Walk into any gym, supermarket, or petrol station and you’ll find an entire shelf dedicated to electrolyte drinks. Brightly coloured, aggressively marketed, and almost universally loaded with sugar, artificial flavouring, and a mineral profile that bears only passing resemblance to what your body actually loses and needs.
The electrolyte conversation is one of the most confused in mainstream wellness. People either dismiss it entirely (“just drink water”) or overcorrect into expensive supplement stacks that do very little. The actual science sits somewhere more useful than either extreme — and once you understand it, the practical decisions become surprisingly simple.
What electrolytes actually are
Electrolytes are minerals that carry an electrical charge when dissolved in water. The ones that matter most for hydration are sodium, potassium, magnesium, and calcium. They govern how water moves in and out of cells, how nerve signals fire, how muscles contract and relax, and how your kidneys regulate fluid balance.
Sodium and potassium work together to create the electrochemical gradients that pull water across cell membranes. Without the right balance, water you drink doesn’t reach the cells that need it. This is the same mechanism behind why drinking more water doesn’t always fix dehydration — volume is only one part of the equation.
What you actually lose in sweat
The primary electrolyte in sweat is sodium — by a significant margin. A litre of sweat contains roughly 900mg of sodium, around 200mg of potassium, about 24mg of magnesium, and very small amounts of calcium.
Now look at a standard sports drink. Most contain somewhere between 200-400mg of sodium per bottle, a small amount of potassium, negligible magnesium, and substantial quantities of sugar — often 30-50g per bottle. The ratio of sugar to actual electrolyte content is wildly skewed toward what makes the product palatable and profitable rather than what replaces what you’ve actually lost.
The magnesium problem is particularly worth noting. Magnesium is involved in over 300 enzymatic reactions in the human body, plays a direct role in muscle relaxation and nerve function, and is one of the most commonly deficient minerals in the Western diet. It’s almost entirely absent from commercial sports drinks.
Are your electrolytes actually working for you?
The free Code of Hydration quiz takes 3 minutes and shows you exactly where your hydration system is and isn’t working.
Who actually needs electrolyte supplementation
For a relatively sedentary person eating a varied whole-food diet and not sweating heavily, electrolyte supplementation is probably unnecessary. The picture changes significantly for people who exercise regularly and intensely, especially in warm conditions. It also changes for people who eat a low-carbohydrate or ketogenic diet, or anyone drinking large volumes of plain water.
What actually works
The simplest and cheapest electrolyte intervention available is unrefined sea salt or Himalayan pink salt added to water. A quarter to half a teaspoon per litre covers most of the sodium replacement for a moderate workout. It’s not glamorous. It works.
For potassium, whole foods are genuinely the best source — bananas, avocados, sweet potatoes, leafy greens, white beans. For magnesium, supplementation makes more sense for many people. Magnesium glycinate or magnesium malate are well-absorbed forms. Taking 200-400mg in the evening supports both muscle recovery and sleep quality.
The bottom line: skip the neon sports drinks, add a pinch of good salt to your water, eat your vegetables, and consider a magnesium supplement in the evening. This is especially important if you’re a regular coffee drinker — caffeine actively depletes magnesium with every cup, making the mineral deficit worse than most people realise.
This article is for general informational purposes only and is not medical advice. If you have specific health concerns, please consult a qualified healthcare professional.
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