The 10 Best Potassium Supplements Backed by Dietitians in 2025

We chose Pure Encapsulations Potassium (Citrate) as the best potassium capsule because, according to several Amazon reviews, the capsules are small and easy to swallow, making it a snap to incorporate into your health routine.

It’s also hypoallergenic and free from several common allergens, including wheat, soy, dairy, eggs, tree nuts, peanuts, and gluten. This makes it a supplement that people with food sensitivities and allergies can feel comfortable taking. It’s also free from artificial colors, flavors, sweeteners, coatings, ands shellacs and unnecessary preservatives, binders, and fillers. For those looking for a supplement with a short ingredient list, this fits the bill.

We also love that Pure Encapsulations removes unnecessary plastic packaging from its supplement bottles to reduce its plastic consumption. Plus, the company partners with TerraCycle, an organization that helps recycle packaging that isn’t eligible for curbside recycling.

We loved Kind Nature Potassium Gummies because, unlike many gummy supplements that contain gelatin, they’re vegan-friendly and suitable for a wide range of dietary needs. They’re also soy- and gluten-free, so people who are sensitive to these ingredients can take this supplement.

The potassium in this supplement is in the form of potassium bicarbonate. That means that the potassium is bound to carbon and oxygen (in contrast to potassium chloride, which is bound to a chlorine molecule, or potassium citrate, which is bound to citric acid). We also loved that Kind Nature Potassium Gummies are third-party tested and produced in a CGMP-compliant, FDA-registered facility, which ensures their purity, potency, and quality.

One downside of these gummies is that there aren’t many buying options online. Unless you buy directly from the Kind Nature website or through Amazon, these gummies cost more than a dollar per dose. However, given that they’re available on Amazon, which ships to most places within the United States, we still felt they were a good choice for the best gummy potassium supplement.

When it comes to an affordable potassium supplement, it’s hard to look past Nature Made’s Potassium Gluconate. At just four cents a dose when you buy it from Amazon or Walmart, it was the least expensive potassium supplement we could find that was also third-party tested.

These tablets are gluten-free and contain no artificial flavors, added colors, or preservatives, making them a good choice for people with sensitivities.

One thing we loved about this supplement was that it wasn’t just third-party tested. It’s also United States Pharmacopeia (USP) Verified, meaning that the ingredients have been manufactured, tested, and verified according to strict standards set out by the USP. In other words, you can be sure that what you see on the label is what’s contained in your supplement.

Nature’s Bounty Potassium supplements are made with plant-based ingredients, so they’re a great option for vegans. They’re also affordable, at around five cents a dose when you buy them on Amazon. They’re also made without artificial colors and sweeteners and are free from several common allergens, including milk, lactose, soy, gluten, wheat, yeast, and fish, so they’re a good choice for a wide variety of dietary needs.

We also loved that this supplement had many different buying options, including Amazon, iHerb, CVS, Walgreens, and Kroger. This allows you to shop around and find the best deal. Finally, all Nature’s Bounty supplements are third-party tested and produced in a CGMP-compliant facility, ensuring they meet strict quality standards.

One downside of this supplement is the low dose of potassium. However, as previously mentioned, this is due to rules put in place by the FDA and is the case for a lot of over-the-counter potassium supplements. If you want to take a higher potassium dose, you will need to speak with your doctor to get a prescription.

We chose Thorne’s Potassium Citrate supplement as the best for athletes because it is NSF-Certified for Sport, an independent third-party certification program that ensures supplements are free from unsafe levels of contaminants and banned substances and that the product contains exactly what is listed on the label.

One thing to note is that this supplement contains leucine, which typically comes from animal sources, so it may not be appropriate for vegans or vegetarians. We also love that Thorne focuses on sustainability. Nearly all its shipping supplies are made with recycled materials or are recyclable themselves. If sustainability is a factor in your decision-making process, this potassium supplement may be a good choice for you.

We chose NOW Magnesium & Potassium Aspartate as the best potassium supplement for heart health because it contains magnesium, which is essential for normal heart function. It also contains taurine, which may help improve heart health. Low magnesium levels are often seen in people with heart failure, high blood pressure, and stroke.

This supplement is vegan-friendly and free from several key allergens, including dairy, egg, soy, gluten, and nuts, making it suitable for a wide range of dietary needs. It’s also third-party tested and produced in a CGMP-compliant facility, ensuring quality and safety. We also loved that it can be found on several different websites, including Amazon, iHerb, Walmart, Metro Market, Swanson Vitamins, and BariatricPal Store, allowing you to shop around for the best deal. Finally, the bottle is made from 100-percent post-consumer recycled resin, making it a sustainable choice.

There were a few downsides to this supplement. Like many other potassium supplements, it contains a relatively low dose of potassium, which may not be enough for people with low blood potassium levels. People with low blood potassium levels should speak with their doctor about higher-dose potassium supplements. Also, because it contains magnesium, it may cause diarrhea in some people. Finally, some Amazon reviewers reported that the capsules were large and hard to swallow. However, this issue can often be overcome by taking the capsules with plenty of water.

We also liked that all Life Extension supplements are produced in a CGMP-compliant facility and are third-party tested to ensure safety and quality. If you’re looking for a supplement that just contains magnesium, check out our round-up of the best magnesium supplements.

Some of the downsides of this supplement include the low dose of potassium, which is common with over-the-counter potassium supplements. Those needing a higher dose of potassium should speak with their doctor about getting a prescription. Additionally, some reviewers reported an upset stomach. This is likely due to magnesium, which can act as a laxative in some people. However, this is the case with magnesium supplements in general and isn’t specific to this supplement.

We chose Doctor’s Best Glucosamine Chondroitin MSM as the best potassium-containing supplement for joints because, in addition to potassium, they also contain glucosamine, chondroitin, and methylsulfonylmethane (MSM), all of which have been shown to benefit joint health. Glucosamine and chondroitin are natural compounds found in cartilage, the tissue that cushions joints. MSM is a compound found naturally in plant and animal-based foods. It’s known for its anti-inflammatory properties.

In addition to containing ingredients that may help support joint health, we also liked that there were several online retailers selling this supplement, including Doctor’s Best, iHerb, Amazon, Walmart, and Vitacost, enabling you to shop around for the best deal. All Doctor’s Best supplements are third-party tested and produced in a CGMP-compliant facility, ensuring that the product you receive matches what is listed on the label.

A single dose is four capsules, which could be a lot for some people. But they do contain a higher dose of potassium than other supplements we reviewed, so it may be worth the extra pills if you’re looking for a supplement containing more potassium.

This supplement contains shellfish ingredients, so it’s not for vegans or vegetarians. But Doctor’s Best does have a vegan glucosamine supplement with potassium. While it doesn’t contain chondroitin or MSM, it may be a good alternative for people with dietary restrictions.

We also loved that the ingredients for this supplement are third-party tested before being used to make the final product. This ensures they’re free from contaminants like heavy metals. Finally, this supplement is vegan-friendly and cruelty-free, making it a good choice for those who keep ethics in mind when choosing their supplements.

A downside of this supplement is that a dose is 30 drops, which could be tedious to count out. It was also the priciest supplement on our list, so those on a budget may wish to look for a different option.