I'd like to also insert my opinion. To me, the % Lugol's is only useful to tell you how much iodine/iodide you're getting. The amount of iodine/iodide is what matters. I add it all together, any source of iodine, any source of iodide, to get my daily amount in one number. Makes it easier to compare what I'm doing now with what I was doing last year. Sometimes it matters how much of each, but the majority of the time the total is the key.