Short answer: no, you almost certainly don't need a daily electrolyte powder. If you eat a normal mixed diet, your food already delivers the sodium, potassium and magnesium you lose in a day, and your kidneys are very good at topping up or dumping the rest. The honest exception is sustained heavy sweating, prolonged exercise, or illness with vomiting and diarrhoea. In tropical Singapore that exception comes up more than it does in London, which is exactly why the marketing works so well here. So the real answer is "sometimes, not daily", and the cheap version often beats the premium one.
The "electrolytes are a hydration hack" wave has been very good at selling sachets to people sitting in air-conditioning. Let's separate the genuine use cases from the upsell.
What electrolytes actually do, minus the hype
Electrolytes are minerals that carry an electrical charge in your body fluids: mainly sodium, potassium, chloride, calcium and magnesium. They keep your nerves firing, your muscles contracting and your fluid balance stable. You do need them. The question is never "are electrolytes important", it's "are you actually short of them", and for most people most days the answer is no.
Here is the part the powders skip over. Your kidneys regulate electrolyte levels around the clock, processing what you take in and filtering the excess into your urine. As the American Heart Association puts it, if you're not eating excess sodium, your body does a pretty good job of keeping electrolytes in balance. Nutrition scientist Dr Sara Rosenkranz, quoted in the same piece, is blunt about it: for most people, we get adequate amounts in the foods and beverages we already eat. A normal day's meals, bread, eggs, a banana, some soup, a stir-fry, delivers far more sodium and potassium than a single electrolyte sachet does.
When supplementation genuinely earns its keep
There are three situations where reaching for electrolytes is sound, not marketing.
The first is prolonged, hard exercise. The American College of Sports Medicine's position stand on exercise and fluid replacement notes that beverages containing electrolytes and carbohydrates can provide benefits over water alone under certain circumstances, and the older ACSM guidance puts the practical threshold around the one-hour mark of continuous effort. Below that, the evidence for a sports drink beating plain water is thin. Dr Rosenkranz, again in the AHA piece, says exercise under 75 minutes at low intensity needs only water, with no need for electrolyte supplementation in those cases.
The second is heavy, sustained sweating, the outdoor-worker-in-the-heat scenario. If you're losing a lot of fluid and salt through sweat over hours, replacing some sodium helps you hold onto the water you drink rather than peeing it straight back out.
The third is illness. When vomiting or diarrhoea strips fluid and salts fast, oral rehydration is genuinely useful. The NHS recommends pharmacist-supplied oral rehydration solutions specifically for that, to replace the sugar, salts and minerals your body has lost, while pointing out that for everyday prevention plain water or sugar-free squash is the right call. Note the split: water for ordinary days, a proper rehydration solution for actual illness.
The Singapore twist: heat makes the exception more common
This is where the honest answer gets more interesting locally. Singapore's heat and humidity mean a hard outdoor session, a long run, a football match, a HYROX-style workout, can push you past the heavy-sweat threshold far more easily than the same session in a cool climate. So the "sometimes" case is genuinely more common here than the global advice implies.
That doesn't make a daily powder sensible. It means that on the days you do a long, sweaty session, replacing some sodium is reasonable, and your body adapts to the heat over a couple of weeks anyway (we get into how that works in heat adaptation for runners in Singapore). For a regular gym session in air-conditioning, or a 30-minute walk, water and your next meal cover it. The decision is per-session, not a standing subscription.
And before you panic-drink: more is not safer. The flip side of dehydration is overhydration, and it's a real medical problem in endurance sport.
The thing nobody markets: you can drink too much
The 2017 update on exercise-associated hyponatremia, published in Frontiers in Medicine, is clear that the main cause is overconsumption of hypotonic fluids, drinking more than you sweat out, which dilutes your blood sodium. The uncomfortable detail for the sports-drink industry: sodium-containing sports drinks, because they're hypotonic, will not prevent this if you overdrink. The consensus recommendation is to drink to thirst rather than forcing fluids on a schedule. Thirst is a better guide than a hydration app for the overwhelming majority of people. This is general information, not medical advice. See a clinician before changing how you manage hydration if you have a heart, kidney or blood-pressure condition, are pregnant, or have ever had a hyponatremia episode.
A pinch of salt versus a premium powder
If you've decided a session warrants electrolyte replacement, you don't need to spend much. The active ingredient is mostly sodium, which is to say, salt. A small amount of salt added to your water plus a normal meal afterwards covers what most people lose in a sweaty hour. Premium electrolyte powders aren't harmful, they're just often a marked-up version of something cheap, sometimes with added sugar you didn't ask for.
That sugar matters more than the price. Many popular isotonic drinks carry a meaningful sugar load. After Singapore's reformulation push, a mainstream isotonic drink like 100PLUS sits at around 6g of sugar or less per 100ml under the Healthier Choice scheme, which still works out to roughly 25 to 30g across a 500ml bottle. For context, HealthHub puts the daily added-sugar ceiling at about 10 teaspoons (50g), with a further benefit from getting down to 5 teaspoons (25g). One bottle of full-sugar isotonic can be your entire lower target for the day, before you've eaten anything. The AHA flags the same trap with sports drinks: one example carried 21g of sugar per serving, more than the recommended daily limit allows.
So the genuinely smart move on a heavy-sweat day is often a zero or low-sugar electrolyte option, or just a pinch of salt in your water, rather than a sugary bottle drunk as a "healthy" reflex.
The risks, stated plainly
Electrolyte supplements are not free of downsides. Taking in more than you need, day after day, isn't automatically flushed away without consequence. The AHA notes that excess electrolytes can lead to heart rhythm issues, fatigue and nausea. People with kidney disease, high blood pressure, or heart conditions, and pregnant women, should be especially careful, because the assumption that the kidneys will simply dump the surplus doesn't hold when the kidneys aren't working at full capacity. If that's you, talk to your clinician before making electrolyte drinks a habit, not after.
For everyone else, the message is calmer than the marketing: you are not chronically depleted, you are not one sachet away from optimal, and a balanced diet plus water is doing more than any powder.
Where this leaves you
Electrolyte drinks are a tool, not a daily supplement. Skip the standing habit. Keep water as your default, eat normally, and reach for electrolytes on the specific days that warrant it: a long sweaty session, an outdoor stretch in the heat, or illness with fluid loss. On those days, a low-sugar option or a pinch of salt usually beats a premium powder and almost always beats a sugary bottle.
If you're building a habit, hydration is one of the few that genuinely pays back. We've covered the bigger picture in how much water you actually need, and the same evidence-first lens applies to the rest of the cabinet, the supplements actually worth taking and what's actually in your pre-workout. The pattern repeats: a few things earn their place, most don't, and the label is rarely on your side.
Do I need electrolytes for a normal gym session?
Usually no if the session is under an hour and you eat regular meals. Long, sweaty outdoor work is the clearer case for added sodium.
Water or sports drink?
Water wins for short sessions. Add electrolytes when sweat loss, duration or heat makes plain water insufficient.
Can I overdo electrolytes?
Yes, especially if you stack flavoured drinks, tablets and salty food without heavy sweating. Match intake to actual loss.
Do electrolytes prevent cramps?
Evidence is mixed. Cramps involve fatigue and neuromuscular factors, not sodium alone. Electrolytes help some heavy sweaters, not everyone.
Are coconut water and electrolyte tabs the same?
No. Coconut water is lower sodium than most sports formulations. Read labels for sodium and potassium per serve.
FAQ
Do I need electrolytes for a normal gym session?
Usually no if the session is under an hour and you eat regular meals. Long, sweaty outdoor work is the clearer case for added sodium.
Water or sports drink?
Water wins for short sessions. Add electrolytes when sweat loss, duration or heat makes plain water insufficient.
Can I overdo electrolytes?
Yes, especially if you stack flavoured drinks, tablets and salty food without heavy sweating. Match intake to actual loss.
Do electrolytes prevent cramps?
Evidence is mixed. Cramps involve fatigue and neuromuscular factors, not sodium alone. Electrolytes help some heavy sweaters, not everyone.
Are coconut water and electrolyte tabs the same?
No. Coconut water is lower sodium than most sports formulations. Read labels for sodium and potassium per serve.
Sources
- American Heart Association: Electrolytes can give the body a charge, but try not to overdo it (2024)
- American College of Sports Medicine position stand: Exercise and Fluid Replacement, Sawka et al., Med Sci Sports Exerc 2007 (PubMed)
- Exercise-Associated Hyponatremia: 2017 Update, Frontiers in Medicine
- NHS: Dehydration
- HealthHub Singapore: Reduce your salt and sugar intake
- 100PLUS reformulation and Healthier Choice scheme (Wikipedia, citing manufacturer figures)
Spot an error or have a product we should test? We read every note.
Get in touch
