Akhtar S, Das JK, Ismail T, Wahid M, Saeed W, Bhutta ZA. Nutritional perspectives for the prevention and mitigation of COVID-19. Nutr Rev. 2021 Feb 11;79(3):289-300. doi: 10.1093/nutrit/nuaa063. PMID: 33570583; PMCID: PMC7454773.

Al Kiyumi MH, Kalra S, Davies JS, Kalhan A. The Impact of Vitamin D Deficiency on the Severity of Symptoms and Mortality Rate among Adult Patients with Covid-19: A Systematic Review and Meta-Analysis. Indian J Endocrinol Metab. 2021 Jul-Aug;25(4):261-282. doi: 10.4103/ijem.ijem_115_21. Epub 2021 Dec 15. PMID: 35136732; PMCID: PMC8793953.

Bassatne A, Basbous M, Chakhtoura M, El Zein O, Rahme M, El-Hajj Fuleihan G. The link between COVID-19 and VItamin D (VIVID): A systematic review and meta-analysis. Metabolism. 2021 Jun;119:154753. doi: 10.1016/j.metabol.2021.154753. Epub 2021 Mar 24. PMID: 33774074; PMCID: PMC7989070.

Borsche L, Glauner B, von Mendel J. COVID-19 Mortality Risk Correlates Inversely with Vitamin D3 Status, and a Mortality Rate Close to Zero Could Theoretically Be Achieved at 50 ng/mL 25(OH)D3: Results of a Systematic Review and Meta-Analysis. Nutrients. 2021 Oct 14;13(10):3596. doi: 10.3390/nu13103596. PMID: 34684596; PMCID: PMC8541492.

Chiodini I, Gatti D, Soranna D, Merlotti D, Mingiano C, Fassio A, Adami G, Falchetti A, Eller-Vainicher C, Rossini M, Persani L, Zambon A, Gennari L. Vitamin D Status and SARS-CoV-2 Infection and COVID-19 Clinical Outcomes. Front Public Health. 2021 Dec 22;9:736665. doi: 10.3389/fpubh.2021.736665. PMID: 35004568; PMCID: PMC8727532.

Crafa A, Cannarella R, Condorelli RA, Mongioì LM, Barbagallo F, Aversa A, La Vignera S, Calogero AE. Influence of 25-hydroxy-cholecalciferol levels on SARS-CoV-2 infection and COVID-19 severity: A systematic review and meta-analysis. EClinicalMedicine. 2021 Jul;37:100967. doi: 10.1016/j.eclinm.2021.100967. Epub 2021 Jun 18. Erratum in: EClinicalMedicine. 2021 Nov;41:101168. PMID: 34179737; PMCID: PMC8215557.

Dissanayake HA, de Silva NL, Sumanatilleke M, de Silva SDN, Gamage KKK, Dematapitiya C, Kuruppu DC, Ranasinghe P, Pathmanathan S, Katulanda P. Prognostic and therapeutic role of vitamin D in COVID-19: systematic review and meta-analysis. J Clin Endocrinol Metab. 2021 Dec 11:dgab892. doi: 10.1210/clinem/dgab892. Epub ahead of print. PMID: 34894254; PMCID: PMC8689831.

Dramé M, Cofais C, Hentzien M, Proye E, Coulibaly PS, Demoustier-Tampère D, Destailleur MH, Lotin M, Cantagrit E, Cebille A, Desprez A, Blondiau F, Kanagaratnam L, Godaert L. Relation between Vitamin D and COVID-19 in Aged People: A Systematic Review. Nutrients. 2021 Apr 17;13(4):1339. doi: 10.3390/nu13041339. PMID: 33920639; PMCID: PMC8073922.

Ebrahimzadeh A, Mohseni S, Narimani B, Ebrahimzadeh A, Kazemi S, Keshavarz F, Yaghoubi MJ, Milajerdi A. Association between vitamin D status and risk of covid-19 in-hospital mortality: A systematic review and meta-analysis of observational studies. Crit Rev Food Sci Nutr. 2021 Dec 9:1-11. doi: 10.1080/10408398.2021.2012419. Epub ahead of print. PMID: 34882024.

Fakhrolmobasheri M, Mazaheri-Tehrani S, Kieliszek M, Zeinalian M, Abbasi M, Karimi F, Mozafari AM. COVID-19 and Selenium Deficiency: a Systematic Review. Biol Trace Elem Res. 2021 Nov 5:1–12. doi: 10.1007/s12011-021-02997-4. Epub ahead of print. PMID: 34739678; PMCID: PMC8569840.

Flouchi, R. and FIKRI-BENBRAHIM, K., 2020. Prevention of COVID 19 by aromatic and medicinal plants: A systematic review. Journal of Pharmaceutical Sciences and Research, 12(8), pp.1106-1111.

Ghasemian R, Shamshirian A, Heydari K, Malekan M, Alizadeh-Navaei R, Ebrahimzadeh MA, Ebrahimi Warkiani M, Jafarpour H, Razavi Bazaz S, Rezaei Shahmirzadi A, Khodabandeh M, Seyfari B, Motamedzadeh A, Dadgostar E, Aalinezhad M, Sedaghat M, Razzaghi N, Zarandi B, Asadi A, Yaghoubi Naei V, Beheshti R, Hessami A, Azizi S, Mohseni AR, Shamshirian D. The role of vitamin D in the age of COVID-19: A systematic review and meta-analysis. Int J Clin Pract. 2021 Nov;75(11):e14675. doi: 10.1111/ijcp.14675. Epub 2021 Aug 6. PMID: 34322971; PMCID: PMC8420549.

Halim, Ceria et al. “The Association between TNF-α, IL-6, and Vitamin D Levels and COVID-19 Severity and Mortality: A Systematic Review and Meta-Analysis.” Pathogens (Basel, Switzerland) vol. 11,2 195. 1 Feb. 2022, doi:10.3390/pathogens11020195

Hu, H., Pan, H., Li, R., He, K., Zhang, H. and Liu, L., 2022. Increased Circulating Cytokines Have a Role in COVID-19 Severity and Death With a More Pronounced Effect in Males: A Systematic Review and Meta-Analysis. Frontiers in pharmacology, 13.

Hunter, J., Arentz, S., Goldenberg, J., Yang, G., Beardsley, J., Myers, S.P., Mertz, D. and Leeder, S., 2021. Zinc for the prevention or treatment of acute viral respiratory tract infections in adults: a rapid systematic review and meta-analysis of randomised controlled trials. BMJ open, 11(11), p.e047474.

James PT, Ali Z, Armitage AE, Bonell A, Cerami C, Drakesmith H, Jobe M, Jones KS, Liew Z, Moore SE, Morales-Berstein F, Nabwera HM, Nadjm B, Pasricha SR, Scheelbeek P, Silver MJ, Teh MR, Prentice AM. The Role of Nutrition in COVID-19 Susceptibility and Severity of Disease: A Systematic Review. J Nutr. 2021 Jul 1;151(7):1854-1878. doi: 10.1093/jn/nxab059. PMID: 33982105; PMCID: PMC8194602.

Jayawardena R, Sooriyaarachchi P, Chourdakis M, Jeewandara C, Ranasinghe P. Enhancing immunity in viral infections, with special emphasis on COVID-19: A review. Diabetes Metab Syndr. 2020 Jul-Aug;14(4):367-382. doi: 10.1016/j.dsx.2020.04.015. Epub 2020 Apr 16. PMID: 32334392; PMCID: PMC7161532.

Jolliffe, D.A., Camargo Jr, C.A., Sluyter, J.D., Aglipay, M., Aloia, J.F., Ganmaa, D., Bergman, P., Bischoff-Ferrari, H.A., Borzutzky, A., Damsgaard, C.T. and Dubnov-Raz, G., 2021. Vitamin D supplementation to prevent acute respiratory infections: a systematic review and meta-analysis of aggregate data from randomised controlled trials. The Lancet Diabetes & Endocrinology, 9(5), pp.276-292.

Kazemi A, Mohammadi V, Aghababaee SK, Golzarand M, Clark CCT, Babajafari S. Association of Vitamin D Status with SARS-CoV-2 Infection or COVID-19 Severity: A Systematic Review and Meta-analysis. Adv Nutr. 2021 Oct 1;12(5):1636-1658. doi: 10.1093/advances/nmab012. Erratum in: Adv Nutr. 2021 Oct 1;12(5):2040-2044. PMID: 33751020; PMCID: PMC7989595.

Liu, N., Sun, J., Wang, X., Zhang, T., Zhao, M. and Li, H., 2021. Low vitamin D status is associated with coronavirus disease 2019 outcomes: a systematic review and meta-analysis. International Journal of Infectious Diseases, 104, pp.58-64.

Munshi R, Hussein MH, Toraih EA, Elshazli RM, Jardak C, Sultana N, Youssef MR, Omar M, Attia AS, Fawzy MS, Killackey M, Kandil E, Duchesne J. Vitamin D insufficiency as a potential culprit in critical COVID-19 patients. J Med Virol. 2021 Feb;93(2):733-740. doi: 10.1002/jmv.26360. Epub 2020 Oct 10. PMID: 32716073.

Pechlivanidou, Evmorfia et al. “The prognostic role of micronutrient status and supplements in COVID-19 outcomes: A systematic review.” Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, vol. 162 112901. 25 Feb. 2022, doi:10.1016/j.fct.2022.112901

Pereira M, Dantas Damascena A, Galvão Azevedo LM, de Almeida Oliveira T, da Mota Santana J. Vitamin D deficiency aggravates COVID-19: systematic review and meta-analysis. Crit Rev Food Sci Nutr. 2022;62(5):1308-1316. doi: 10.1080/10408398.2020.1841090. Epub 2020 Nov 4. Update in: Crit Rev Food Sci Nutr. 2021 Aug 12;:1-6. PMID: 33146028.

Petrelli F, Luciani A, Perego G, Dognini G, Colombelli PL, Ghidini A. Therapeutic and prognostic role of vitamin D for COVID-19 infection: A systematic review and meta-analysis of 43 observational studies. J Steroid Biochem Mol Biol. 2021 Jul;211:105883. doi: 10.1016/j.jsbmb.2021.105883. Epub 2021 Mar 26. PMID: 33775818; PMCID: PMC7997262.

Shah K, Varna VP, Pandya A, Saxena D. Low vitamin D levels and prognosis in a COVID-19 pediatric population: a systematic review. QJM. 2021 Nov 5;114(7):447-453. doi: 10.1093/qjmed/hcab202. PMID: 34293161.

Shokri-Mashhadi, Nafiseh et al. “Effects of select dietary supplements on the prevention and treatment of viral respiratory tract infections: a systematic review of randomized controlled trials.” Expert review of respiratory medicine vol. 15,6 (2021): 805-821. doi:10.1080/17476348.2021.1918546

Smit, M., Marinosci, A., Agoritsas, T. and Calmy, A., 2021. Prophylaxis for COVID-19: a systematic review. Clinical Microbiology and Infection, 27(4), pp.532-537.

Szarpak L, Rafique Z, Gasecka A, Chirico F, Gawel W, Hernik J, Kaminska H, Filipiak KJ, Jaguszewski MJ, Szarpak L. A systematic review and meta-analysis of effect of vitamin D levels on the incidence of COVID-19. Cardiol J. 2021;28(5):647-654. doi: 10.5603/CJ.a2021.0072. Epub 2021 Jul 26. PMID: 34308537; PMCID: PMC8428943.

Teshome A, Adane A, Girma B, Mekonnen ZA. The Impact of Vitamin D Level on COVID-19 Infection: Systematic Review and Meta-Analysis. Front Public Health. 2021 Mar 5;9:624559. doi: 10.3389/fpubh.2021.624559. PMID: 33748066; PMCID: PMC7973108.

Vaughan, Megan et al. “Changes in 25-hydroxyvitamin D levels post-vitamin D supplementation in people of Black and Asian ethnicities and its implications during COVID-19 pandemic: A systematic review.” Journal of human nutrition and dietetics : the official journal of the British Dietetic Association, 10.1111/jhn.12949. 6 Oct. 2021, doi:10.1111/jhn.12949

Wang MX, Gwee SXW, Pang J. Micronutrients Deficiency, Supplementation and Novel Coronavirus Infections-A Systematic Review and Meta-Analysis. Nutrients. 2021 May 10;13(5):1589. doi: 10.3390/nu13051589. PMID: 34068656; PMCID: PMC8151981.

Wang Z, Joshi A, Leopold K, Jackson S, Christensen S, Nayfeh T, Mohammed K, Creo A, Tebben P, Kumar S. Association of vitamin D deficiency with COVID-19 infection severity: Systematic review and meta-analysis. Clin Endocrinol (Oxf). 2022 Mar;96(3):281-287. doi: 10.1111/cen.14540. Epub 2021 Jul 12. PMID: 34160843; PMCID: PMC8444883.