Vitamin D Supplementation to Prevent COVID-19 Infections and Deaths—Accumulating Evidence from Epidemiological and Intervention Studies Calls for Immediate Action
, H., Nutrients, doi:10.3390/nu13020411, Jan 2021
Vitamin D for COVID-19
8th treatment shown to reduce risk in
October 2020, now with p < 0.00000000001 from 126 studies, recognized in 18 countries.
No treatment is 100% effective. Protocols
combine treatments.
6,200+ studies for
200+ treatments. c19early.org
|
Summary of epidemiological and intervention studies for vitamin D supplementation. Author concludes that despite limitations, evidence strongly supports widespread supplementation, in particular for high-risk populations, as well as high-dose supplementation for those infected.
1.
Jaurrieta-Largo et al., A Machine Learning Approach to Understanding the Genetic Role in COVID-19 Prognosis: The Influence of Gene Polymorphisms Related to Inflammation, Vitamin D, and ACE2, International Journal of Molecular Sciences, doi:10.3390/ijms26167975.
2.
Al-Khrasani et al., Do vitamins halt the COVID-19-evoked pro-inflammatory cytokines involved in the development of neuropathic pain?, Biomedicine & Pharmacotherapy, doi:10.1016/j.biopha.2025.118346.
3.
Kow et al., Vitamin D and COVID‐19: How much more evidence do we need?, Nutrition in Clinical Practice, doi:10.1002/ncp.11349.
4.
Bigman et al., A Comprehensive Scoping Review on Diet and Nutrition in Relation to Long COVID-19 Symptoms and Recovery, Nutrients, doi:10.3390/nu17111802.
5.
Hewison, M., COVID-19 and our understanding of vitamin D and immune function, The Journal of Steroid Biochemistry and Molecular Biology, doi:10.1016/j.jsbmb.2025.106710.
6.
Wimalawansa, S., Vitamin D Deficiency Meets Hill’s Criteria for Causation in SARS-CoV-2 Susceptibility, Complications, and Mortality: A Systematic Review, Nutrients, doi:10.3390/nu17030599.
7.
Sanduzzi Zamparelli et al., Immune-Boosting and Antiviral Effects of Antioxidants in COVID-19 Pneumonia: A Therapeutic Perspective, Life, doi:10.3390/life15010113.
8.
Fazli et al., Possible Link between Gut Microbiota, Diet, and COVID-19 Infection, Journal of Medical Bacteriology, 12:4, jmb.tums.ac.ir/index.php/jmb/article/view/525.
9.
Wojciulik et al., The impact of genetic polymorphism on course and severity of the SARS-CoV-2 infection and COVID-19 disease, Przeglad Epidemiologiczny, doi:10.32394/pe/194862.
10.
Wimalawansa (B), S., Unveiling the Interplay—Vitamin D and ACE-2 Molecular Interactions in Mitigating Complications and Deaths from SARS-CoV-2, Biology, doi:10.3390/biology13100831.
11.
Santa et al., Comparative analysis of COVID-19 responses in Japan and Africa: diet, phytochemicals, vitamin D, and gut microbiota in reducing mortality—A systematic review and meta-analysis, Frontiers in Nutrition, doi:10.3389/fnut.2024.1465324.
12.
Kaushal, A., Nutraceuticals and pharmacological to balance the transitional microbiome to extend immunity during COVID-19 and other viral infections, Journal of Translational Medicine, doi:10.1186/s12967-024-05587-9.
13.
Mu et al., Anti-inflammatory and Nutritional Interventions Against SARS-CoV-2: A Comprehensive Review, Journal of Agriculture and Food Research, doi:10.1016/j.jafr.2024.101422.
14.
Wimalawansa (C), S., Unlocking Insights: Navigating COVID-19 Challenges and Emulating Future Pandemic Resilience Strategies with Strengthening Natural Immunity, Heliyon, doi:10.1016/j.heliyon.2024.e34691.
15.
Imran et al., Therapeutic Role of Vitamin D in COVID-19 Patients, Clinical Nutrition Open Science, doi:10.1016/j.nutos.2024.07.004.
16.
Grant, W., Vitamin D and viral infections: Infectious diseases, autoimmune diseases, and cancers, Advances in Food and Nutrition Research, doi:10.1016/bs.afnr.2023.12.007.
17.
Polonowita et al., Molecular Quantum and Logic Process of Consciousness—Vitamin D Big-Data in COVID-19—A Case for Incorporating Machine Learning In Medicine, European Journal of Biomedical and Pharmaceutical sciences, doi:10.5281/zenodo.10435649.
18.
Gomaa et al., Pharmacological evaluation of vitamin D in COVID-19 and long COVID-19: recent studies confirm clinical validation and highlight metformin to improve VDR sensitivity and efficacy, Inflammopharmacology, doi:10.1007/s10787-023-01383-x.
19.
Gotelli et al., Understanding the immune-endocrine effects of vitamin D in SARS-CoV-2 infection: a role in protecting against neurodamage?, Neuroimmunomodulation, doi:10.1159/000533286.
20.
Cutolo et al., Involvement of the secosteroid vitamin D in autoimmune rheumatic diseases and COVID-19, Nature Reviews Rheumatology, doi:10.1038/s41584-023-00944-2.
21.
Schloss et al., Nutritional deficiencies that may predispose to long COVID, Inflammopharmacology, doi:10.1007/s10787-023-01183-3.
22.
Arora et al., Global Dietary and Herbal Supplement Use during COVID-19—A Scoping Review, Nutrients, doi:10.3390/nu15030771.
23.
Nicoll et al., COVID-19 Prevention: Vitamin D Is Still a Valid Remedy, Journal of Clinical Medicine, doi:10.3390/jcm11226818.
24.
Foshati et al., Antioxidants and clinical outcomes of patients with coronavirus disease 2019: A systematic review of observational and interventional studies, Food Science & Nutrition, doi:10.1002/fsn3.3034.
25.
Quesada-Gomez et al., Vitamin D Endocrine System and COVID-19: Treatment with Calcifediol, Nutrients, doi:10.3390/nu14132716.
26.
DiGuilio et al., Micronutrient Improvement of Epithelial Barrier Function in Various Disease States: A Case for Adjuvant Therapy, International Journal of Molecular Sciences, doi:10.3390/ijms23062995.
27.
Grant (B) et al., A Narrative Review of the Evidence for Variations in Serum 25-Hydroxyvitamin D Concentration Thresholds for Optimal Health, Nutrients, doi:10.3390/nu14030639.
28.
Shah Alam et al., The role of vitamin D in reducing SARS-CoV-2 infection: An update, International Immunopharmacology, doi:10.1016/j.intimp.2021.107686.
29.
Griffin et al., Perspective: Vitamin D supplementation prevents rickets and acute respiratory infections when given as daily maintenance but not as intermittent bolus: implications for COVID-19, Clinical Medicine, doi:10.7861/clinmed.2021-0035.
30.
Kohlmeier et al., When Mendelian randomisation fails, BMJ Nutrition, Prevention & Health, doi:10.1136/bmjnph-2021-000265.
31.
Brenner, H., Vitamin D Supplementation to Prevent COVID-19 Infections and Deaths—Accumulating Evidence from Epidemiological and Intervention Studies Calls for Immediate Action, Nutrients, doi:10.3390/nu13020411.
32.
Mercola et al., Evidence Regarding Vitamin D and Risk of COVID-19 and Its Severity, Nutrients 2020, 12:11, 3361, doi:10.3390/nu12113361.
33.
Basha et al., Is the shielding effect of cholecalciferol in SARS CoV-2 infection dependable? An evidence based unraveling, Clinical Epidemiology and Global Health, doi:10.1016/j.cegh.2020.10.005.
34.
Xu et al., The importance of vitamin d metabolism as a potential prophylactic, immunoregulatory and neuroprotective treatment for COVID-19, Journal of Translational Medicine, doi:10.1186/s12967-020-02488-5.
35.
Alexander et al., Early Nutritional Interventions with Zinc, Selenium and Vitamin D for Raising Anti-Viral Resistance Against Progressive COVID-19, Nutrients, doi:10.3390/nu12082358.
36.
Andrade et al., Vitamin A and D deficiencies in the prognosis of respiratory tract infections: A systematic review with perspectives for COVID-19 and a critical analysis on supplementation, SciELO preprints, doi:10.1590/SciELOPreprints.839.
37.
Grant (C) et al., Evidence that Vitamin D Supplementation Could Reduce Risk of Influenza and COVID-19 Infections and Deaths, Nutrients, 12:4, 988, doi:10.3390/nu12040988.
38.
McCullough et al., Daily oral dosing of vitamin D3 using 5000 TO 50,000 international units a day in long-term hospitalized patients: Insights from a seven year experience, The Journal of Steroid Biochemistry and Molecular Biology, doi:10.1016/j.jsbmb.2018.12.010.
39.
EFSA, Scientific Opinion on the substantiation of health claims related to vitamin D and normal function of the immune system and inflammatory response (ID 154, 159), maintenance of normal muscle function (ID 155) and maintenance of normal cardiovascular function (ID 159) pursuant to Article 13(1) of Regulation (E, EFSA Journal, doi:10.2903/j.efsa.2010.1468.
40.
EFSA (B), Scientific Opinion on the substantiation of a health claim related to vitamin D and contribution to the normal function of the immune system pursuant to Article 14 of Regulation (EC) No 1924/2006, EFSA Journal, doi:10.2903/j.efsa.2015.4096.
Brenner et al., 28 Jan 2021, peer-reviewed, 1 author.
Vitamin D Supplementation to Prevent COVID-19 Infections and Deaths—Accumulating Evidence from Epidemiological and Intervention Studies Calls for Immediate Action
Nutrients, doi:10.3390/nu13020411
The COVID-19 pandemic poses an unprecedented threat to human health, health care systems, public life, and economy around the globe. The repertoire of effective therapies for severe courses of the disease has remained limited. A large proportion of the world population suffers from vitamin D insufficiency or deficiency, with prevalence being particularly high among the COVID-19 high-risk populations. Vitamin D supplementation has been suggested as a potential option to prevent COVID-19 infections, severe courses, and deaths from the disease, but is not widely practiced. This article provides an up-to-date summary of recent epidemiological and intervention studies on a possible role of vitamin D supplementation for preventing severe COVID-19 cases and deaths. Despite limitations and remaining uncertainties, accumulating evidence strongly supports widespread vitamin D supplementation, in particular of high-risk populations, as well as high-dose supplementation of those infected. Given the dynamics of the COVID-19 pandemic, the benefit-risk ratio of such supplementation calls for immediate action even before results of ongoing large-scale randomized trials become available.
References
Abdollahi, Sarvestani, Rafat, Ghaderkhani, Mahmoudi-Aliabadi et al., The Association Between the Level of Serum 25(OH) Vitamin D, Obesity, and underlying Diseases with the risk of Developing COVID-19 Infection: A case-control study of hospitalized patients in Tehran, Iran, J. Med. Virol, doi:10.1002/jmv.26726
Annweiler, Corvaisier, Gautier, Dubée, Legrand et al., Vitamin D Supplementation Associated to Better Survival in Hospitalized Frail Elderly COVID-19 Patients: The GERIA-COVID Quasi-Experimental Study, Nutrients, doi:10.3390/nu12113377
Annweiler, Hanotte, Grandin De L'eprevier, Sabatier, Lafaie et al., Vitamin D and survival in COVID-19 patients: A quasi-experimental study, J. Steroid Biochem. Mol. Biol, doi:10.1016/j.jsbmb.2020.105771
Brenner, Holleczek, Schöttker, Vitamin, Insufficiency and Deficiency and Mortality from Respiratory Diseases in a Cohort of Older Adults: Potential for Limiting the Death Toll during and beyond the COVID-19 Pandemic?, Nutrients, doi:10.3390/nu12082488
Brenner, Jansen, Saum, Holleczek, Schöttker, Vitamin D Supplementation Trials Aimed at Reducing Mortality Have Much Higher Power When Focusing on People with Low Serum 25-Hydroxyvitamin D Concentrations, J. Nutr, doi:10.3945/jn.117.250191
Brenner, Schöttker, Vitamin D insufficiency may account for almost nine of ten COVID-19 deaths: Time to act, Nutrients, doi:10.3390/nu12123642
Camargo, Jr, Martineau, Vitamin D to prevent COVID-19: Recommendations for the design of clinical trials, FEBS J, doi:10.1111/febs.15534
Cangiano, Fatti, Danesi, Gazzano, Croci et al., Mortality in an Italian nursing home during COVID-19 pandemic: Correlation with gender, age, ADL, vitamin D supplementation, and limitations of the diagnostic tests, Aging
Cantorna, Mechanisms underlying the e_ect of vitamin D on the immune system, Proc. Nutr. Soc
Cantorna, Snyder, Lin, Yang, Vitamin D and 1,25(OH)2D regulation of T cells, Nutrients, doi:10.3390/nu7043011
Cashman, Dowling, Škrabáková, Gonzalez-Gross, Valtueña et al., Vitamin D deficiency in Europe: Pandemic?, Am. J. Clin. Nutr, doi:10.3945/ajcn.115.120873
Castillo, Costa, Barrios, Díaz, Miranda et al., Effect of calcifediol treatment and best available therapy versus best available therapy on intensive care unit admission and mortality among patients hospitalized for COVID-19: A pilot randomized clinical study, J. Steroid Biochem. Mol. Biol, doi:10.1016/j.jsbmb.2020.105751
Covid, 19 and Vitamin D Supplementation: A Multicenter Randomized Controlled Trial of High Dose Versus Standard Dose Vitamin
Faniyi, Lugg, Faustini, Webster, Duffy et al., Vitamin D status and seroconversion for COVID-19 in UK healthcare workers, Eur. Respir. J
Grant, Lahore, Mcdonnell, Baggerly, French et al., Evidence that vitamin D supplementation could reduce risk of influenza and COVID-19 infections and deaths, Nutrients, doi:10.3390/nu12040988
Griffin, Wall, Blake, Griffin, Robinson et al., Vitamin D Status of Adults in the Community, in Outpatient Clinics, in Hospital, and in Nursing Homes in the West of Ireland, J. Gerontol. A Biol. Sci. Med. Sci, doi:10.1093/gerona/glaa010
Hastie, Mackay, Ho, Celis-Morales, Katikireddi et al., Vitamin D concentrations and COVID-19 infection in UK Biobank, Diabetes Metab. Syndr, doi:10.1016/j.dsx.2020.04.050
Ilie, Stefanescu, Smith, The role of vitamin D in the prevention of coronavirus disease 2019 infection and mortality, Aging Clin. Exp. Res, doi:10.1007/s40520-020-01570-8
Jeffery, Burke, Mura, Zheng, Qureshi et al., 1,25-Dihydroxyvitamin D3 and IL-2 combine to inhibit T cell production of inflammatory cytokines and promote development of regulatory T cells expressing CTLA-4 and FoxP3, J. Immunol, doi:10.4049/jimmunol.0803217
Jungreis, Kellis, Mathematical analysis of Córdoba calcifediol trial suggests strong role for Vitamin D in reducing ICU admissions of hospitalized COVID-19 patients, MedRxiv, doi:10.1101/2020.11.08.20222638
Kaufman, Niles, Kroll, Bi, Holick, SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels, PLoS ONE, doi:10.1371/journal.pone.0239252
Keum, Lee, Greenwood, Manson, Giovannucci, Vitamin D supplementation and total cancer incidence and mortality: A meta-analysis of randomized controlled trials, Ann. Oncol, doi:10.1093/annonc/mdz059
Lemire, Adams, Kermani-Arab, Bakke, Sakai et al., 1,25-Dihydroxyvitamin D3 suppresses human T helper/inducer lymphocyte activity in vitro, J. Immunol
Ling, Broad, Murphy, Pappachan, Pardesi-Newton et al., High-Dose Cholecalciferol Booster Therapy is Associated with a Reduced Risk of Mortality in Patients with COVID-19: A Cross-Sectional Multi-Centre Observational Study, Nutrients, doi:10.3390/nu12123799
Martineau, Jolliffe, Hooper, Greenberg, Aloia et al., Vitamin D supplementation to prevent acute respiratory tract infections: Systematic review and meta-analysis of individual participant data, BMJ, doi:10.1136/bmj.i6583
Merzon, Tworowski, Gorohovski, Vinker, Golan Cohen et al., Low plasma 25(OH) vitamin D level is associated with increased risk of COVID-19 infection: An Israeli population-based study, FEBS J, doi:10.1111/febs.15495
Murai, Fernandes, Sales, Pinto, Goessler et al., Effect of Vitamin D 3 Supplementation vs. Placebo on Hospital Length of Stay in Patients with Severe COVID-19: A Multicenter, Double-blind, Randomized Controlled Trial, doi:10.1101/2020.11.16.20232397
Pagano, Peruzzu, Ruggieri, Ortona, Gagliardi, Vitamin D and Sex Differences in COVID-19, Front. Endocrinol, doi:10.3389/fendo.2020.567824
Radujkovic, Hippchen, Tiwari-Heckler, Dreher, Boxberger et al., Vitamin D Deficiency and Outcome of COVID-19 Patients, Nutrients, doi:10.3390/nu12092757
Rastogi, Bhansali, Khare, Suri, Yaddanapudi et al., Short term, high-dose vitamin D supplementation for COVID-19 disease: A randomised, placebo-controlled, study (SHADE study), Postgrad Med. J, doi:10.1136/postgradmedj-2020-139065
Rizzoli, Boonen, Brandi, Bruyère, Cooper et al., Vitamin D supplementation in elderly or postmenopausal women: A 2013 update of the 2008 recommendations from the European Society for Clinical and Economic Aspects of Osteoporosis and Osteoarthritis (ESCEO), Curr. Med. Res. Opin, doi:10.1185/03007995.2013.766162
Spanier, Nashold, Mayne, Nelson, Hayes, Vitamin D and estrogen synergy in Vdr-expressing CD4(+) T cells is essential to induce Helios(+)FoxP3(+) T cells and prevent autoimmune demyelinating disease, J. Neuroimmunol, doi:10.1016/j.jneuroim.2015.06.015
Suissa, Immortal time bias in pharmaco-epidemiology, Am. J. Epidemiol, doi:10.1093/aje/kwm324
Vassiliou, Jahaj, Pratikaki, Orfanos, Dimopoulou et al., Low 25-Hydroxyvitamin D Levels on Admission to the Intensive Care Unit May Predispose COVID-19 Pneumonia Patients to a Higher 28-Day Mortality Risk: A Pilot Study on a Greek ICU Cohort, Nutrients, doi:10.3390/nu12123773
Wang, Degruttola, Lei, Mayer, Redline et al., The vitamin D for COVID-19 (VIVID) trial: A pragmatic cluster-randomized design, Contemp. Clin. Trials, doi:10.1016/j.cct.2020.106176
Weaver, Alexander, Boushey, Dawson-Hughes, Lappe et al., Calcium plus vitamin D supplementation and risk of fractures: An updated meta-analysis from the National Osteoporosis Foundation, Osteoporos. Int, doi:10.1007/s00198-015-3386-5
DOI record:
{
"DOI": "10.3390/nu13020411",
"ISSN": [
"2072-6643"
],
"URL": "http://dx.doi.org/10.3390/nu13020411",
"abstract": "<jats:p>The COVID-19 pandemic poses an unprecedented threat to human health, health care systems, public life, and economy around the globe. The repertoire of effective therapies for severe courses of the disease has remained limited. A large proportion of the world population suffers from vitamin D insufficiency or deficiency, with prevalence being particularly high among the COVID-19 high-risk populations. Vitamin D supplementation has been suggested as a potential option to prevent COVID-19 infections, severe courses, and deaths from the disease, but is not widely practiced. This article provides an up-to-date summary of recent epidemiological and intervention studies on a possible role of vitamin D supplementation for preventing severe COVID-19 cases and deaths. Despite limitations and remaining uncertainties, accumulating evidence strongly supports widespread vitamin D supplementation, in particular of high-risk populations, as well as high-dose supplementation of those infected. Given the dynamics of the COVID-19 pandemic, the benefit–risk ratio of such supplementation calls for immediate action even before results of ongoing large-scale randomized trials become available.</jats:p>",
"alternative-id": [
"nu13020411"
],
"author": [
{
"affiliation": [],
"family": "Brenner",
"given": "Hermann",
"sequence": "first"
}
],
"container-title": "Nutrients",
"container-title-short": "Nutrients",
"content-domain": {
"crossmark-restriction": false,
"domain": []
},
"created": {
"date-parts": [
[
2021,
1,
28
]
],
"date-time": "2021-01-28T10:23:05Z",
"timestamp": 1611829385000
},
"deposited": {
"date-parts": [
[
2023,
10,
19
]
],
"date-time": "2023-10-19T11:56:22Z",
"timestamp": 1697716582000
},
"indexed": {
"date-parts": [
[
2023,
11,
6
]
],
"date-time": "2023-11-06T06:45:15Z",
"timestamp": 1699253115947
},
"is-referenced-by-count": 28,
"issue": "2",
"issued": {
"date-parts": [
[
2021,
1,
28
]
]
},
"journal-issue": {
"issue": "2",
"published-online": {
"date-parts": [
[
2021,
2
]
]
}
},
"language": "en",
"license": [
{
"URL": "https://creativecommons.org/licenses/by/4.0/",
"content-version": "vor",
"delay-in-days": 0,
"start": {
"date-parts": [
[
2021,
1,
28
]
],
"date-time": "2021-01-28T00:00:00Z",
"timestamp": 1611792000000
}
}
],
"link": [
{
"URL": "https://www.mdpi.com/2072-6643/13/2/411/pdf",
"content-type": "unspecified",
"content-version": "vor",
"intended-application": "similarity-checking"
}
],
"member": "1968",
"original-title": [],
"page": "411",
"prefix": "10.3390",
"published": {
"date-parts": [
[
2021,
1,
28
]
]
},
"published-online": {
"date-parts": [
[
2021,
1,
28
]
]
},
"publisher": "MDPI AG",
"reference": [
{
"key": "ref1",
"unstructured": "Johns Hopkins University Corona Virus Resource Centerhttps://coronavirus.jhu.edu/"
},
{
"DOI": "10.3390/nu12040988",
"doi-asserted-by": "publisher",
"key": "ref2"
},
{
"DOI": "10.1016/j.dsx.2020.04.050",
"doi-asserted-by": "publisher",
"key": "ref3"
},
{
"DOI": "10.1111/febs.15495",
"doi-asserted-by": "publisher",
"key": "ref4"
},
{
"DOI": "10.3945/jn.117.250191",
"doi-asserted-by": "publisher",
"key": "ref5"
},
{
"DOI": "10.1371/journal.pone.0239252",
"doi-asserted-by": "publisher",
"key": "ref6"
},
{
"DOI": "10.1002/jmv.26726",
"doi-asserted-by": "publisher",
"key": "ref7"
},
{
"DOI": "10.1183/13993003.04234-2020",
"article-title": "Vitamin D status and seroconversion for COVID-19 in UK healthcare workers",
"author": "Faniyi",
"doi-asserted-by": "crossref",
"first-page": "2004234",
"journal-title": "Eur. Respir. J.",
"key": "ref8",
"year": "2020"
},
{
"DOI": "10.1007/s40520-020-01570-8",
"doi-asserted-by": "publisher",
"key": "ref9"
},
{
"DOI": "10.3390/nu12092757",
"doi-asserted-by": "publisher",
"key": "ref10"
},
{
"DOI": "10.3390/nu12123642",
"doi-asserted-by": "publisher",
"key": "ref11"
},
{
"DOI": "10.3390/nu12123773",
"doi-asserted-by": "publisher",
"key": "ref12"
},
{
"DOI": "10.3390/nu12113377",
"doi-asserted-by": "publisher",
"key": "ref13"
},
{
"DOI": "10.1016/j.jsbmb.2020.105771",
"doi-asserted-by": "publisher",
"key": "ref14"
},
{
"DOI": "10.18632/aging.202307",
"article-title": "Mortality in an Italian nursing home during COVID-19 pandemic: Correlation with gender, age, ADL, vitamin D supplementation, and limitations of the diagnostic tests",
"author": "Cangiano",
"doi-asserted-by": "crossref",
"first-page": "24522",
"journal-title": "Aging",
"key": "ref15",
"volume": "12",
"year": "2020"
},
{
"DOI": "10.3390/nu12123799",
"doi-asserted-by": "publisher",
"key": "ref16"
},
{
"DOI": "10.1093/aje/kwm324",
"doi-asserted-by": "publisher",
"key": "ref17"
},
{
"DOI": "10.1016/j.jsbmb.2020.105751",
"doi-asserted-by": "publisher",
"key": "ref18"
},
{
"DOI": "10.1101/2020.11.08.20222638",
"doi-asserted-by": "publisher",
"key": "ref19"
},
{
"DOI": "10.1136/postgradmedj-2020-139065",
"doi-asserted-by": "publisher",
"key": "ref20"
},
{
"DOI": "10.1101/2020.11.16.20232397",
"doi-asserted-by": "publisher",
"key": "ref21"
},
{
"DOI": "10.1111/febs.15534",
"doi-asserted-by": "publisher",
"key": "ref22"
},
{
"key": "ref23"
},
{
"key": "ref24"
},
{
"key": "ref25"
},
{
"DOI": "10.1016/j.cct.2020.106176",
"doi-asserted-by": "publisher",
"key": "ref26"
},
{
"DOI": "10.3945/ajcn.115.120873",
"doi-asserted-by": "publisher",
"key": "ref27"
},
{
"DOI": "10.1007/s00198-015-3386-5",
"doi-asserted-by": "publisher",
"key": "ref28"
},
{
"DOI": "10.1136/bmj.i6583",
"doi-asserted-by": "publisher",
"key": "ref29"
},
{
"DOI": "10.1093/annonc/mdz059",
"doi-asserted-by": "publisher",
"key": "ref30"
},
{
"DOI": "10.1185/03007995.2013.766162",
"doi-asserted-by": "publisher",
"key": "ref31"
},
{
"DOI": "10.1093/gerona/glaa010",
"doi-asserted-by": "publisher",
"key": "ref32"
},
{
"DOI": "10.3390/nu12082488",
"doi-asserted-by": "publisher",
"key": "ref33"
},
{
"DOI": "10.1017/S0029665110001722",
"doi-asserted-by": "publisher",
"key": "ref34"
},
{
"DOI": "10.4049/jimmunol.134.5.3032",
"article-title": "1,25-Dihydroxyvitamin D3 suppresses human T helper/inducer lymphocyte activity in vitro",
"author": "Lemire",
"doi-asserted-by": "crossref",
"first-page": "3032",
"journal-title": "J. Immunol.",
"key": "ref35",
"volume": "134",
"year": "1985"
},
{
"DOI": "10.3390/nu7043011",
"doi-asserted-by": "publisher",
"key": "ref36"
},
{
"DOI": "10.4049/jimmunol.0803217",
"doi-asserted-by": "publisher",
"key": "ref37"
},
{
"DOI": "10.1016/j.jneuroim.2015.06.015",
"doi-asserted-by": "publisher",
"key": "ref38"
},
{
"DOI": "10.3389/fendo.2020.567824",
"doi-asserted-by": "publisher",
"key": "ref39"
}
],
"reference-count": 39,
"references-count": 39,
"relation": {},
"resource": {
"primary": {
"URL": "https://www.mdpi.com/2072-6643/13/2/411"
}
},
"score": 1,
"short-title": [],
"source": "Crossref",
"subject": [],
"subtitle": [],
"title": "Vitamin D Supplementation to Prevent COVID-19 Infections and Deaths—Accumulating Evidence from Epidemiological and Intervention Studies Calls for Immediate Action",
"type": "journal-article",
"volume": "13"
}

