Kryptonite is Superman's weakness.
Kryponite can kill superman, Magic can too. But doomsday actually killed him but he came back. I hate superman though.
Blue kryptonite - it improves Superman's health and frees him from red kryptonite's unpredictable side effects. Blue kryptonite only affects Bizarro - he feels weak.
With a Kryptonite condom.
Superman has stated that the only man he's afraid of is Batman, and with good reason.
Superman is weak against kryptonite.
Kryptonite robs Superman of his strength.