I know Kryptonite is stated to be very rare on Earth but surely the very rich/powerful (presidents, monarchs) would have carried it everywhere to protect them from skin cancer?

Was it just the risk to Superman that prevented them from using it? (e.g. saving from natural disasters, automobile accidents and supervillains) or is there some inherent danger in constant exposure?

Is there a canonical use of kryptonite as some form of radiotherapy/cancer treatment?

  • 3
    Kryptonite affected humans in a manner similar to radiation, namely causing cancer, so it would not help them at all. Lex Luthor lost a hand to cancer because he wore a kryptonite ring to protect him from Superman. Also, kryptonite doesn't prevent the absorption of radiation so much as it draws the energy out of Superman's cells.
    – Phyneas
    Aug 29, 2015 at 2:26
  • 4
    Because more conventional sunscreen exists?
    – Golden Cuy
    Aug 29, 2015 at 2:30

1 Answer 1


Your question is an improper understanding of the findings of previous questions regarding Kryptonite and its affects on Kryptonian physiology. See: Why, exactly, does Kryptonite hurt Superman?

  • Kryptonite affects Kryptonian physiology by forcing stored solar radiation, used as a catalyst for superhuman feats, out of the cells of Kryptonians who are under a yellow sun.

  • During this event, the Kryptonian cannot perform feats of superhuman activity and can only writhe helplessly unless rescued by a third party.

  • This effect is damaging to Kryptonian physiology and acts as a deadly exposure to radiation would on human beings, eventually killing the Kryptonian in as little as an hour.

enter image description here

This effect does not happen to humans exposed to Kryptonite because Human cells do not absorb solar radiation for feats of superhuman capability.

  • Kryptonite, instead acts as a mildly radioactive substance eventually CAUSING cancer if a Human is exposed to it for an extended period.

  • Lex Luthor, in the previous DC continuity developed cancer after wearing Kryptonite as a piece of jewelry to harass Superman.

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.