As a subject matter expert in comic book lore and superhero fiction, I can tell you that in the DC Comics universe, Kryptonite is a fictional mineral originating from the planet Krypton, Superman's home world. There are several varieties of Kryptonite, each with different effects on Kryptonians, which include Superman and his relatives.

The yellow Kryptonite, specifically, is known to cause memory loss in Kryptonians who are exposed to it. It can strip them of their memories, making them forget their past, their identities, and even their powers. This type of Kryptonite is particularly dangerous because it can leave a Kryptonian vulnerable and disoriented.

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Gold kryptonite is a rare form of kryptonite that can negate a Kryptonian's healing factor under a yellow sun, and will remove their powers forever. It sometimes colloquially referred to as "Gold K".read more >>