Note: The following information is not intended to diagnose, treat, cure or prevent any disease. I do not hold a degree in medicine and I do not claim to be an expert in this field. Consult your doctor and/or follow the advice from your local health authority if you are unwell, and be aware that nutrients may potentially interact with prescription medications, for those who take them.

Natural Ways to Strengthen Your Immunity and Health - A broad spectrum of nutrients is associated with strengthening your immune system and boasting your health, but today, I will concentrate on five key nutrients: namely, zinc, flaxseed, vitamin D, turmeric and vitamin C.

Sources

A H Shankar, A S Prasad (1998) Zinc and immune function: the biological basis of altered resistance to infection, The American Journal of Clinical Nutrition, 68:2, 447S–463S - https://doi.org/10.1093/ajcn/68.2.447S
CANNELL, J., VIETH, R., UMHAU, J., HOLICK, M., GRANT, W., MADRONICH, S., . . . GIOVANNUCCI, E. (2006). Epidemic influenza and vitamin D. Epidemiology and Infection, 134(6), 1129-1140 https://www.cambridge.org/core/journals/epidemiology-and-infection/article/epidemic-influenza-and-vitamin-d/C4D90C6E7CB127E6DF7A52D3A9EE2974#fndtn-information
Chuck CP, Chong LT, Chen C, Chow HF, Wan DCC, et al. (2010) Profiling of Substrate Specificity of SARS-CoV 3CLpro. PLOS ONE 5(10): e13197. https://doi.org/10.1371/journal.pone.0013197
Harvard Medical School (May 17 2019) Vitamin D and your health: Breaking old rules, raising new hopes https://www.health.harvard.edu/staying-healthy/vitamin-d-and-your-health-breaking-old-rules-raising-new-hopes
Hewlings, S. J., & Kalman, D. S. (2017). Curcumin: A Review of Its' Effects on Human Health. Foods (Basel, Switzerland), 6(10), 92. https://doi.org/10.3390/foods6100092 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664031/
J. Mark Davis, E. Angela Murphy, Martin D. Carmichael, Mark R. Zielinski, Claire M. Groschwitz, Adrienne S. Brown, J. David Gangemi, Abdul Ghaffar, and Eugene P. Mayer (2007) Curcumin effects on inflammation and performance recovery following eccentric exercise-induced muscle damage, American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 292:6 https://journals.physiology.org/doi/full/10.1152/ajpregu.00858.2006
Kim, Y., Kim, H., Bae, S., Choi, J., Lim, S. Y., Lee, N., Kong, J. M., Hwang, Y. I., Kang, J. S., & Lee, W. J. (2013). Vitamin C Is an Essential Factor on the Anti-viral Immune Responses through the Production of Interferon-α/β at the Initial Stage of Influenza A Virus (H3N2) Infection. Immune network, 13(2), 70–74. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3659258/
Moghaddam, S. J., Barta, P., Mirabolfathinejad, S. G., Ammar-Aouchiche, Z., Garza, N. T., Vo, T. T., Newman, R. A., Aggarwal, B. B., Evans, C. M., Tuvim, M. J., Lotan, R., & Dickey, B. F. (2009). Curcumin inhibits COPD-like airway inflammation and lung cancer progression in mice. Carcinogenesis, 30(11), 1949–1956. https://doi.org/10.1093/carcin/bgp229
NHS, How to get vitamin D from sunlight - https://www.nhs.uk/live-well/healthy-body/how-to-get-vitamin-d-from-sunlight/
NHS – Vitamin C - https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-c/
NHS - Vitamin D - https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/
NHS - Zinc - https://www.nhs.uk/conditions/vitamins-and-minerals/others/
Parikh, M., Maddaford, T. G., Austria, J. A., Aliani, M., Netticadan, T., & Pierce, G. N. (2019). Dietary Flaxseed as a Strategy for Improving Human Health. Nutrients, 11(5), 1171. https://doi.org/10.3390/nu11051171
Price, C. 14 (Aug. 2017) Science History Institute - The Age of Scurvy - https://www.sciencehistory.org/distillations/the-age-of-scurvy
Scott A Read, Stephanie Obeid, Chantelle Ahlenstiel, Golo Ahlenstiel, (2019) The Role of Zinc in Antiviral Immunity, Advances in Nutrition, 10:4, 696–710 - https://doi.org/10.1093/advances/nmz013
Seri Jo, Suwon Kim, Dong Hae Shin & Mi-Sun Kim (2020) Inhibition of SARS-CoV 3CL protease by flavonoids, Journal of Enzyme Inhibition and Medicinal Chemistry, 35:1, 145-151, https://www.tandfonline.com/doi/full/10.1080/14756366.2019.1690480

Image Credits:

Macrophages begin to fuse with, and inject its toxins into, the cancer cell - Dr. Raowf Guirguis. National Cancer Institute, Susan Arnold (photographer), http://visualsonline.cancer.gov/about.cfm https://bit.ly/2UPEvEo
A scanning electron microscope image from normal circulating human blood - National Cancer Institute Bruce Wetzel (photographer). Harry Schaefer (photographer) http://visualsonline.cancer.gov/about.cfm https://bit.ly/2JwBtQb
Vitamin D biosynthesis Hbf878 https://bit.ly/3aFMtXo
Simple Periodic Table Chart, Offnfopt - https://bit.ly/343Wc7q