Tv Tropes never fails to make me bang my head against the wall. This is an understandable question to have, but no one seems to have figured it out. Nothing is stopping you from searching "how is iodine produced?"
It's Seaweed. There's iodine in seaweed. If you accept that Kelson is making all that morphine from poppies, it's not a stretch by movie logic that he makes his iodine from seaweed.






















