This health announcement directs you to another Youtube video that has more detailed information on why getting enough vitamin D into your body before contracting the covid-19 novel virus may be beneficial in that the respiratory system may be healthier before you get that infection. See this Youtube video:
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In other words, if you have a vitamin-D deficiency in your body, it may be highly advantageous to take moderate amounts of that vitamin daily, on a regular daily basis (as long as each individual dose is not large) before you become exposed to the covid-19 virus.
