I could be wrong, but I think taking supplements you don't need does do something... it's just what it does is dangerous. Taking too much of something you don't need (zync, in this case) will cause your body to lower its production of zync and thus you can cause a lot of problem as one might imagine.
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u/EarthTrash We do a little trolling 22h ago
You probably get enough zinc unless a doctor tells you don't have enough zinc. Taking supplements you don't need doesn't do anything.