Initially Posted: 11/15/2016 | Last Updated: 06/20/2020
Potassium Iodide and Potassium Iodate Seals of Approval

Alphabetical list of potassium supplement brands compared in this report

Puritan's Pride Potassium

Nature's Bounty Potassium Gluconate

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Vitamin World Potassium 99 mg

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Solgar Potassium

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NOW Potassium Chloride Powder

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Natural Factors Potassium Citrate

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CVS/pharmacy Potassium Gluconate 595 mg

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BulkSupplements.com Potassium

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Country Life Magnesium Potassium Aspartate

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DaVinci Laboratories of Vermont Potassium Aspartate+

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GNC Potassium Plus 99 mg

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Member's Mark [Sam's Club] Potassium

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Nature's Sunshine Combination Potassium

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PipingRock.com Potassium Citrate

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Rexall [Dollar General] Potassium

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Solaray Potassium

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Swanson Ultra Potassium Citrate

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Vitacost Potassium & Magnesium

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If you use a potassium supplement, it's important that you choose a product with the right dose that safely delivers what it claims. But beware: We discovered arsenic contamination in pills from a popular brand, and the labeling on some supplements can mislead you into thinking you are getting a lot more potassium than you really are. In our potassium supplement review we tell you what to expect from these products. Moreover, we identify several brands that contained what they claimed, did not exceed strict contamination limits for arsenic, lead, or cadmium and properly released their ingredient. We also found that you can get high quality potassium for a little as 1 cent per dose, rather than spending many times more. Potassium supplements treat and prevent potassium deficiency, which can occur due to diuretic drugs ("water pills"), prolonged vomiting, diarrhea or laxative abuse. Potassium may also help reduce hypertension -- particularly in people who consume too much sodium. You must be a ConsumerLab.com member to get the full test results along with ConsumerLab.com's recommendations and quality ratings of potassium supplements — including potassium-magnesium combinations. You will get results for 16 supplements — 11 selected by ConsumerLab.com and five which passed testing in our voluntary Quality Certification Program, as well as information about two supplements similar to one that passed testing.  In this comprehensive review, you'll discover:
  • Which potassium supplements passed and which failed our testing
  • Which potassium supplements offer the best value and are CL's Top Picks
  • Direct comparisons and quality ratings of potassium supplements
  • The pros and cons of different forms of potassium (such as potassium chloride, potassium citrate, and potassium gluconate) and dosage forms (such as pills and powders) 
  • Dosing of potassium for specific uses
  • How to avoid being misled by labels on potassium supplements  
  • Food sources of potassium  
  • Potential side-effects and concerns with potassium 

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