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The Healf Source
Why Potassium Is Actually The Most Important Electrolyte Ingredient
Meet the main intracellular electrolyte that works inside our cells to maintain fluid balance and support normal cellular function.
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Written by: Rachel Hosie
Written on: April 6, 2026
When you think of “electrolytes”, your brain probably immediately jumps to sodium. It makes sense. Most electrolyte sticks and mixes can taste quite salty, and we typically take them to replenish our bodies after a sweaty workout. But sodium is actually just one piece of a much larger electrolyte puzzle that keeps your body healthy and humming.
Potassium, which is a key electrolyte we need to help our bodies regulate the electrical signals that drive muscle contractions and even your heartbeat, is actually equally important in your overall mineral balance. In fact, it helps balance out the negative effects of consuming too much sodium (a common feature in Western diets) while also keeping your blood pressure levels and cardiovascular health in check.
We asked a nutritionist and dietitian to break down potassium’s essential role in our bodies and as an important element in our electrolyte supplementation routine. Here's what they said, and why it's so important.
What are electrolytes?
Electrolytes are minerals that carry an electric charge, including sodium, potassium, magnesium and calcium. They’re involved in a wide range of essential processes in the body, including regulating fluid balance, supporting nerve signalling, and enabling muscle contractions.
While most healthy people who eat a varied, balanced diet meet their electrolyte needs through their everyday food and drink, there are situations where supplemented intake becomes more important. “Prolonged or high-intensity exercise, particularly in warm environments, can lead to increased [electrolyte] losses through sweat,” says Rhiannon Lambert, registered nutritionist and author of The Fibre Formula. “Similarly, illness involving vomiting or diarrhoea can disrupt fluid and electrolyte balance. In these cases, electrolyte-containing fluids may help with rehydration.”
What does potassium do in the body?
Potassium is the main intracellular electrolyte, meaning it works inside our cells to maintain fluid balance and support normal cellular function.
“It’s essential for nerve signalling and muscle contraction, including the heartbeat, and helps counterbalance sodium’s effects on blood pressure by promoting sodium excretion and supporting healthy blood vessel function,” says Nichola Ludlam-Raine, dietitian and author of How Not to Eat Ultra-Processed.
While sodium operates largely outside our cells, potassium works within them, and this delicate, coordinated effort is critical for overall physiological function.
Why is it important for overall health?
Getting enough potassium is absolutely essential for proper muscle and nerve function, as well as cardiovascular health.
Diets that are higher in potassium and lower in sodium have been linked with improved blood pressure levels, but in practice the issue is often not the lack of sodium, but an imbalance between the two, Lambert says.
In western cultures, which tend to feature high-salt meals, people tend to consume more sodium than they need, and actually don’t get enough potassium, meaning their body’s balance is off. In these circumstances, upping your potassium intake could help reduce blood pressure and risk of cardiovascular disease, research suggests. If you have a kidney condition or are taking certain medications, check with a healthcare professional before increasing your potassium intake.
Why magnesium is important to pair with potassium
Magnesium, another key electrolyte, works closely with potassium in several physiological processes, particularly muscle function and nerve signalling. It also helps regulate potassium balance within cells, contributes to energy production and helps regulate muscle relaxation, which complements potassium’s role in muscle contraction.
“Low magnesium levels can impair potassium uptake, so having both in balance is important and may help reduce the risk of muscle cramps,” Ludlam-Raine says.
However, while both magnesium and potassium are important, they don’t need to be “paired” through supplements in most cases, Lambert says: “A balanced diet that includes a variety of whole foods will typically provide adequate amounts of both.”
What are the best ways to get potassium and what should you look for in an electrolyte mix?
The best sources of potassium are whole foods, such as potatoes, bananas, oranges, beans, lentils, leafy greens (like spinach), tomatoes, yoghurt, nuts and fish. “For most people, a food-first approach is more than enough,” says Ludlam-Raine.
However, if you’re looking for an electrolyte product to have on hand for when you might need a boost, Ludlam-Raine recommends choosing one that provides potassium and magnesium alongside sodium and minimal added sugars. That is, unless you’re taking electrolytes during prolonged exercise, when added carbohydrates can support performance and might be beneficial.
“It’s important to recognise that many electrolyte drinks are formulated with athletic performance in mind, rather than everyday hydration needs,” says Lambert. For the average person, look for electrolyte supplements with appropriate, not excessive amounts of each ingredient, as taking too much can lead to an imbalance in the body.
Whether it’s through whole foods or with a little added support from electrolyte products, keeping your body’s minerals in balance is a key part of your overall wellbeing.
This article is for informational purposes only, even if and regardless of whether it features the advice of physicians and medical practitioners. This article is not, nor is it intended to be, a substitute for professional medical advice, diagnosis, or treatment and should never be relied upon for specific medical advice. The views expressed in this article are the views of the expert and do not necessarily represent the views of Healf
Rachel Hosie is a British lifestyle journalist based in the south of France. She spent a decade working as a lifestyle and health reporter for The Telegraph, The Independent and Business Insider, where she was a Health Correspondent.
