Best Electrolytes for Runners (2026): Hydration, Cramping & Long Runs

Electrolytes can be useful during some long, hot, or high-sweat runs—but most runners do not need a supplement for every outing. The right choice depends on the run, your sweat losses, what you eat and drink, and whether you also need carbohydrate for energy.

Disclosure: HMTP may earn a commission if you buy through product links in this article, at no additional cost to you. These relationships do not change the product facts or mean every runner needs a supplement.

Best Electrolytes for Runners: A Quick Comparison

These products suit different preferences. Nutrition amounts are per labeled serving and can vary by flavor, product version, or serving size; check the current package before use. The amounts below are not a dosing prescription.

Product figures are based on current manufacturer information and product labels available at the time of review: LMNT, Liquid I.V., Nuun Sport, SaltStick Caps label record, and Skratch Labs. Key Nutrients product details are from its manufacturer page; its publicly accessible text did not provide electrolyte quantities per stick. Formulations may change. Check the package label.

Do You Really Need Electrolytes on Every Run?

No. Electrolyte products are optional tools, not a requirement for being a runner. For many short, moderate runs—particularly in comfortable weather, when you begin normally hydrated and eat regular meals—plain water as desired and ordinary food are enough. You do not need to add a tablet just because you ran a certain distance or passed a particular time mark.

Consider the whole situation before choosing a product:

• Duration and effort: A longer session gives you more time to lose fluid and sodium, and may make carbohydrate fueling relevant too. A brief easy run usually has different needs from a long workout.
• Weather and clothing: Heat, humidity, direct sun, and clothing that traps heat can raise sweat losses. The same route may call for a different plan on a cool morning than on a hot afternoon.
• Your own sweat: Sweat rate and sweat sodium vary widely. Heavy sweating or salt marks on clothing can be useful clues, but they do not give an exact sodium-loss measurement.
• What you have eaten and drunk: Food and drinks before, during, and after a run contribute fluid, sodium, carbohydrate, and other nutrients. A supplement is only one part of that picture.
• Preference and tolerance: Taste, stomach comfort, access to water, and what you can carry matter. Practice with a product in training before relying on it for a race.

For sessions lasting longer than about an hour, sports-medicine guidance commonly describes drinks with roughly 500–700 mg sodium per liter as one possible starting concentration. That is a contextual example, not a universal hourly target: how much you drink and how much sodium you lose are individual. A recreational runner may need less, and a runner with unusually high sweat losses in heat may need an individualized plan. The IOC’s heat-exercise consensus also emphasizes that sweat and sodium losses vary and that strategies should reflect the athlete and conditions. ACSM position stand on exercise and fluid replacement; IOC consensus on sport events in the heat.

One practical way to learn about your fluid losses is to compare body weight before and after a representative workout in similar conditions, accounting for what you drank and any bathroom breaks. Repeat in different weather; one session is not a permanent prescription. Do not aim to finish heavier than you started. If you have a medical condition or take medication that affects fluid or electrolyte balance, ask your clinician before using a sweat-test result to set a plan.

Hydration Is Not the Same as Fueling

Water helps replace fluid. Sodium helps replace some of the sodium lost in sweat and supports fluid balance. Carbohydrate supplies energy during prolonged exercise. These needs can overlap in a sports drink, but they are not interchangeable.

“Bonking” is commonly associated with carbohydrate availability and depleted glycogen during prolonged exercise; an electrolyte mix with no carbohydrate will not provide running fuel. For longer endurance sessions, sports-nutrition guidance often uses a range around 30–60 g carbohydrate per hour as a starting point, adjusted to the runner, duration, and tolerance. Many recreational half-marathon trainees can begin by practicing a small, manageable fueling plan on their longer runs. For background on endurance fueling, see the joint sports nutrition position statement.

A sports drink such as Skratch can contribute both carbohydrate and sodium; a sugar-free mix such as LMNT cannot replace carbohydrate fuel. Liquid I.V. Hydration Multiplier contributes some carbohydrate, but one serving may not provide all the carbohydrate a long session calls for. Check the label and count any drink toward your overall fuel intake.

Hydration is one piece of a complete training approach. Pair it with gradual running progression, appropriate easy days, recovery, and long-run fueling. Explore the HMTP training plans and runner resources.

What Sodium, Potassium, and Magnesium Do

• Sodium is the main electrolyte lost in sweat. It helps regulate fluid outside cells and supports normal nerve and muscle function. Sweat sodium concentration varies substantially between people and conditions.
• Potassium is important for normal cell, nerve, and muscle function, with most of the body’s potassium inside cells. Most runners get potassium from food; routine high-dose potassium supplementation during a run is not necessary for everyone. NIH Office of Dietary Supplements: potassium.
• Magnesium is involved in many normal body processes, including nerve and muscle function. That does not mean runners generally need magnesium in their drink or a magnesium supplement to prevent cramps. Meet ordinary needs through a varied diet unless a healthcare professional identifies a reason to supplement. NIH Office of Dietary Supplements: magnesium.
• Chloride, calcium, and other minerals also have important roles in normal physiology, but that does not make a multi-mineral supplement necessary during every workout.

How Much Sodium Should You Take During a Run?

There is no single sodium dose that fits every runner. Needs depend on sweat rate, sweat sodium concentration, duration, weather, clothing, fluid intake, food, and the runner’s health. A product’s sodium per serving is not the same as your personal sodium loss per hour.

Use a product label to understand what you are choosing, then consider the conditions and your own experience. A 1,000 mg sodium serving can be useful for some people in a specific context, but it is not automatically better than a lower-sodium option. Do not combine several high-sodium products simply because a run is long. Potassium and magnesium also do not need universal hourly targets in a running plan.

For ordinary training, start with normal meals and drink according to thirst. For a long, hot race or a runner with recurrent problems and substantial sweat losses, rehearse a plan in training; a sports dietitian or clinician can help make it individual. Avoid experimenting with salt tablets or concentrated drinks for the first time on race day.

Can You Drink Too Much Water? Exercise-Associated Hyponatremia

Do Electrolytes Prevent Muscle Cramps?

Not reliably. Exercise-associated muscle cramps are multifactorial. Fatigue and exceeding what the muscles are prepared to do appear to matter for many athletes; prior cramping history and individual circumstances also matter. Fluid or sodium loss may contribute in some cases, especially with substantial sweat losses in heat, but cramps do not prove that a runner is sodium deficient. A recent systematic review found prior cramping history to be the most consistently supported risk factor. 2026 systematic review and meta-analysis of cramp risk factors; evidence-based review of exercise-associated muscle cramps.

Electrolytes may be one consideration for a runner with unusually high sweat losses, but they are not a universal cramp cure. Review training load, pacing, heat exposure, and preparation, and seek medical advice for recurrent, severe, or unusual symptoms. Do not take magnesium solely because you cramped.

Common Electrolyte Mistakes

• Taking a supplement on every short run without a specific reason.
• Assuming the highest-sodium product is best for everyone.
• Confusing electrolyte replacement with carbohydrate fueling.
• Forcing water or sports drinks beyond thirst.
• Assuming every cramp means sodium or magnesium deficiency.
• Trying a new product, capsule, or concentration on race day.

Frequently Asked Questions

Do I need electrolytes for a 5K?

Usually not during the race for a healthy runner in ordinary conditions. Start normally hydrated and use water if you want it. Heat, a high sweat rate, or a medical condition can change individual needs.

Do I need electrolytes for a half marathon?

It depends on your finish time, weather, sweat losses, aid-station access, food, and tolerance. A runner may benefit from sodium and fluid during a hot or long race, while another may not need a supplement. Practice your approach on long runs and avoid overdrinking.

Is water enough for a one-hour run?

For many easy or moderate runs of about an hour in comfortable conditions, yes. Some runners may want fluid or sodium in heat or if they sweat heavily. Do not use the clock alone to decide.

Are electrolyte tablets better than sports drinks?

Neither is universally better. Tablets are portable and usually provide little carbohydrate; sports drinks can provide fluid, sodium, and carbohydrate together. Choose based on what the session requires and what you tolerate.

How much sodium do runners lose through sweat?

It varies considerably with sweat rate, sweat sodium concentration, heat acclimation, and conditions. A single population average cannot tell you your own losses. Heavy sweating or salt marks can prompt closer attention, but they are not a precise test.

Should I take magnesium before running?

Most runners do not need magnesium immediately before a run. Magnesium is an essential nutrient, but an extra dose is not a proven routine fix for cramps or performance. If you have a diagnosed deficiency or another reason to supplement, follow individualized medical guidance.

Can I drink too much water during a race?

Yes. Drinking more fluid than your body can excrete can contribute to exercise-associated hyponatremia. Drink according to thirst rather than forcing a predetermined volume, and do not aim to gain weight during a race.

Listen: HMTP on Nutrition and Running

For a related discussion, listen to the HMTP podcast episode on nutrition, recovery, and injury prevention.

Start Your Half Marathon Training Plan

Health note: This article is general education, not individualized medical advice. Runners with kidney disease, heart failure, hypertension, disorders affecting fluid or electrolyte balance, or medications that affect kidney function, blood pressure, or fluid balance should ask a qualified healthcare professional about sodium, potassium, magnesium, and fluid intake. Do not change prescribed medication based on this article.