Side-by-Side Comparison
Essential Vitamins & Minerals
Selenium (Elemental Se) vs. Zinc (Elemental Zn)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Selenium (Elemental Se)
Zinc (Elemental Zn)
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.
Zinc is an essential trace mineral serving as a structural component in over 2,000 transcription factor 'zinc finger' proteins and catalytic cofactor for 300+ enzymes. Adult RDA is 11mg (men) / 8mg (women), with a Tolerable Upper Limit of 40mg/day.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Essential Trace Element | Essential Trace Mineral |
|
Adult RDA / RDI
|
55 µg / day (60 µg pregnancy, 70 µg lactation) | 11 mg / day (Men) / 8 mg / day (Women) |
|
Tolerable Upper Limit (UL)
|
400 µg / day (Avoid selenosis / garlic breath, hair/nail brittleness) | 40 mg / day (Chronic excess induces copper deficiency) |
|
Chemical Forms
|
Selenomethionine (Plant organic), Selenocysteine (Animal selenoprotein), Sodium Selenite / Selenate (Inorganic) | Zinc Picolinate, Bisglycinate, Gluconate, Sulfate, Oxide |
|
Primary Biological Function
|
Glutathione Peroxidase (GPx1-4) lipid hydroperoxide neutralization, Iodothyronine Deiodinases (Converts thyroid T4 into active T3), Thioredoxin Reductase (TXNRD) | Zinc finger DNA transcription factors, Superoxide Dismutase (SOD1), Carbonic anhydrase, Testosterone synthesis, Phagocytosis |
|
Deficiency Condition
|
Keshan Disease (Endemic juvenile cardiomyopathy), Kashin-Beck Disease (Deforming osteoarthropathy), Impaired thyroid metabolism | Impaired immunity, Hypogonadism, Delayed wound healing, Alopecia, Loss of taste/smell (Anosmia/Ageusia) |
|
Top Whole Food Sources
|
Brazil Nuts (1 single nut provides ~70–90µg / 130–160% RDA), Eastern Oysters, Yellowfin Tuna, Halibut, Sardines, Beef Liver, Eggs | Eastern Oysters, Beef Chuck, Crab, Pumpkin Seeds, Hemp Hearts, Chickpeas |
|
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 | — |
|
Copper Balance Warning
|
— | High zinc stimulates intestinal metallothionein which binds copper, risking microcytic anemia if copper is unsupplemented |
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