I will keep an eye on that Vit D.!! I know it is a hormone and not a "vitamin" and have been somewhat hesitant about it
also, thanks about the iron!
I have dark circles around my eyes, which I have had for a long time, and I've read an iron deficiency can be a cause. Of course, as you pointed out, digestion issues my underlie a lot of this, though the iron I am taking (organic iron, medicinal neutraceuticals)does seem to be helping overall, though I will go slow... and yes my digestion is a mess so the betaine HCL might be a good choice too
overall, the Iodine seems to be helping me, gradually, regain my digestion :)