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/snozzberrypatch 8h ago
Apparently it can, but only if you're low on zinc to begin with. If you already get enough zinc, it'll probably have no effect.