Side-by-Side Comparison Essential Vitamins & Minerals

Potassium (Elemental K) vs. Selenium (Elemental Se)

Comparing 2 standards across 10 specifications. 10 key differences identified.

Comparing:

Potassium (Elemental K)

Selenium (Elemental Se)

Highlight Diffs (10)

Potassium is the primary intracellular cation (140 mEq/L intracellular vs 4 mEq/L extracellular), maintaining the cellular resting membrane potential via the Na+/K+-ATPase pump and regulating vascular tone. Adequate Intake (AI) is 3,400 mg (men) / 2,600 mg (women).

View full Potassium (Elemental K) spec sheet →

Selenium (Elemental Se) →

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.

View full Selenium (Elemental Se) spec sheet →

Specification Comparison Table

10 Parameters

Parameter / Spec	Potassium (Elemental K)	Selenium (Elemental Se)
Nutrient Type	Essential Macromineral / Major Intracellular Electrolyte	Essential Trace Element
Tolerable Upper Limit (UL)	None Established (Whole foods; healthy kidneys clear excess; renal impairment requires clinical restriction)	400 µg / day (Avoid selenosis / garlic breath, hair/nail brittleness)
Chemical Forms	Potassium Citrate, Potassium Chloride (KCl / Salt substitute), Potassium Gluconate	Selenomethionine (Plant organic), Selenocysteine (Animal selenoprotein), Sodium Selenite / Selenate (Inorganic)
Primary Biological Function	Na+/K+-ATPase resting membrane potential (-70mV), Cardiac myocardial repolarization, Endothelial nitric oxide vasodilation (lowers blood pressure), Blunts sodium-induced fluid retention	Glutathione Peroxidase (GPx1-4) lipid hydroperoxide neutralization, Iodothyronine Deiodinases (Converts thyroid T4 into active T3), Thioredoxin Reductase (TXNRD)
Deficiency Condition	Hypokalemia (Serum K+ < 3.5 mmol/L): Cardiac arrhythmias (U-waves, ventricular tachycardia), Muscle weakness, Ileus, Hypertension	Keshan Disease (Endemic juvenile cardiomyopathy), Kashin-Beck Disease (Deforming osteoarthropathy), Impaired thyroid metabolism
Top Whole Food Sources	Baked Russet Potato (with skin), Orange Sweet Potato, Spinach, Bananas, Atlantic Salmon, Black Beans, Hass Avocado, Coconut Water	Brazil Nuts (1 single nut provides ~70–90µg / 130–160% RDA), Eastern Oysters, Yellowfin Tuna, Halibut, Sardines, Beef Liver, Eggs
Adult Adequate Intake (AI)	3,400 mg / day (Men) / 2,600 mg / day (Women) (WHO Target: >3,510 mg/day)	—
Dietary Sodium-to-Potassium Ratio	Ancestral human ratio was 1:4 (Na:K); modern Western diets average 2:1, significantly contributing to hypertension	—
Adult RDA / RDI	—	55 µg / day (60 µg pregnancy, 70 µg lactation)
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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Potassium (Elemental K) vs. Selenium (Elemental Se)

Specification Comparison Table

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