Best Electrolyte Drinks for Runners: Sodium Compared

Quick answer

The best electrolyte drink for a runner is the one whose sodium dose matches their sweat, not the one with the best marketing.
Popular products range from about 300 mg of sodium per serving (Nuun, many Gatorade products) to 1000 mg (LMNT, Precision Hydration PH 1000).
For runs under an hour, plain water is usually enough.
For long, hot, or salty-sweat sessions, choose a higher-sodium mix, and add carbohydrate to the bottle when the run is also long enough to need fuel.
A homemade mix of water, table salt, sugar, and citrus covers the same job for pennies.

4 key facts

Sodium is the electrolyte that matters most in sweat; the others on the label are mostly along for the ride.
Sodium per serving varies more than threefold across popular products, which is the single most useful comparison number.
Electrolytes and fuel are separate questions: short hot runs may need sodium without carbs, long runs usually need both.
Your sweat rate and saltiness are measurable at home, and they should drive the choice.

Contents

Quick answer
When do runners actually need electrolytes?
How popular electrolyte drinks compare
Electrolytes or fuel? Answer both questions separately
How strong should a sports drink be?
Find your own numbers first
Test your drink in training
Homemade electrolyte drink: the honest recipe
Common electrolyte mistakes
Frequently asked questions
Sources

Electrolyte drinks are having a moment. The shelf that used to hold two flavors of Gatorade now holds a wall of powders, tablets, and ready-to-drink cans, each promising better hydration than the last. Underneath the branding, these products differ on exactly two numbers that matter to a runner: how much sodium per serving, and how much carbohydrate. Everything else is flavor and price.

This guide explains when you actually need electrolytes, compares the sodium and carb content of popular options, and shows how to mix your own. The goal is not to sell you a tub. It is to match what goes in your bottle to what comes out of your skin.

When do runners actually need electrolytes?

Sweat is mostly water plus sodium, with small amounts of potassium, chloride, calcium, and magnesium. Sodium losses vary enormously between athletes, from roughly 200 mg to more than 2026 mg per liter of sweat, which is why one runner finishes a summer long run crusted in white salt lines and another does not. The classic ACSM fluid-replacement guidance recommends including sodium in fluids when sessions are long, sweat rates are high, or losses are visibly salty.

Easy run under 60 minutes, mild weather: plain water is enough. Your normal diet replaces the sodium.
Runs of 60 to 90 minutes, or shorter runs in real heat: electrolytes start earning their place, especially for heavy or salty sweaters.
Long runs, marathons, and back-to-back training days in heat: sodium in the bottle is standard practice, and carbohydrate usually belongs there too.
Warning sign worth respecting: drinking large volumes of plain water during very long events without sodium raises the risk of hyponatremia. More water is not always safer.

How popular electrolyte drinks compare

Typical published values per standard serving are below. Formulations change, so verify the label of anything you buy; the point of the table is the spread, which is enormous.

LMNT

Sodium per serving1000 mg

Carbs per serving0 g

Best fitVery salty sweaters, hot easy runs, off-run replacement

Precision Hydration PH 1000

Sodium per serving500 mg per 500 ml

Carbs per servingAbout 8 g

Best fitHigh sodium with light fuel; strong for hot long runs

Skratch Sport Hydration

Sodium per serving380 mg

Carbs per serving21 g

Best fitBalanced fuel-plus-sodium for long training runs

Gatorade Endurance

Sodium per servingAbout 300 mg per 12 oz

Carbs per servingAbout 22 g

Best fitWhat many big marathons actually serve on course

Nuun Sport

Sodium per serving300 mg

Carbs per servingAbout 1 g

Best fitLight, low-calorie sodium for shorter or easier sessions

Tailwind Endurance Fuel

Sodium per servingAbout 310 mg per 100 cal

Carbs per serving25 g

Best fitAll-in-one bottle fueling for ultras and long efforts

Product	Sodium per serving	Carbs per serving	Best fit
LMNT	1000 mg	0 g	Very salty sweaters, hot easy runs, off-run replacement
Precision Hydration PH 1000	500 mg per 500 ml	About 8 g	High sodium with light fuel; strong for hot long runs
Skratch Sport Hydration	380 mg	21 g	Balanced fuel-plus-sodium for long training runs
Gatorade Endurance	About 300 mg per 12 oz	About 22 g	What many big marathons actually serve on course
Nuun Sport	300 mg	About 1 g	Light, low-calorie sodium for shorter or easier sessions
Tailwind Endurance Fuel	About 310 mg per 100 cal	25 g	All-in-one bottle fueling for ultras and long efforts

Read the table by job, not by brand. A zero-carb, high-sodium mix like LMNT and a carb-rich mix like Tailwind are not competitors; they solve different problems. The mistake is using a 300 mg product when your sweat needs 1000 mg per hour, or sipping a carb-heavy mix on a 40-minute jog that needed neither the carbs nor most of the sodium.

Electrolytes or fuel? Answer both questions separately

Easy hour, cool day

Sodium questionNo, water is fine

Carb questionNo

Easy hour, hot day, salty sweater

Sodium questionYes, 300 to 1000 mg in the bottle

Carb questionNo

90-minute long run

Sodium questionYes, scaled to sweat

Carb questionYes, roughly 30 to 60 g per hour

Marathon or 3-hour+ effort

Sodium questionYes, planned per hour

Carb questionYes, planned per hour; gels can carry it if the drink does not

Run	Sodium question	Carb question
Easy hour, cool day	No, water is fine	No
Easy hour, hot day, salty sweater	Yes, 300 to 1000 mg in the bottle	No
90-minute long run	Yes, scaled to sweat	Yes, roughly 30 to 60 g per hour
Marathon or 3-hour+ effort	Yes, planned per hour	Yes, planned per hour; gels can carry it if the drink does not

This two-question habit dissolves most of the confusion in the category. Sodium replaces what sweat removes; carbohydrate fuels the work. A drink can carry either, both, or neither, and the right combination depends on the session, not on which tub is on your counter. For the full carb math, see our carbs-per-hour guide linked below.

How strong should a sports drink be?

When a bottle carries carbs, its strength decides how fast it leaves your stomach. Carb concentration is grams of carbohydrate per 100 ml, so 60 g in a liter makes a 6% drink. Stronger mixes empty more slowly, and that is when bloating and sloshing start.

4 to 6%

Carbs per 500 ml20 to 30 g

How it sitsEmpties fast, easiest on the stomach

6 to 8%

Carbs per 500 ml30 to 40 g

How it sitsGood balance of fuel and comfort for most runners

8 to 10%

Carbs per 500 ml40 to 50 g

How it sitsSlower, some runners feel bloated

Over 10%

Carbs per 500 ml50 g or more

How it sitsSlow, stomach trouble is likely

Carb concentration	Carbs per 500 ml	How it sits
4 to 6%	20 to 30 g	Empties fast, easiest on the stomach
6 to 8%	30 to 40 g	Good balance of fuel and comfort for most runners
8 to 10%	40 to 50 g	Slower, some runners feel bloated
Over 10%	50 g or more	Slow, stomach trouble is likely

Labels also use the words hypotonic, isotonic, and hypertonic. These compare how concentrated the drink is with your blood, a measure called osmolality.

Hypotonic: weaker than blood and absorbed fastest. Usually low-carb electrolyte mixes, good when you need fluid and sodium but not fuel.
Isotonic: about the same as blood. The classic sports drink, carrying carbs and fluid together on long runs.
Hypertonic: stronger than blood and absorbed slowest. Very strong carb mixes and gels sit here, so take them with plain water.

If a strong bottle leaves you bloated, dilute it and move some of the carbs to gels or chews instead.

Find your own numbers first

Sweat rate is measurable at home with a scale: weigh yourself before and after a timed run without drinking, and the difference is your hourly loss. Do it once on a cool day and once on a warm day and you have a personal range that makes every bottle decision easier. Use the calculator below, and if you often finish runs with salt-crusted skin or clothes, assume the higher end of sodium needs.

Calculate your sweat rate

Use measurements from one representative workout. The formula accounts for drinks and any urine passed during the test.

Pre-workout weight (kg)Post-workout weight (kg)Fluid consumed (L)Urine during test (L)Workout duration (minutes)

A sweat-rate estimate is a planning input, not an instruction to replace every milliliter while moving. Avoid drinking enough to gain weight during exercise, and seek qualified medical advice for a history of hyponatremia, kidney or heart conditions, or heat illness.

Test your drink in training

Once you know your sweat rate, test products the same way. Pick two or three drinks with different sodium levels and use each on the same 90-minute run, on a similar route in similar weather. Afterward, note your energy, stomach comfort, thirst, and urine color. The drink you feel best on is your match. Re-test every 6 to 12 months, or when the season changes.

Taste counts too. Mild flavors like lemon-lime hold up better on long runs, while very sweet or strong flavors can get hard to drink after two or three hours. If artificial sweeteners upset your stomach, check the label before you buy a tub.

Homemade electrolyte drink: the honest recipe

Commercial mixes are convenient, but the chemistry is simple and the ingredients are in your kitchen. Per liter of water: one quarter to one half teaspoon of table salt (roughly 600 to 1200 mg of sodium), 30 to 60 g of sugar or maltodextrin if the run needs fuel, and a squeeze of lemon, lime, or orange for flavor and a little potassium. Mix, chill, done. Start at the low end of salt and adjust by taste and by how your runs feel.

Hot easy run: water, a quarter teaspoon of salt, citrus, no sugar.
Long run bottle: water, a quarter to half teaspoon of salt, 40 to 60 g of sugar, citrus.
Do not exceed roughly a half teaspoon of salt per liter; more tastes awful and most stomachs will tell you.
Homemade mixes suit training best. For races, use whatever concentration you rehearsed, homemade or commercial.

Common electrolyte mistakes

Buying by brand loyalty instead of reading the sodium line.
Treating electrolyte drinks as a daily health habit when your training and diet do not need them.
Using a low-sodium tablet for a three-hour summer run and wondering about the headache.
Chasing hydration with plain water alone in very long events.
Never testing sweat rate, so every bottle is a guess.

Frequently asked questions

What is the best electrolyte drink for runners?

The one whose sodium matches your sweat and whose carbs match the session. Salty sweaters on hot long runs do well with high-sodium mixes like Precision Hydration or LMNT; runners who also need fuel in the bottle are better served by Skratch, Tailwind, or Gatorade Endurance.

Do I need electrolytes for a 30-minute run?

No. Water, or nothing, is fine for short runs in most conditions. Your next meal replaces the small sodium loss.

How much sodium do runners need per hour?

It depends on sweat rate and sweat saltiness, which vary widely between runners. Common practical ranges run from about 300 to 1000 mg per hour in long, hot sessions. A sweat test plus attention to salt marks on your kit narrows your personal number.

Is a homemade electrolyte drink as good as store-bought?

For training, yes. Water, table salt, sugar, and citrus cover the same sodium and carbohydrate jobs as commercial mixes at a fraction of the price. Commercial products win on flavor, convenience, and consistent dosing.

Are zero-sugar electrolyte drinks better?

They are better for sessions that need sodium but not fuel, such as hot easy runs. For long runs and races, carbohydrate in the drink or alongside it is a feature, not a flaw.

Can I mix sports drinks and gels?

Yes, and it is a common setup. Use a mild or low-carb electrolyte drink for fluid and sodium, and let gels carry most of the carbs. This split suits sensitive stomachs, because you can change your carb dose without drinking more.

Sources

1ACSM Position Stand: Exercise and Fluid ReplacementMedicine and Science in Sports and Exercise (Sawka et al., 2007)Fluid, sodium, and hyponatremia guidance for exercise
2Nutrition for Athletics: 2019 IAAF Consensus StatementWorld AthleticsHydration and overdrinking warnings for distance running
3Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and ACSM: Nutrition and Athletic PerformanceMedicine and Science in Sports and Exercise (Thomas et al., 2016)Electrolyte replacement and individual sweat variability

General guidance for healthy adults, not medical advice. Talk to a doctor or registered dietitian if you have a health condition, take medicines or have special dietary needs.

Mavr Sports Nutrition Team. The Mavr sports-nutrition team translates peer-reviewed endurance research (Jeukendrup, Burke, the ISSN) into daily fueling for runners and triathletes.

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Best electrolyte drinks for runners: what actually matters, compared