Nice story - I like that Bernie knows the truth, now, but speaking medically it doesn't make sense. 'Normal' lead levels in humans are next to nothing. I think it might be more accurate to say 'normal' in the case of a human is the level a human can tolerate without falling victim to lead poisoning.
Also, in 'The Green, Green Glow of Home', Jason Trask says:
(Kryptonite) Emits an extremely high band radiation that doesn't seem to affect humans.
It is Superman canon that a human can be affected by kryptonite from
long term exposure. Lex Luthor sometimes has a missing hand to prove that. Even with long term exposure the level of lead in a human's body (it's a
very minute amount) wouldn't be enough to protect them from kryptonite.
Also, I'm not sure where, but I know I've read that Superman's blood is also iron based and is somewhat (only somewhat) similar to a humans. (He is sometimes even called a meta-human.) That being the case, I imagine that ingesting lead could lead to lead poisoning.
Anyway, I don't think the premise works. I
do really like the idea that some (other) kind of vitamins could help the fight against kryptonite.
Okay, now just tell the nurse
to shut up and quit looking at things from a medical standpoint.
And yes, I'm looking forward to more of your other story.