Cost per serving
$0.06
Avg·−45%mineral · 59 active deals
Every Potassium deal here is ranked by cost per dose— what you actually pay per serving, not the sticker price. Forms and absorption differ, so the cheapest bottle isn’t always the cheapest dose.
Right now the best value across our full Potassium catalog is at $0.02 per serving.
Recommended daily intake
No upper limit from food, but supplemental potassium is capped by law (~99 mg/pill) and risky in kidney disease. General FDA/NIH adult guidance — not medical advice.
Potassium is an essential nutrient and the most abundant cation inside cells; it is required for normal cell function through its role in maintaining intracellular fluid volume and the transmembrane electrochemical gradient, and that gradient is required for proper nerve transmission, muscle contraction, and kidney function. Because of these wide-ranging roles, the fact sheet notes that insufficient intake can raise blood pressure, kidney stone risk, bone turnover, urinary calcium excretion, and salt sensitivity. It has been studied in relation to hypertension and stroke, kidney stones, bone health, and blood glucose control and type 2 diabetes; the NIH notes that most clinical trials suggest potassium supplementation lowers blood pressure (especially in people with hypertension) and that higher potassium intakes have been associated with lower stroke risk, but findings across reviews are inconsistent and the evidence is mixed, so more research is needed before firm conclusions can be drawn. Some research also suggests potassium citrate may reduce hypercalciuria and kidney stone risk and that dietary potassium may benefit bone, though the proposed mechanisms often involve citrate or co-occurring nutrients rather than potassium itself, so its independent contribution cannot be determined — per the NIH Office of Dietary Supplements; not medical advice.
In dietary supplements, potassium is often present as potassium chloride, but many other forms are also used, including potassium citrate, phosphate, aspartate, bicarbonate, and gluconate; the Supplement Facts label lists the amount of elemental potassium, not the weight of the whole compound, and most products are limited to about 99 mg per serving. The fact sheet states that only a few studies have examined how well these forms are absorbed: a 2016 trial found humans absorb about 94% of potassium gluconate, similar to potassium from potatoes, while liquid potassium chloride is absorbed within a few hours and enteric-coated potassium chloride tablets are not absorbed as rapidly as liquid forms. It also notes that, for bone health, alkaline potassium salts such as potassium bicarbonate or citrate (but not potassium chloride) may help counter dietary acid load.
Potassium is found in a wide variety of plant and animal foods and in beverages: many fruits and vegetables are excellent sources, as are some legumes (e.g., soybeans) and potatoes, while meats, poultry, fish, milk, yogurt, and nuts also contain it. Among starchy foods, whole-wheat flour and brown rice are much higher in potassium than their refined counterparts. Some of the richest selected foods listed include dried apricots (½ cup, 755 mg), cooked lentils (1 cup, 731 mg), mashed acorn squash (1 cup, 644 mg), dried prunes (½ cup, 635 mg), and a baked potato (1 medium, 610 mg) — per the NIH Office of Dietary Supplements.
Insufficient potassium intakes can increase blood pressure, kidney stone risk, bone turnover, urinary calcium excretion, and salt sensitivity, and severe deficiency can cause hypokalemia (serum potassium below about 3.6 mmol/L); mild hypokalemia is characterized by constipation, fatigue, muscle weakness, and malaise, while moderate to severe cases can cause muscular paralysis, cardiac arrhythmias, and can be life threatening. Groups more likely to have poor potassium status include people with inflammatory bowel diseases (such as Crohn's disease and ulcerative colitis), people who use certain medications including diuretics and laxatives, and people with pica (e.g., eating clay) — per the NIH Office of Dietary Supplements.
In healthy people with normal kidney function, high dietary potassium intakes do not pose a health risk because the kidneys eliminate excess in the urine, and the NASEM committee did not set a Tolerable Upper Intake Level (UL) for potassium because the evidence was deemed insufficient. However, in people with impaired potassium excretion (e.g., chronic kidney disease or use of ACE inhibitors or potassium-sparing diuretics), even intakes below the AI can cause hyperkalemia, whose severe cases can cause muscle weakness, paralysis, heart palpitations, paresthesias, and potentially life-threatening cardiac arrhythmias — per the NIH Office of Dietary Supplements.
Cost per serving
$0.06
Avg·−45%Cost per serving
$0.08
Avg·−35%Cost per serving
$0.08
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$0.14
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$0.14
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$0.38
Cost per serving
$0.06
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$0.08
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$0.23
PriceyCost per serving
$0.08
Avg·−34%Cost per serving
$0.06
Avg·−46%Cost per serving
$0.05
Avg·−54%Cost per serving
$0.09
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$0.04
Avg·−63%Cost per serving
$0.09
PriceyCost per serving
$0.26
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$0.16
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$0.07
Avg·−40%Cost per serving
$0.06
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$0.06
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$0.15
Cost per serving
$0.13
Cost per serving
$0.08
Avg·−33%Cost per serving
$0.05
Avg·−57%HerbsPro · 🍌 Potassium
CPS
Price
$16.20
HerbsPro · 🍌 Potassium
CPS
Price
$19.99
HerbsPro · 🍌 Potassium
CPS
Price
$8.02
HerbsPro · 🧂 Iodine
CPS
Price
$34.65
HerbsPro · 🧂 Iodine
CPS
Price
$12.95
HerbsPro · 🧂 Iodine
CPS
Price
$5.25
HerbsPro · 🍌 Potassium
CPS
Price
$15.19
HerbsPro · 🍌 Potassium
CPS
Price
$15.05
HerbsPro · 🍌 Potassium
CPS
Price
$6.99
HerbsPro · 🍌 Potassium
CPS
Price
$8.06
HerbsPro · 🍌 Potassium
CPS
Price
$6.45
HerbsPro · 🍌 Potassium
CPS
Price
$5.20
HerbsPro · 🍌 Potassium
CPS
Price
$8.59
HerbsPro · 🍌 Potassium
CPS
Price
$3.99
HerbsPro · 🍌 Potassium
CPS
Price
$9.49
HerbsPro · 🧂 Iodine
CPS
Price
$15.37
HerbsPro · 🧂 Iodine
CPS
Price
$9.45
HerbsPro · 🍌 Potassium
CPS
Price
$14.39
HerbsPro · 🍌 Potassium
CPS
Price
$14.21
HerbsPro · 🍌 Potassium
CPS
Price
$5.51
HerbsPro · 🧂 Iodine
CPS
Price
$17.86
HerbsPro · 🧂 Iodine
CPS
Price
$13.36
HerbsPro · 🍌 Potassium
CPS
Price
$8.28
HerbsPro · 🍌 Potassium
CPS
Price
$5.35
Dosage, upper-limit, deficiency and interaction facts are sourced from the NIH Office of Dietary Supplements Potassium fact sheet. General information, not medical advice.