Reference research papers and studies provided for convenience:

2020 Covid-19 Lungs, Vit D & Melatonin Gimenez V, Tajer C, Mariani J, Ferder L, Reiter R, Manucha W

2020 Evidence that Vitamin D Supplementation could reduce risk of Influenza and COVID-19 infections and deaths Grant W, Lahore, H, McDonnell, S, Baggerly C, French C, Aliano J and Bhattoa H

2020 Low Covid 19 Mortality in countries south of latitude 35 deg N supports Vit D as a factor determining severity Rhodes J, Subramanian S, Laird E and Kenny R

2020 Vitamin D supplementation could possible improve clinical outcomes of patients infected with Coronavirus-2019 Alipio M

2018 Role of Vitamin A in the Immune System Huang ZY, Liu Y, Qi GY, Brand D and Zheng SG

2018 Selenium, Selenoproteins, and Immunity Avery JC and Hoffmann PR

2018 Vitamin D in Human Immunodeficiency Virus Infection Jimenez Sousa M, Martinez I, Medrano L, Fernandez Rodriguez A and Resino S

2017 Autonomic regulation of the immune system in cardiovascular disease Abboud F and Singh M

2017 Vitamin C and Immune Function Carr A and Maggini S

2017 Vitamin D protects against colds and flu, finds major global study University of Queen Mary London

2017 Vitamin D Status and the Host Resistance to Infection Olivier Lang P and Aspinall R

2016 Biological explanation for wheat sensitivity found Columbia University Medical Centre

2016 Roles of Zinc Signaling in the Immune System Hoyjo S and Fukada T

2016 Vitamin D and Lung Infection Cantorna M

2014 Neural control of the immune system Sundman E and Olofsson P

2013 The Dietary Intake of Wheat and other Cereal Grains and Their Role in Inflammation Punder K and Pruimboom L

2013 Vitamin C for preventing and treating the common cold Hemila H

2013 Zinc helps against infection by tapping brakes in immune response Ohio State University

2011 Vitamin D and the Immune System Aranow C

2011 Vitamin D and the anti-viral state Beard J, Bearden A and Striker R

2010 Overview of the Immune System & Supplements Drake V

2008 The influence of selenium on immune response Hoffmann P and Berry M

2008 Zinc in Human Health Effect of Zinc on Immune Cells Prasad A

2001 Principles of innate and adaptive immunity Janeway CA Jr, Travers P, Walport M and et al