I have added Zinc to my regimen recently. I also added vitamin C. I already take a fair amount of vitamin D3. I take 3 different types of B12 for my diabetic nerve pain/numbness (99% controlled by B12).
I would strongly recommend adding quercetin phytosome to your supplement intake. Quercetin is a zinc ionophore like hydroxychloroquine...and helps zinc penetrate the cellular membrane and enter into the cytosol to prevent the virus from making an RNA dependent RNA polymerase to replicate itself. Zinc virtually stops the virus from hijacking the mechanisms within the cell that control replication.
https://m.youtube.com/watch?feature=share&v=U7F1cnWup9M