You have to be careful with supplemental zinc. I do take it (25 mg picolinate) but with 50 mg or more daily you can end up with copper deficiency. So if you combine a zinc supplement with a multivitamin with significant zinc you could be in the danger zone.
Dr. Z’s protocol calls for 220 mg. zinc sulfate. Since there are a lot of other forms, he specifies 50 mg. of ELEMENTAL zinc, so one has to do a bit of calculating. This is for the treatment of Covid type illness for 5 to 7 days, so not for a long period of time.