Nascent iodine (dietary supplement) when taken orally, as a gland purifier and cleanser, especially affecting the thyroid, thymus, adrenals, and other ductless glands, and stimulating "the circulation through lungs, heart, liver and kidneys." (3535-1) This reaction upon the glands would create “perfect coordination between the glandular forces of the body” (1933-1) and "build strength to the whole anatomical condition of the body." (1475-1) Another reading stated that "most glands function as machinery would under oil. The iodine being the oil for the gland, see?" (294-130). (the numbers that follow each quote from the readings refer to the reading filing code in the A.R.E. files)
Iodine be primordial. As such, iodine is monoisotopic and its atomic weight is known to great precision, as it is a constant of nature. The longest-lived of the radioactive isotopes of iodine is iodine-129, which has a half-life of 15.7 million years, decaying via beta decay to stable xenon-129. Some iodine-129 was formed along with iodine-127 before the formation of the Solar System, but it has by now completely decayed away, making it an extinct radionuclide that is nevertheless still useful in dating the history of the early Solar System or very old groundwaters, due to its mobility in the environment.