There is a method floating around the internet for a long time, and even several books talking about applying a small patch of iodine to our skin and judging how iodine deficient we are depending how quickly we absorb it. There are so many factors to this.
So, the idea is that people applied Lugols to their skin and it went away in X hours, which means their body did or didn’t need iodine.
Which strength iodine are we judging this with, because that has a lot to do with how quickly it will seem like our skin has completely absorbed it. 5% is twice as dark as 2%, and some people use even stronger blends. People buy Lugols from random people around the globe, and some of these people interpret the recipe/math differently and create different strength blends. Over time as the product ages, it becomes lighter colored as well. This means people could use what they assume is the same colored product, which is instead a completely different color, and assume one was absorbed much quicker than the other’s.
How much liquid is being used, is only a thin layer applied to the skin, or should the liquid bead up?
Do I remain motion-free to keep the liquid from running?
Do I blot the excess?
What if I have super light or super dark skin?
Are most people judging this time while their skin is tan?
What if I have lotion, oil, soap residue or self-tanner on my skin?
What if I go swimming?
What if I am very active in a humid climate vs sedentary in the cold?
What about hydration level?
What if I’m loaded with other halides that may repel iodine and cause it to be urinated?
There are a lot of other variables, like how often we poop etc, but I figure you kinda get the hint at this point. Another interesting aspect I like to point out is how I can put gasoline on my skin, and it will eventually be absorbed and evaporate, but I doubt that implies that I am low on gasoline.
I think the 24-hour urine loading test also has flaws.
And I think we’re all iodine deficient to some degree. Iodine has been removed from our diet while our diet and environment have been loaded with anti-iodine compounds. It’s not rocket math.