Why zinc for Covid-19?

When I was in the hospital with Covid-19,  I was given three supplements along with my medications.  They were Vitamin C,  Vitamin D3,  and Zinc.  I was sent home with them as well.   According to some research I did, zinc is said to  help the white blood cells fight and stop invaders from spreading in our bodies.  Zinc also helps decrease stuffiness, congestion, sneezing, and a runny nose by inhibiting the release of histamines that trigger those symptoms.  According to Advanced Bionutritionals,  ionic zinc is more effective than non-ionic zinc and zinc acetate is the best form to use.  (Second best would be zinc gluconate.) Zinc is most effective when invaders are exposed to zinc for at least 20 minutes at a time.  Slow dissolving tablets are more effective than pills, syrups, or sprays.   More information can be found on www.advancedbionutritionals.com/zinc-acetate/