- Do I need potassium? Potassium is essential for the proper functioning of the nervous system, skeletal system, heart, and metabolism, as well as maintaining normal blood pressure (See What It Is). It can easily be obtained through the diet, but people taking certain drugs or with conditions affecting the kidneys or gut may be deficient (See What to Consider When Using). Low potassium is also common among people hospitalized with COVID-19, caused by the new coronavirus.
- What does potassium do? Potassium supplements are typically used only to treat or prevent potassium deficiency. Supplementing with potassium may also help to reduce high blood pressure and the risk of kidney stones (See What It Does).
- How much potassium should I take? For preventing potassium loss, potassium is often recommended at doses of 200 to 400 mg, taken 3 to 4 times daily (for a total daily dose ranging from 600 mg to 1,600 mg). For lowering blood pressure in people with hypertension, larger amounts are often used (3,000 mg per day) (See What to Consider When Using). Nearly all common forms of potassium are absorbed equally well (See What to Consider When Buying).
- Best choice of potassium supplement? CL's tests found most potassium supplements to be of high quality, but arsenic contamination was found in one product (See What CL Found). Among the products which passed testing and were Approved for quality, ConsumerLab.com identified several which represented its Top Picks.
- Safety and side effects of potassium: Potassium from supplements may cause diarrhea, nausea, stomach pain, mild gas and vomiting, which may be reduced by taking with meals. Less common side effects include confusion, irregular heartbeat and shortness of breath. People with kidney disease and people taking potassium-sparing diuretics, ACE inhibitors, or trimethoprim/sulfamethoxazole should not take potassium supplements without medical supervision (See Concerns and Cautions).
Potassium Supplements Review
Find the Best Potassium Supplement.
Avoid Arsenic Contamination and See CL's Top Picks
Alphabetical list of potassium supplement brands compared in this report
Country Life Magnesium Potassium Aspartate
CVS/pharmacy Potassium Gluconate 595 mg
DaVinci Laboratories of Vermont Potassium Aspartate+
GNC Potassium Plus 99 mg
Member's Mark [Sam's Club] Potassium
Natural Factors Potassium Citrate
Nature's Bounty Potassium Gluconate
Nature's Sunshine Combination Potassium
NOW Potassium Chloride Powder
PipingRock.com Potassium Citrate
Puritan's Pride Potassium
Rexall [Dollar General] Potassium
Swanson Ultra Potassium Citrate
Vitacost Potassium & Magnesium
Vitamin World Potassium 99 mg
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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