First of all, I do not condone supplementation of ANYTHING without first determining that you are, in fact, deficient in whatever you plan to supplement. Supplements can be for a short term or a long term but it is up to you to do your own research and consult with your health practitioner to determine what's right for you. Too much of a good thing may not be a good thing.
Supplements often need other supplements to help them work. Such is the case with iodine...it's buddies with selenium.
So, I fell down this particular rabbit hole doing research on my hubby after he got back his recent blood work which included a full thyroid function panel. Low and behold, they had done an iodine result in that panel and it was low. T4 was also low but everything else was within normal range but at the low end. Since we've already dragged his hemoglobin (kicking and screaming) from 9.2 mg% to 15.5 mg% using supplements of iron, B12 and folic acid, could this low thyroid function (or more specifically low iodine) be the reason for constantly being cold and fatigued and sleeping more than normal?
Please read both of the following links...what I read was unknown to me.
(half way down in the above link...the trouble is within the gland)
p.s. He's been supplementing with iodine (500 mcg daily) from kelp for a week now...sleeping less and no longer cold...level of T4 has gone up and so has iodine. Keeping an eye on it.