I've heard several folks mention that b-12 can deplete potassium. A few questions: What is the basis for this hypothesis? What are the specific symptoms of b12-induced potassium deficiency? And how does one know it's from potassium depletion and not another mineral or vitamin co-factor? Do other co-factors have distinctly different symptoms? THANKS IN ADVANCE, Dan p.s. And in general, is there a specific dose of b12 that might create this depletion?