Green Kryptonite is a fictional mineral from the Superman comic book series. It is known as the most potent weakness of Superman, a superhero from the planet Krypton. When he comes into contact with Green Kryptonite, it weakens him, causing pain and even incapacitation. The origin of Green Kryptonite is tied to the destruction of Krypton, Superman's home planet. Fragments of this mineral were scattered across the universe, and it has since become a significant plot element in various DC Comics stories. Its effects on Superman highlight the contrast between his incredible powers and his vulnerabilities.