Do You Need Electrolytes? An Honest Answer

How did a stick of salt become a daily wellness habit?

Electrolyte packets used to live in a marathoner’s gear bag and a parent’s medicine cabinet. Now they’re on the desk next to the laptop, stirred into the morning water bottle, sold with the same language as a vitamin.

Short answer: For most people on most days, no. Americans already average more than 3,300 mg of sodium a day, well over the 2,300 mg limit, and the American College of Sports Medicine’s position is that sweat losses vary so much between people that replacement should be individual. Electrolytes earn their place during long or hot exercise, for heavy sweaters, and during diarrhea or vomiting, where the WHO’s oral rehydration formula is classed as a medicine for good reason.

You’re probably not short on sodium

Start with what’s already on your plate. The CDC puts average American sodium intake at more than 3,300 mg a day, against a Dietary Guidelines limit of under 2,300 mg for teens and adults. The American Heart Association goes further, with an “optimal goal” of 1,500 mg for most adults.

So the typical reader of a hydration ad isn’t running a sodium deficit. They’re running a surplus, and a packet adds to it.

There’s an honest exception written into that same advice. The AHA says the 1,500 mg goal may not apply to people who lose a lot of sodium in sweat, like competitive athletes and workers under heavy heat stress, firefighters and foundry workers among them. The current Dietary Guidelines say something similar: highly active people may benefit from extra sodium to offset sweat losses. Everyone else gets pointed at water.

What sweat actually takes out

This one is a little tricky, because the range is enormous.

A 2017 review in Sports Medicine put whole-body sweat sodium at roughly 10 to 70 millimoles per liter. That works out to somewhere between about 230 and 1,610 mg of sodium for every liter you sweat. Sweat rates typically run half a liter to two liters an hour, and over three liters an hour is rare. Worth knowing: the author works for the Gatorade Sports Science Institute, which funded the supplement it appeared in. The numbers are widely cited anyway.

Two people on the same run can lose seven times different amounts of salt. That’s the whole reason the ACSM’s 2007 position stand doesn’t hand out a universal dose. Its goal is preventing more than about 2% body-weight loss from fluid deficit, and it recommends weighing yourself before and after exercise to work out your own sweat rate. It says drinks with electrolytes and carbohydrate can beat water alone “under certain circumstances”, which is a long way from every day.

You can feel this in your own body. If your workout shirt dries with a white crust on it, you’re a salty sweater. If it doesn’t, you probably aren’t.

The bigger risk in endurance sport is too much water

Here’s where it gets interesting. The danger on record at marathons isn’t too little salt. It’s too much plain water.

Exercise-associated hyponatremia, a dangerous drop in blood sodium, is caused mainly by drinking more hypotonic fluid than you lose, according to the 2015 international consensus. The 2017 update adds the practical part: drinking according to thirst prevents it in temperate events under 17 hours. It calls the preventive role of sodium supplements controversial, and notes that sodium intake was unrelated to hyponatremia in a 161 km ultramarathon.

So even for athletes, the first rule is drink to thirst. Electrolytes come second.

Quick facts	Electrolyte drinks
Average US sodium intake	Over 3,300 mg a day
Daily limit	Under 2,300 mg; AHA optimal 1,500 mg
Sweat sodium	About 230 to 1,610 mg per liter of sweat
When they help	Long or hot exercise, heavy sweating, diarrhea or vomiting
When they don’t	Sitting at a desk, most workouts under an hour, hangovers

When electrolytes really are the right tool

Illness is the clearest case, and the formula for it is old, cheap and well-tested. The WHO and UNICEF’s low-osmolarity oral rehydration solution dissolves 2.6 g of sodium chloride, 13.5 g of glucose, 1.5 g of potassium chloride and 2.9 g of trisodium citrate in a liter of water. Against the older formula, it cut the need for unscheduled IV treatment by 33%, stool output by about 20% and vomiting by about 30%. WHO lists it as a medicine for dehydration from diarrhea, in children and adults.

That’s the template the drugstore products are built on, and it’s the moment a packet is worth more than water.

Long sessions in heat are the second case, especially for the salty sweaters described above. A few medical conditions are the third: the Cleveland Clinic notes that for one form of postural orthostatic tachycardia syndrome, a provider may suggest considerably more salt and fluid than usual. That’s a conversation with a doctor, not a reason to start dosing yourself.

What doesn’t hold up

The hangover claim, for one. In a study of 214 people, drinking didn’t cause significant dehydration, and a vitamin and mineral supplement didn’t improve hangover symptoms.

Everyday hydration is the other. In a 72-person trial measuring how well drinks keep fluid in the body at rest, oral rehydration solution and milk outperformed water, but a typical sports drink was no different from water at all. That study was funded by the European Hydration Institute. And we looked for any research showing electrolyte drinks help an ordinary desk worker and didn’t find one.

Who this is actually for

If you’re healthy, eating normally and exercising for under an hour, water is enough, and the money is better spent elsewhere. If you train long, sweat heavily or work in heat, electrolytes are a reasonable tool, and the amount of sodium in the mix matters more than the branding. We compare the labels in how much sodium is in your electrolyte mix.

If you’re sick with diarrhea or vomiting, an oral rehydration formula is exactly the right thing, and the products closest to the WHO recipe are the ones to reach for. And if you have high blood pressure or kidney disease, check with your doctor before adding a daily high-sodium packet, because a single stick of some mixes is close to half the daily limit.

If you’ve decided you’ll use them, our vetted electrolyte powders are judged on what’s in the stick, including the sweeteners, and coconut water is worth knowing about as the cheaper, more natural-sounding alternative it isn’t quite.

Frequently asked questions

Do I need electrolytes every day?

Most people don’t. Average American sodium intake is already over 3,300 mg a day, above the 2,300 mg limit, so a daily packet usually adds salt you aren’t missing. Daily use makes more sense for people who train long or hard, sweat heavily, or work in heat.

Are electrolyte drinks better than water?

At rest, a typical sports drink kept fluid in the body no better than water in a 72-person trial, though oral rehydration solution and milk did. During long exercise in heat or during illness with diarrhea or vomiting, a drink with sodium and glucose does better than water alone.

When should you drink electrolytes?

During or after exercise lasting longer than about an hour, especially in heat, if you sweat heavily, and during diarrhea or vomiting. For illness, a formula close to the WHO oral rehydration solution is the one to use.

Can you have too many electrolytes?

Yes. Some mixes carry 1,000 mg of sodium per serving, close to half the daily limit, which matters for anyone with high blood pressure or kidney disease. Large amounts of potassium can also be dangerous for people on certain blood pressure medicines or with reduced kidney function.

Do electrolytes help a hangover?

The evidence says no. In a study of 214 people, alcohol didn’t cause significant dehydration, and a vitamin and mineral supplement didn’t improve hangover symptoms. Water, food and sleep do more.