Actually, I only found out about it from Charlie. He said he gave it along with B12 shots ( the B vitamins work synergistically with Iodine). What I use is the liquid solution in water.
From what I have been reading, even in developed countries people are deficient in iodine due to the fact that the process of the way food has been made has changed and the fact that chlorine and other chemicals have been added into the water systems. Although the teaspoon amount that your thyroid makes each year is a small amount it preforms a massif function throughout your entire body.
Conversely, in Japan, they eat food that rich in Iodine everyday and some correlate this with the reason as to why Japanese are most healthiest people in the world (that we know of).
Anyhow, so far my sleep has changed. I rest better and I sleep deeper. Of course, this could be a placebo effect like the other poster said but as an athlete I’m really in tune with my own body.
Edit: Everybody should have a bottle of iodine at their home anyway because if a nuclear plant has an “accident” you can take Iodine to protect your glands from radioactive fall out.