50mg is reccomended by both Dr Abraham and Dr Brownstein...two doctors who have used iodine extensively in practice. I'm amazed I can tolerate that much, before even a few mg would make me feel really unstable and bipolar. I think I'm finally able to tolerate it thanks to chelation, which I'm still doing 3-4 days every week. I know I really need the iodine as I had some serious prolonged exposure to bromine years back as my family had a hot tub which used bromine instead of chlorine and I used it quite often...and it did coincide with the worsening of many symptoms.

I bought the source naturals magnesium malate and the cotton ball inside smelled horrible to me and I didn't even want to take them (I do have chemical sensitivity)...otherwise I would probably use that one as well.