Side-by-Side Comparison
Essential Vitamins & Minerals
Selenium (Elemental Se) vs. Vitamin B9 (Folate & Folic Acid)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
Selenium (Elemental Se)
Vitamin B9 (Folate & Folic Acid)
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.
Vitamin B9 comprises natural dietary folates (polyglutamates) and synthetic folic acid (monoglutamate). Adult RDA is 400 µg DFE, with a Tolerable Upper Limit of 1,000 µg/day synthetic folic acid, essential as a single-carbon donor in thymidylate DNA synthesis and neural tube closure.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Essential Trace Element | Water-Soluble Pteroylglutamate Vitamin |
|
Adult RDA / RDI
|
55 µg / day (60 µg pregnancy, 70 µg lactation) | 400 µg DFE / day (600 µg DFE pregnancy / prevents neural tube defects) |
|
Tolerable Upper Limit (UL)
|
400 µg / day (Avoid selenosis / garlic breath, hair/nail brittleness) | 1,000 µg / day (Synthetic folic acid only; masks B12 deficiency neuropathy) |
|
Chemical Forms
|
Selenomethionine (Plant organic), Selenocysteine (Animal selenoprotein), Sodium Selenite / Selenate (Inorganic) | (6S)-5-Methyltetrahydrofolate (5-MTHF, active circulating form), Tetrahydrofolate (THF), Folic Acid (Pteroylmonoglutamic acid, synthetic) |
|
Primary Biological Function
|
Glutathione Peroxidase (GPx1-4) lipid hydroperoxide neutralization, Iodothyronine Deiodinases (Converts thyroid T4 into active T3), Thioredoxin Reductase (TXNRD) | 1-Carbon transfer reactions, dUMP -> dTMP methylation (Thymidine DNA synthesis), Methionine-Homocysteine cycle, Erythropoiesis |
|
Deficiency Condition
|
Keshan Disease (Endemic juvenile cardiomyopathy), Kashin-Beck Disease (Deforming osteoarthropathy), Impaired thyroid metabolism | Neural Tube Defects (Spina bifida, anencephaly in fetuses), Megaloblastic Macrocytic Anemia, Elevated Homocysteine |
|
Top Whole Food Sources
|
Brazil Nuts (1 single nut provides ~70–90µg / 130–160% RDA), Eastern Oysters, Yellowfin Tuna, Halibut, Sardines, Beef Liver, Eggs | Beef Liver, Spinach, Asparagus, Brussels Sprouts, Roman Lentils, Chickpeas, Fortified Flours |
|
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 | — |
|
MTHFR Genetic Polymorphism
|
— | Homozygous MTHFR C677T variant reduces folate reduction activity by ~70%, benefiting from direct 5-MTHF supplementation |
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