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• Vitamin D serum levels above 35 ng/mL seem to correlate with the mortality rate of COVID-19 patients. • The majority of the Western population is deficient in Vitamin D. • Vitamin D3 supplementation also requires additional vitamin K2 intake. • The immunoregulating function of vitamin D is promising and might decrease the global epidemic mortality. The world is desperately seeking for a sustainable solution to combat the coronavirus strain SARS-CoV-2 (COVID-19). Recent research indicated that optimizing Vitamin D blood levels could offer a solution approach that promises a heavily reduced fatality rate as well as solving the public health problem of counteracting the general vitamin D deficiency. This paper dived into the immunoregulatory effects of supplementing Vitamin D 3 by elaborating a causal loop diagram. Together with D 3 , vitamin K 2 and magnesium should be supplemented to prevent long-term health risks. Follow up clinical randomized trials are required to verify the current circumstantial evidence. [ABSTRACT FROM AUTHOR]