nuance:

"Why is iodized salt considered a poor and unreliable source of dietary iodine?

There are several reasons why iodized salt is not an ideal iodine source. Iodine evaporates out of salt over time, so the iodine content when consumed is much less than what is listed on the label. Iodized salt also only provides sodium iodide, while the breasts and other tissues need both iodide and elemental iodine. The sodium in iodized salt can also competitively inhibit iodine absorption in the body. Relying solely on iodized salt often does not provide optimal iodine intake."

https://unbekoming.substack.com/p/iodine

other traps are heavy metals, parasite-rich commercial feed, toxic natural chamical flavoring... all kinds of academons' food science;

there are no magic pills, no magic elements to heal all; the proper approach to pursuing indefinite longevity is endurance training and syncing up to nature:

catch sunrises & sunsets into the retinas & especially the pigmented regions - groin & nipples;

walk barefoot or use grounding shoes; work gloveless & shoeless in the garden; climb trees & rocks! avoid electrically polluted areas;

cold exposure - semiconduction works best in the cold; take cold showers, plunge into cold water, sleep with & wear fewer layers; i feel much more productive & strong in the winter, as long as i avoid the toxic feed & cozy traps;

nutrition is quite low on the list of proper longevity habits, however avoiding toxic industrial sludge is vital;