Gold Kryptonite is a fictional substance from the Superman comic book universe. It is a variant of Kryptonite, the mineral that weakens Superman and other Kryptonians. Unlike other forms of Kryptonite, which can harm or incapacitate Superman, gold Kryptonite permanently removes his superpowers. In the stories, gold Kryptonite is often depicted as a greenish-gold mineral. Its effects are irreversible, meaning that once a Kryptonian is exposed to it, they lose their abilities forever. This makes gold Kryptonite one of the most dangerous forms of Kryptonite for Superman and his kind.