Do you need electrolytes?
Most people don’t need electrolyte drinks for everyday life or workouts under about an hour. Food covers what you lose. Electrolytes start to matter in long sessions, hot conditions, and for heavy or salty sweaters, where sodium losses add up. Your sweat rate and session length decide it, not the marketing on the tub.
The short version
Ask three questions.
- How long is the session? Under an hour, you’re usually fine with water. Past an hour or two, electrolytes and carbohydrate start to pay off [3].
- How hot is it? Heat raises sweat rate, and sweat rate drives sodium loss.
- How much, and how salty, do you sweat? Sweat sodium ranges from 230 to 1,610 mg/L between people [1]. A heavy, salty sweater and a light sweater can lose very different amounts in the same workout.
If all three answers are “short,” “mild” and “not much,” water is enough. If any of them is “long,” “hot” or “a lot,” keep reading.
Situations where you probably don’t need electrolytes
Short workouts: A 30- or 45-minute run, a lifting session, a spin class. You lose some sodium, and your next meal replaces it. The ACSM position stand on fluid replacement says normal meals and snacks with enough sodium, plus water, restore hydration when there’s time [6].
At your desk: Drinking an electrolyte mix through a sedentary day adds sodium you haven’t sweated out. If you like the taste, fine, but it isn’t doing a job water can’t.
As a daily habit “for hydration.” Water hydrates you. Electrolytes help replace what sweat takes. Without much sweat, there’s little to replace.
Situations where electrolytes help
Long endurance sessions: Marathons, long rides, triathlons, all-day hikes. Sodium loss accumulates hour after hour. In Barnes 2019, endurance athletes lost a mean of 1,189 mg/h of sodium per hour, with wide variation [2]. Over several hours, that’s a lot to leave unreplaced.
Hot, humid conditions: You sweat more, so you lose more sodium per hour, even in sessions that would be easy in cool weather.
Heavy and salty sweaters: If your sweat rate is high or you know your sweat is salty, your sodium loss per hour sits well above a light sweater’s. Our electrolytes for heavy sweaters page ranks drinks for this.
Team sports with long practices or tournaments: Barnes 2019 found American football players had some of the highest sweat rates and sodium losses of any sport tested [2]. Long summer practices and multi-game days add up.
Two sessions close together: When you need to recover fast, the ACSM says the speed of rehydration needed decides whether an aggressive replacement plan makes sense [6]. Sodium with your fluids helps you hold on to them [6].
When to drink electrolytes
Before: If you’re heading into a long, hot session, the ACSM suggests drinking several hours ahead so your body has time to absorb it, and notes that sodium-containing drinks or salty snacks help stimulate thirst and retain fluid [6]. You don’t need to load up. Start normally hydrated.
During: This is where electrolytes matter most in long sessions. Sip to thirst from a drink that contains sodium. The hydration calculator gives a fluid and sodium range per hour for your session.
After: For most sessions, a normal meal plus water is enough [6]. An electrolyte drink is a shortcut if you can’t eat soon or train again within hours.
How much is too much?
There are two ways to overdo it.
Too much fluid: This is the one that’s dangerous. Exercise-associated hyponatremia, a drop in blood sodium, is mainly caused by drinking more than you sweat, and the 2015 consensus statement recommends drinking to thirst [5]. Electrolyte drinks contain much less sodium than blood, so drinking extra of them does not make overdrinking safe [5]. If you finish a session heavier than you started, you drank too much.
Too much sodium for your health: A single high-sodium stick can carry a large share of a day’s sodium. That’s reasonable when you’re sweating it out. Taken daily while sedentary, it just adds to your intake. If you have high blood pressure, heart or kidney disease, or take medication that affects sodium or potassium, talk to your doctor before using electrolyte products.
How to figure out your own needs
- Measure your sweat rate with the sweat rate calculator. It takes one weighed session.
- Enter your sweat rate and session details in the hydration calculator to get fluid, sodium and carbohydrate ranges.
- Pick a drink that fits. Browse the drinks database or start with our rankings for runners or the best electrolyte powders.
- Test it in training, not on race day.
Our guide on how much sodium per hour explains the reasoning behind the sodium numbers.
Watch out for marketing
Electrolyte products are sold with promises about everything from focus to faster hydration. Treat those claims as the brand’s words. Our database reports what’s on the label (sodium, potassium, magnesium, sugar, sweeteners and price) and leaves the promises out. If a brand says its drink hydrates faster than water, ask to see the study.
FAQ
Do I need electrolytes if I drink a lot of water?
Drinking a lot of water doesn’t create a need for electrolytes, but drinking far more than you sweat during exercise can dilute your blood sodium. That’s why the recommendation is to drink to thirst, not to a target [5]. Adding electrolytes doesn’t make overdrinking safe. Drink less if you’re gaining weight during exercise.
When should you drink electrolytes?
During long, hot or very sweaty sessions is when they matter most. Before a long session in the heat, sodium-containing drinks or salty snacks can help you retain fluid [6]. After most workouts, a normal meal with water does the job [6]. For short workouts, water is usually enough.
Should I drink electrolytes every day?
Only if you’re sweating a lot every day, such as training long in the heat or working outdoors in summer. Otherwise, food covers what you need, and daily electrolyte mixes add sodium you haven’t lost. If you have blood pressure, heart or kidney concerns, ask your doctor before making them a habit.
Are electrolytes good for you?
Electrolytes themselves are essential. Electrolyte drinks are useful when you’re losing a lot through sweat, mainly in long or hot sessions [6]. Outside of that, they’re a flavored drink with added sodium, and sometimes sugar. Whether they’re good for you depends on how much you sweat.
Can you have too many electrolytes?
Yes. High-sodium products taken daily without sweat loss add to your total sodium intake, which matters for people with blood pressure, heart or kidney conditions. During exercise, the bigger danger is too much fluid, which can cause exercise-associated hyponatremia whether or not the drink has electrolytes [5].