Hi Parrot,
I've only used the liquids, electrodine and most recently, Lugol's. I have
not tried the iodoral and am not likely to. The electrodine is definitely
more expensive than the Lugol's (even on sale) but it is supposedly close
to 100% bio-available (absorbable) and has negligible amounts of heavy
metals in it. I spoke with the formulator and he said that all iodines have
some heavy metal in them, a fact I did not know. There are some doctors
who are conducting a study on electrodine and other iodines and they
are saying electrodine comes out on top. The results should be available
very shortly, I'm being told.