There are two forms of topical iodine available that should NOT be taken internally:
(1) Povidone Iodine: It is a mixture of polyvinylpyrrolidone (P.V.P.) and elemental iodine.
(2) Tincture Iodine: It is usually close to 50% alcohol and stings.
Instead, take one of these two forms:
(1) Lugol’s iodine: It comes in either a 2% or 5% solution. You can use either, just dilute them in drinking water.
(2) Potassium iodine: It comes in tablets often ranging between 12.5mg and 130mg.
And to save you the trouble, here are the links to them directly on Amazon:
https://www.amazon.com/Optimox-Iodoral-Potency-Potassium-Supplement/dp/B003PQRQPS/ref=sr_1_2_s_it?s=hpc&ie=UTF8&qid=1547274953&sr=1-2-spons&keywords=iodoral&smid=A5W198TSQJIXA&th=1
https://www.amazon.com/J-Crows-Lugols-Solution-2/dp/B004VM167Y/ref=sr_1_13_a_it?ie=UTF8&qid=1547275039&sr=8-13-spons&keywords=j+crow%27s+lugol%27s+solution+2&psc=1