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Well, the basic idea behind it is that it is material from his home planet... and on his own planet, he *isn't* a superhero... he's just normal. So, being around material similar to himself can take away his special powers. Now, of course there is a lot more to it through different Superman storylines, but that is the closest I can get to "why." ...

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16y ago
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13y ago

Because that is what the author wanted it to be.

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Q: Why is Supermans weakness kryptonite?
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