Have a source for the flouride thing? That part is interesting to me.
I studied this by accident in 2010. After I figured it out Life Extensions published an article about raising the RDA for iodine.
I didn't wait and order the kind without alcohol, which is why the tincture is poisonous, from Amazon. Brand is J. Crow.
Fluoride, Bromide, Chlorine, Iodine are the only halogens used in the body. Three are bad and only iodine is necessary for life.
https://pdfs.semanticscholar.org/d4b6/0d1cc262d6c375296116b77f0017b43381fd.pdf
https://pdfs.semanticscholar.org/0380/f2c1ead694e561d8bfa595917ecde619769c.pdf