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I don't know if that enormous dosage of zinc can enlarge your prostate, but it might well do doamage to your health.
What is referred to as the tolerable upper limit of daily dosage is 40 mg per day and you are taking 180 mg - more than four times the recommended maximum!
It is always worth looking at the scientific studies when making decisions. They may not always be correct because data accumulates over time, but they are more likely to be a good guide than something written by an author who is selling something.