First keep in mind that Lead will halt your peristalsis.
The IP6 does a good job during the night so by the time I wake up there are no black marks under my eyes. If I don’t take Lugol’s it stays that way most/all of the day. However 40m after my Lugol’s dosage the black is back and from tests it is Lead and some old Amalgam. I then take TLC a lead chelator followed by my Selenium intake and this stays fine most of the day. By mid afternoon I need another dose of TLC.
In short the Iodine continues to leach Heavy Metals from the tissue, if this is lead then expect constipation…