Hey, in this demension they have cornered and hid all known quantities of Kryptonite. They also did not destroy it in a way that might infect the water supply.
I really do not see what Clark could do more than he has done. Kryptonite hurts, so I see no reason for him to test his endurance. He does not yet have a trusted professor-friend like Dr. Klein or Dr. Hamilton to work with on this issue.
I think even Dr. Lane is in hiding.
