First, I want to say I've made fantastic progress in fighting my condition, thanks in no small part to guidance from this forum. At some point, I'll post with my story, but these are busy days and for now I just popped in with a thought.
I know many people struggle to absorb Mg here, and it just occured to me: perhaps one could deliver Mg to the heart by spritzing it into the lungs via some kind of inhaler (or even just a spray bottle)?
Now, I know NOTHING about how the lungs would respond to having Mg in them, nor do I know how effectively Mg would be absorbed by the lungs, so DON'T go and try this at home or anything. But I wanted to raise the possibility for discussion, because blood is carried directly from the lungs back to the heart, in a very short trip. So, if it were safe, and if Mg were absorbed effectively in the lungs, it might be a good way to get a high dose to the heart, or at least to part of the heart.
Just brainstorming. Apologies if there is something terribly stupid about the idea. I didn't screen my idea for stupidity prior to posting.