In this article we break down what electrolytes really are, the five that matter most, what happens when they drift out of range, and why the smartest move isn't taking more. It's knowing your numbers.
What are electrolytes and what do they do?
Electrolytes are minerals that carry an electrical charge when dissolved in your body's fluids. That charge is the point. Almost everything your body does at speed runs on it.
They do four jobs at once:
- Fluid balance: they decide how much water sits inside your cells versus around them.
- Nerve signals: every impulse that fires, from a heartbeat to a thought, moves on a gradient of charged minerals.
- Muscle contraction: the same gradient tells your muscles when to fire and when to relax.
- Acid-base balance: they keep your blood at the narrow pH your enzymes need to work.
When people say they feel "off" after a long run, a hot day, or a bad night, an electrolyte shift is often part of it.
The five key electrolytes: sodium, potassium, magnesium, calcium and chloride
Most of the conversation is about sodium. Sodium matters, but it is one of five.
- Sodium: the headline mineral. Regulates fluid balance and blood pressure, and carries most of the electrical load in your nerves. You lose it fastest through sweat.
- Potassium: sodium's counterweight. It lives mostly inside your cells and governs muscle contraction and a steady heartbeat. Sodium and potassium only work as a ratio, not as solo numbers.
- Magnesium: the quiet one. Involved in more than 300 enzyme reactions, energy production, muscle relaxation and sleep. One of the most commonly under-supplied minerals in a modern diet.
- Calcium: beyond bone, it is the trigger for muscle contraction and blood clotting. Your body guards blood calcium tightly, pulling from bone when intake falls short.
- Chloride: the one nobody names. It partners with sodium to hold fluid balance and is a building block of the acid in your stomach.
The takeaway: "electrolytes" is not one thing you top up. It is a system that has to stay in balance with itself.
Signs of an electrolyte imbalance
An electrolyte imbalance rarely announces itself. It shows up as vague, everyday symptoms that get blamed on other things:
- Cramps, twitches or weakness in your muscles
- Fatigue and brain fog that sleep doesn't fix
- Headaches, dizziness or a racing heartbeat
- Poor recovery after training you used to handle easily
Push it far enough in either direction and it stops being vague. Too little sodium (hyponatremia) can cause confusion and seizures. Too much of some minerals is just as dangerous. The problem is that the mild version and the serious version start the same way, which is exactly why you can't read it off how you feel.
Why taking more electrolytes is the wrong answer
Here is where most electrolyte advice falls apart. It assumes everyone is low and everyone needs the same top-up. Neither is true.
Your needs are not static. They shift with how much you sweat, the heat, your training load, your diet, and how your kidneys are handling the load that day. An amount that is perfect on a rest day can be too little the morning after a two-hour session in the heat, and too much the day you barely move.
Loading up on minerals blindly doesn't remove the guesswork. It just moves it. You are still hoping you picked the right amount, for the right mineral, on the right day. And because the symptoms of too little and too much overlap, you often can't tell whether it worked.
There is a better order of operations: measure first, then act.
How to test your electrolyte levels: blood panel and sweat test
You don't have to guess. Electrolytes are one of the most measurable things in your body.
- A blood panel gives you the full picture: sodium, potassium, magnesium, calcium and chloride, read against reference ranges, so you can see which mineral is actually off instead of guessing.
- A sweat test answers a question a blood test can't: how much sodium you personally lose when you sweat. Sweat sodium varies several-fold between people, which is why one person cramps on the same plan another thrives on.
At anomalie both feed into the same place. Your results land in your HealthTree, so a single number becomes a trend you can watch over a season of training. Our doctors' protocols keep the interpretation honest, and the app turns it into a recommendation built on your data, not a population average.
That is the whole difference. Not "here is a mineral, good luck." It is "here is your level, here is what it means, here is what to do next."
Where Supersalt electrolytes fit
Once you know your numbers, you need something clean to act on. That is why we built Supersalt: an electrolyte mix built on the ratios your body actually runs on, with a complete sodium, potassium, magnesium and calcium profile, mild lemon, no sugar crash, no fillers to explain away.
But Supersalt was never the whole story. It is one input in a system. Test your levels, watch them move in your HealthTree, and adjust what you take based on what you actually lose. The powder is the easy part. Knowing when and how much you need is the part worth getting right.
Bottom line: measure your electrolytes, don't guess
Yes, electrolytes matter. They run your nerves, your muscles and your fluid balance, and getting them wrong shows up as the tiredness, cramps and fog most people just live with.
But the answer to "do I need electrolytes?" is not a louder yes and a bigger scoop. It is a number. Measure sodium, potassium, magnesium, calcium and chloride, learn what your body actually loses when you sweat, and act on that. Everything else is a guess in a nicer package.
References
- Shrimanker, I., Bhattarai, S. (2023). Electrolytes. StatPearls.
- Baker, L. B. (2017). Sweating Rate and Sweat Sodium Concentration in Athletes: A Review of Methodology and Intra/Interindividual Variability. Sports Medicine.
- de Baaij, J. H. F., Hoenderop, J. G. J., Bindels, R. J. M. (2015). Magnesium in Man: Implications for Health and Disease. Physiological Reviews.
- Hew-Butler, T., et al. (2015). Statement of the Third International Exercise-Associated Hyponatremia Consensus Development Conference. Clinical Journal of Sport Medicine.
- O'Donnell, M., Mente, A., Rangarajan, S., et al. (2011). Urinary Sodium and Potassium Excretion, Mortality, and Cardiovascular Events. JAMA.