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.
That will result in Cu deficiency over any lengthy interval...
Also, I wanted to point out that, although Dr. Z stipulates a limited-duration regimen, many people will see 50 mg zinc and take that amount until it runs out.