Everything in the second paragraph (except hyperkalemia being dangerous) rings false to me. Potassium ions are water-soluble, vitamin levels are regulated mostly by modulating excretion rather than absorption (pretty sure), and nothing rat-poison-like (warfarin?) is commonly used to treat hyperkalemia.

ETA: Caerbannog has a very plausible hypothesis that you're confusing vitamin K for potassium. If so you should retract your posts on the topic.