 down- regulation leads to unopposed inflammatory chain-reaction, cytokine storm (i.e. generation of both pro-inflammatory and anti-inflammatory cytokines by innate immune system) and lethal ARDS [1]. In contrast, a study in rats with chemically-induced ARDS reported that vitamin D administration increased the mRNA and proteins levels of ACE2 [8]. The rats supplemented with vitamin D exhibited milder symptoms of ARDS and moderate lung changes as compared to controls [8].

Second, numerous studies have described the antiviral effects of vitamin D, which acts either by induction of antimicrobial peptides with direct antiviral activities against enveloped and nonenveloped viruses or through immunomodulatory and anti-inflammatory effects [9,10]. The latter may be important in COVID-19 to minimize the cytokine storm [11]. Vitamin D may prevent ARDS [12] by reducing the production of pro-inflammatory Th1 cytokines, such as tumor necrosis factor a and interferon y [9,10]. It also increases the expression of antiinflammatory cytokines by macrophages [9,10].
Third, vitamin D stabilizes physical barriers. They consist of cells that are tightly joined to prevent invaders (such as viruses) from reaching tissues that are sensitive to infection. Although viruses are altering cell junction integrity, which favors virus-to-cell infection, vitamin D contributes to the maintenance of functional tight junctions, gap junctions, and adherens junctions via E-cadherin [6].

Epidemiological findings

Vitamin D is naturally synthesized in the skin after exposure to solar ultraviolet-B rays when the sun's elevation angle is above about 45 degrees [13]. Hypovitaminosis D in humans is therefore more common in winter from October to March at northern latitudes (above 20 degrees) [5], which correspond precisely to the latitudes where some high lethality rates of COVID-19 were observed during the first months of winter 2020 [1] but exceptions have also occurred. For example, Norway and Finland suffered a relatively mild epidemic compared to Italy and Spain [14]. Moreover, it is noticeable that COVID-19 mortality disproportionately impacts BAME (Black, Asian and Minority Ethnic) individuals [15], whose melanin levels are reducing the potential of vitamin D synthesis by the skin.

Consistently, the first reports in COVID-19 patients indicate that hypovitaminosis D is highly prevalent in this population, reaching 85 % [16], and that serum 25-hydroxyvitamin D (25(OH)D) concentrations are lower in COVID-19 patients than in controls [17]. However, lower vitamin D concentrations are usually found in older individuals and those in poor health [5]. Similarly, significant inverse correlations were reported in 20 European countries between the mean serum 25(OH)D concentrations and the number of COVID-19 cases/1 M, as well as with mortality/1 M [18]. In another study, this association, although significant in the univariate model (P = 0.013), disappeared after adjustment for several confounders (P = 0.208) in younger and middle-aged adults [19]. Also, besides the risk of infection, the severity of hypovi- taminosis D appeared to relate to the prognosis of the infection since the mortality rate, in a study with 780 COVID-19 patients, was multiplied by 7.6 in the case of 25(OH)D < 75 nmol/L (mean age, 46.6years) after adjustment for age, gender and comorbidities (P < 0.001), although 25(OH)D < 50 nmol/L (mean age, 66.9years) was associated to greater mortality rate with adjusted odds ratio of 10.1 (P < 0.001) [20]. Another observational study in 212 cases showed that, for each standard deviation increase in serum 25(OH)D, the probability of mild rather than severe COVID-19 was multiplied by 7.9(P < 0.001), while the probability of mild rather than critical COVID-19 was multiplied by 19.6 (P < 0.001) [21]. These results suggest that increasing serum 25(OH)D concentrations might improve the prognosis of COVID-19.
Randomized controlled trials (RCTs) are warranted to investigate the role of vitamin D supplementation on COVID-19 outcomes. Interestingly, previous RCT meta-analyses found that prophylactic vitamin D supplementation was able to reduce the risk of acute respiratory tract infections [22]. The optimal dose ranged between 1,000-4,000IU/day, suggesting benefits of high-dose vitamin D supplementation; just as did a previous study in intensive care that reported 17 % mortality rate reduction among patients having received high-dose vitamin D compared to a placebo [23]. Based on these observations, an RCT dedicated to COVID-19 is testing the effect on 14- day mortality ofhigh-dose vitamin D versus standard dose in COVID-19 older patients (https://clinicaltrials.gov/ct2/show/NCT04344041).

Causality inference

Hill’s criteria for causality were used to evaluate whether vitamin D may be considered causally linked to COVID-19 outcomes (Table 1). Not all Hill’s criteria need to be satisfied to claim causality, but the more that are, the stronger the claim. All criteria were satisfied here, with the exception of specificity, which is a minor criterion generally not used for vitamin D [24]. RCTs dedicated to COVID-19 are in progress. It should be acknowledged that the quality of some evidence assigned to Hill’s criteria was not very strong here, e.g. relying on a small number of non-peer-reviewed preprints rapidly released in the COVID-19 era and complete absence of high-quality RCTs. Also, an alternate explanation could be that vitamin D level accounts for general health and that vitamin D supplementation improves the clinical picture and frailty of the host, rather than directly combating the infection and its complications. However, both hypotheses encourage the examination of supplementation of COVID-19 cases with vitamin D [25].


Suggestive evidence was gathered that serum vitamin D may be considered a biological determinant of COVID-19 outcomes according to Hill’s criteria for causality. Given the lack of specific treatment for COVID-19, the urgency of the pandemic, and the safety of vitamin D supplementation, these observations provide an argument for testing vitamin D as an adjuvant treatment to improve the clinical presentation of COVID-19 and its prognosis, just as recently recommended in prophylaxis by some scientific societies [26]


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  7. W. Yuan, W. Pan, J. Kong, W. Zheng, F.L. Szeto, W.E. Wong, et al., 1,25-dihy- droxyvitamin D3 suppresses renin gene transcription by blocking the activity of the cyclic AMP response element in the renin gene promoter, J. Biol. Chem. 282 (2007) 29821-29830.
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