Two places left on earth that understands human health and more apt to get an honest answer is China and Russia------the only problem is, these 2 countries do not like sharing info------iodine is the largest human health supplement there is.
In North America all the iodine supplements sold are either poisons or worthless. I have been quizzing people on the other side of the planet that make supplements for the wealthiest people on earth----and getting any info about "real" iodine seems to always draw a blank---which either means they do not know, or they do not make such a product for sale---because if they sale it, they will tell you anything if they believe you will buy it---they seem to always love AMERICAN $$$$$
You mention tree iodine and the world goes "blank" like the eyes (lights) are out.
I believe Tree Iodine is the real true organic iodine and have yet to find another human on the planet that makes such things....and when asked, they never have anything to say, they do not try to defend lugol's iodine or sea weed iodine-----they are just "blank" as though they are in an area they know nothing about.