Here's why:
* Kryptonite's effects are complex: Kryptonite doesn't just "weaken" Superman. It disrupts his cells and powers, making him vulnerable to injury, sickness, and even death depending on the type of kryptonite.
* No element can counteract that: While some elements might be able to shield against radiation, they wouldn't be able to reverse the cellular damage caused by kryptonite.
So, what can protect Superman?
* Lead: Lead is the most common material used to shield Superman from kryptonite's radiation.
* Special suits: Superman has worn suits made of kryptonite-resistant materials, but these are not always foolproof.
* Magic: Some forms of magic can temporarily negate kryptonite's effects.
In essence, there's no one-size-fits-all solution to protect Superman from kryptonite. It's a multifaceted threat that requires creative and often temporary solutions.