Electrolyte Supplements: Who Needs Them & How to Choose

Short answer: Most people don’t need electrolyte supplements for everyday hydration; water and normal meals supply plenty of sodium, potassium and magnesium. They’re useful during exercise lasting more than about 1 to 2 hours, heavy sweating in hot weather, and illness with vomiting or diarrhea, when an oral rehydration solution works best. Check the sodium per serving, which ranges from under 100 mg to over 1,000 mg, and be cautious if you have high blood pressure, heart failure or kidney disease.

Electrolyte powders, tablets and drinks have moved from the sports aisle into everyday life, promising better hydration, more energy and fewer headaches. For some people in some situations, they genuinely help. For many others, they add salt, sugar and cost to something plain water and food already do well. This guide explains what electrolytes do, when you need extra, how to compare products, and who should be careful.

To work out how much fluid you need in the first place, try our water intake calculator.

Electrolyte supplements at a glance

Main electrolytes: Sodium, potassium, chloride, magnesium, calcium
Lost most in sweat: Sodium, often around 500–1,500 mg per liter
Useful for: Long or intense exercise, heavy sweating, heat, vomiting or diarrhea
Not needed for: Everyday hydration or short, moderate workouts for most people
For illness: Oral rehydration solution, not a sports drink
Be careful if: High blood pressure, heart failure, kidney disease, some blood pressure medicines

What electrolytes do

Electrolytes are minerals that carry an electrical charge when dissolved in body fluids. They control how much water stays in and around your cells, help nerves send signals, keep your heartbeat steady, and allow muscles to contract. Your kidneys keep blood levels in a tight range by holding on to or flushing out extra.

Sodium and chloride control fluid balance outside cells and are the main minerals lost in sweat.
Potassium controls fluid inside cells and is essential for heart and muscle function. Most Americans eat too little; see our guide to potassium benefits.
Magnesium supports muscle and nerve function and energy production.
Calcium is needed for muscle contraction, though little is lost in sweat.

Who needs electrolyte supplements?

The average American already eats about 3,400 mg of sodium a day, well above the 2,300 mg limit in the Dietary Guidelines, so most people don’t need more salt for everyday life. Extra electrolytes are worth considering if you:

Exercise hard for more than about 60 to 90 minutes, especially in heat, such as long runs, rides, hikes or tournaments.
Sweat heavily, notice white salt marks on your clothes, or work outdoors in hot weather.
Have vomiting or diarrhea, which can cause dangerous fluid and electrolyte losses, especially in children and older adults.
Start a very low-carb or keto diet, which increases sodium loss in the first weeks and can cause headaches and fatigue.
Have certain medical conditions, such as some types of low blood pressure, when a doctor advises extra salt and fluids.

If none of these apply, water is the best everyday drink. Electrolyte drinks used daily without need mainly add sodium and, in many cases, sugar.

Electrolytes for exercise

Moderate evidence The American College of Sports Medicine and other sports nutrition groups recommend that for prolonged exercise, especially in heat, drinks should contain sodium and some carbohydrate. Sodium helps you hold on to fluid, maintains your thirst drive, and lowers the risk of exercise-associated hyponatremia, a dangerous drop in blood sodium.

Practical guidance

Under an hour: water is enough for most people.
One to two hours or longer: a drink with about 300 to 600 mg of sodium per liter, plus 30 to 60 grams of carbohydrate per hour for energy, works well for most athletes.
Heavy or salty sweaters: may benefit from more sodium. Weighing yourself before and after exercise shows how much fluid you lose; each pound lost is about 16 ounces of fluid.
Don’t overdrink: drinking far more than you sweat, especially plain water, can cause hyponatremia during long events. Drink to thirst or to a plan based on your sweat rate.

Muscle cramps are often blamed on low electrolytes, but research suggests most exercise cramps are caused by muscle fatigue rather than salt loss. Electrolytes may help some heavy sweaters, but they’re not a guaranteed fix.

Electrolytes when you’re sick

For vomiting and diarrhea, an oral rehydration solution (ORS) is the right choice. The World Health Organization’s ORS formula combines sodium and glucose in a precise ratio that helps the gut absorb water, and it has saved millions of lives worldwide. Pharmacy ORS products for children and adults are based on similar principles.

Sports drinks aren’t a good substitute when you’re ill: they contain much less sodium and more sugar than an ORS, and the extra sugar can make diarrhea worse. Sip small amounts often if you’re nauseous.

When to get medical help

Call a doctor or seek care for signs of dehydration such as very little or no urine, dizziness, confusion, a fast heartbeat or sunken eyes, or if vomiting or diarrhea lasts more than a day in a baby or young child or more than 2 days in an adult. Babies, older adults and people with chronic illnesses are at higher risk.

Types of electrolyte products

Common electrolyte products
Product	Sodium per serving	Best for
Sports drinks (20 oz)	250–300 mg	Long workouts needing carbs and fluid
Oral rehydration solution (1 liter)	About 1,000–1,700 mg	Vomiting and diarrhea
Electrolyte tablets (1 tablet)	200–400 mg	Adding salt to water during exercise
Electrolyte powders (1 stick)	100–1,000 mg	Varies; check the label
Coconut water (1 cup)	About 250 mg	Light activity; high in potassium

Typical ranges from product labels and published ORS formulas. Always check the label of the product you buy.

How to choose

Match the sodium to the job: 300 to 600 mg per liter for most exercise, more for heavy sweaters, and an ORS for illness. High-sodium “1,000 mg” products are more than most people need day to day.
Check the sugar: carbohydrate is useful during long exercise but unnecessary for sitting at your desk. Sugar-free products are fine for everyday use if you need them.
Look at potassium and magnesium: most products contain modest amounts. If you take medicines that raise potassium, avoid high-potassium products.
Ignore vague claims: “cellular hydration”, “3x faster than water” and added vitamin blends don’t add proven benefits.
Look for testing: athletes in tested sports should choose products with NSF Certified for Sport or Informed Sport seals. Our guide to reading a supplement label explains these.

Food and homemade options

Food is the best everyday source of electrolytes. A salty snack with water covers sodium after a sweaty workout; bananas, potatoes, beans, yogurt and leafy greens provide potassium; and nuts, seeds and whole grains provide magnesium. Milk is an effective recovery drink because it contains water, sodium, potassium, carbohydrate and protein. See our lists of foods high in potassium and magnesium-rich foods.

For a simple homemade sports drink, mix 2 cups of water with 2 cups of fruit juice and ¼ teaspoon of salt. That gives about 290 mg of sodium per 16 ounces. For something with more flavor, our agua de jamaica or calamansi juice with a pinch of salt works too. Don’t use homemade mixes to treat illness in babies or young children; use a pharmacy ORS.

Safety

Who should be careful

High blood pressure: high-sodium products can raise blood pressure. Use them only when you’re losing a lot of sweat, and choose lower-sodium options.
Kidney disease and heart failure: your body may not clear extra sodium, potassium or magnesium properly. Ask your doctor before using any electrolyte product.
Potassium-raising medicines: ACE inhibitors, ARBs, potassium-sparing diuretics and some other drugs raise potassium levels. Avoid high-potassium supplements unless your doctor approves.
Children: use products designed for children and follow the dose on the package, especially during illness.
Overuse: daily high-sodium drinks on top of a typical diet can push sodium intake well above recommended limits.

Electrolyte supplements FAQ

Is it OK to drink electrolytes every day?

For most people, it’s unnecessary. A low-sugar product is unlikely to harm healthy people, but it adds sodium. Save electrolytes for heavy sweating, long exercise or illness.

Are electrolytes better than water?

Not for everyday hydration. Water is ideal for most situations. Electrolytes help when you’ve lost a lot of sweat or fluid through illness.

Can electrolytes help with hangovers?

Alcohol increases fluid loss, so fluids help you feel better, but there’s little evidence that electrolyte products ease hangover symptoms beyond rehydrating you.

Do electrolytes help with muscle cramps?

Sometimes, for heavy sweaters. Most exercise cramps are linked to muscle fatigue, so stretching and pacing yourself often help more.

What are signs of low electrolytes?

Muscle weakness, cramps, fatigue, nausea, headache and confusion can all be signs. Severe symptoms need medical care.

Electrolyte Supplements: Who Needs Them and How to Choose