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I have been on and off zinc 50mg daily. My GP told me that I am taking a toxic dose (50mg daily)

I notice that when I take the zinc my chronic sinus infections vanish, and then return shortly after stopping.

Also, my lymphocytes are typically low, but after starting the zinc they returned to normal.

So I am curious if others on here are on daily zinc long term and if copper is necessary at the 50mg dose