Do electrolyte powders do anything?
Sweat is mostly sodium, and one stick can carry 1000mg of it. Whether that helps or just gets you to the daily limit faster depends on things you can actually check.
Short answer: yes, if you are actually losing them. Long or hot sessions, heavy sweating, or a low carb diet all genuinely deplete sodium. For a normal hour in an air-conditioned gym, food already covers it, and a single stick can carry 1000mg of sodium, which is a large share of a day's worth.
The category grew fast, the marketing is about hydration, and the actual question is about sodium.
What is in one
Four things do the work: sodium, potassium, magnesium and chloride. The rest of a typical label is flavouring and sweetener.
Sodium is the one that matters most, because it is what you lose most of. Sweat sodium concentration varies a lot between people, roughly 200mg to 2000mg per litre, which is why two people doing the same session can have genuinely different needs.
The number to look at
A popular stick contains around 1000mg of sodium. The NHS recommends no more than 2300mg a day for adults, and most people in the UK already exceed that from food before adding anything.
SODIUM, A TYPICAL DAY
That is the honest framing. If you are already at the limit from food, a stick is not topping you up, it is putting you well over. If you have sweated heavily for two hours, the same stick is replacing something you genuinely lost.
Who actually benefits
Long or hot sessions. Past about an hour of real sweating, or anything in heat, sodium losses start to matter and plain water alone can leave you worse off.
Heavy or salty sweaters. If your kit dries with white marks on it, that is salt, and you are at the high end of the range.
Low carb or fasting. Cutting carbs drops insulin, which makes the kidneys excrete more sodium. This is most of what people call keto flu, and it is the one case where the powder solves something quickly.
Illness. Fluid loss from either end depletes electrolytes fast.
Who does not
Someone doing an hour of weights indoors, drinking water, eating normally. There is nothing there to replace. Feeling better after one is worth taking seriously, but it is worth checking whether the thing you needed was water.
Hydration is not the same as electrolytes
The two get sold together and they are separate problems. You can be short of water, short of sodium, or both, and drinking more plain water when you are short of sodium can make things worse rather than better.
What to do
- Read the sodium number first. It is the whole product. Everything else is present in small amounts.
- Add it to your day, not to your workout. A stick plus a normal diet can push you well past the limit without you noticing.
- A pinch of salt in water is the same active ingredient. Roughly 1g of table salt is about 400mg of sodium, for pennies.
- Use it when you have earned it. Long, hot, sweaty, low carb or ill. Not by default.
Related reading: can you take too many supplements and is 50mg of zinc too much.
Verdict adds up what you are actually taking. Photograph the supplement facts panel and it reads every dose, compares each against the amounts used in published research, and totals them across your whole stack. It reports the arithmetic. It does not tell you what to take.
