Side-by-Side Comparison
Essential Vitamins & Minerals
Iodine (Elemental I) vs. Selenium (Elemental Se)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Iodine (Elemental I)
Selenium (Elemental Se)
Iodine is an essential halogen trace element required exclusively as an essential structural component of thyroid hormones thyroxine (T4) and triiodothyronine (T3), regulating metabolic rate, cellular respiration, and fetal neurodevelopment. Adult RDA is 150 µg, with an Upper Limit of 1,100 µg/day.
Selenium is an essential trace element incorporated as Selenocysteine (the 21st amino acid) into 25 human selenoproteins including Glutathione Peroxidases (GPx) and Iodothyronine Deiodinases (T4->T3 conversion). Adult RDA is 55 µg, with a Tolerable Upper Limit of 400 µg/day.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Essential Trace Halogen Element | Essential Trace Element |
|
Adult RDA / RDI
|
150 µg / day (220 µg pregnancy / 290 µg lactation) | 55 µg / day (60 µg pregnancy, 70 µg lactation) |
|
Tolerable Upper Limit (UL)
|
1,100 µg / day (Avoid Wolff-Chaikoff thyroid autoregulatory shutdown) | 400 µg / day (Avoid selenosis / garlic breath, hair/nail brittleness) |
|
Chemical Forms
|
Iodide (I- / Potassium Iodide KI, Potassium Iodate KIO3 in iodized salt), Molecular Iodine | Selenomethionine (Plant organic), Selenocysteine (Animal selenoprotein), Sodium Selenite / Selenate (Inorganic) |
|
Primary Biological Function
|
Constituent of Thyroxine (T4, 4 iodine atoms / 65% by weight) and Triiodothyronine (T3, 3 iodine atoms / 59% by weight) | Glutathione Peroxidase (GPx1-4) lipid hydroperoxide neutralization, Iodothyronine Deiodinases (Converts thyroid T4 into active T3), Thioredoxin Reductase (TXNRD) |
|
Deficiency Condition
|
Endemic Goiter (Compensatory thyroid enlargement), Congenital Hypothyroidism / Cretinism (Permanent neurodevelopmental impairment), Maternal miscarriages | Keshan Disease (Endemic juvenile cardiomyopathy), Kashin-Beck Disease (Deforming osteoarthropathy), Impaired thyroid metabolism |
|
Top Whole Food Sources
|
Kombu Kelp, Nori Seaweed, Atlantic Cod, Eastern Oysters, Iodized Table Salt, Greek Yogurt, Dairy Milk, Eggs | Brazil Nuts (1 single nut provides ~70–90µg / 130–160% RDA), Eastern Oysters, Yellowfin Tuna, Halibut, Sardines, Beef Liver, Eggs |
|
Iodized Salt Public Health Impact
|
Universal salt iodization (45–75 mg KI / kg salt) is hailed as one of the greatest global public health achievements, eradicating cretinism worldwide | — |
|
Soil Selenium Geographical Variability
|
— | Plant selenium reflects regional soil content; volcanic soils (South America, Great Plains) are rich, while parts of China, Scandinavia, and New Zealand are depleted |
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