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Krypton is used in different forms for many applications in the medical industry. Krypton lasers are commonly employed for laser eye surgery. The laser is used to help prevent blood clotting in the eye as surgery is performed.
Red-Green Kryptonite: Red-Green Kryptonite caused Superman to mutate, temporarily growing a third eye in the back of his head. Gold Kryptonite: Gold Kryptonite can remove Kryptonians' powers to process yellow sunlight; this kryptonite only removes a kryptonian's powers temporarily, but enough exposure can render them powerless forever.