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Kryptonite: Slow Kryptonite
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Slow Kryptonite is a variety of kryptonite produced by Metallo that affects humans. Why it is called "Slow Kryptonite" is because the rays sent out by normal Kryptonite are "fast" and synced with the accelerated kryptonian body. Slow Kryptonite, which releases "slow" rays, is synced with a slow human body, allowing it to affect it.
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Kryptonite emitted a radiation that had an adverse effect on Kryptonian natives such as Superman, though different varieties of kryptonite had different effects. It was assumed for a long time that kryptonite radiation was harmless to non-Kryptonians, but occasional isolated incidents were reported where it had sporadic effects on humans. The "slow Kryptonite" version (see entry, below) offered as explanation that Kryptonite radiation was especially "fast" and could only be trapped by dense material such as Kryptonian biological tissue (itself sometimes offered as the "scientific" explanation of Superman's strength and/or invulnerability). By "slowing" this radiation, green Kryptonite could be modified to inflict pain on Earthlings.
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Slow Kryptonite: A modified variety of Green Kryptonite produced by a Terran scientist that decelerates the speed of nerve impulses and movements of both Kryptonians and Terrans. Appeared in The Brave and the Bold #177.
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Slow Kryptonite