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Electrolytes for runners: The definitive guide

For most areas around the country, spring is in full swing. With spring, comes warmer, windier, and longer training runs, making proper hydration critical to both performance and safety. With the uptick in temperatures, hydration can no longer be at the bottom of your priority list.

Instead of writing yet another useless “news flash” article about how you need to drink more in the summer, I’m going delve into some of the specifics of summer hydration – how electrolytes and hydration go hand-in-hand.

Most running articles discuss hydration and mention that electrolytes are necessary; however, they fail to explain what electrolytes are and why keeping them balanced is crucial to a runner’s health and success. In this article I will explain what electrolytes are, why you need to keep your electrolytes balanced, and some good supplement options that are currently on the market.

What are electrolytes?

Electrolytes are similar to laundry soap in your washing machine; although soap doesn’t make your washer run, it is necessary to get your clothes clean. Like laundry soap, balanced electrolytes are necessary for your digestive, cardiac, muscular and nervous systems to function well.

Electrolytes are sodium (Na+), potassium (K+), calcium (Ca 2+), magnesium, (Mg 2+), chloride (Cl-), phosphate (PO4 2-), bicarbonate (HCO3-), and sulfate (SO4 2-). Sodium, potassium, magnesium and calcium are the four major electrolytes that maintain the body’s fluid balance. As a side note, the + and – symbols mean these minerals are ionic. Their ionic nature gives the electrolytes the ability to carry electrical energy to keep the body’s systems functioning.

Why is electrolyte balance important for runners?

For a runner, keeping your electrolytes balanced is key for successful training and optimum performance. If your electrolytes are imbalanced, you could potentially compromise the success of your next run because of muscle fatigue or cramping. Along with the more frequent muscle cramps in the legs, stomach cramps or side stitches can also be the result of an electrolyte imbalance.

Other electrolyte imbalance symptoms are: muscle spasms, dizziness, fatigue, nausea, constipation, dark urine, decreased urine output, dry mouth and foul breath, dry skin, muscle weakness or stiff and achy joints.

Bathroom frequency and urine color are often the easiest and simplest way to assess your hydration and electrolyte levels. Although bladder size is a consideration, an average, healthy adult, should urinate 5-8 times a day and the color should be a light straw yellow. This is especially important to note after hard workouts or long runs. You shouldn’t be going 5-6 hours between bathroom stops if you’re well hydrated.

Electrolyte balance and cramping

While running you lose electrolytes through your sweat, mainly sodium and potassium. Potassium permits the movement of fluids and nutrients across your cells’ membranes, thus allowing them to carry on their metabolic activities such as contacting muscles. Without sufficient potassium, your muscles cells can’t generate the necessary nerve impulses that control muscle contraction.

Cramping is the body’s way of letting you know the electrolyte tank is empty and it cannot continue; it’s like a car running out of gas. Even you’ve never experienced cramping, electrolytes need to be replenished after sessions longer than a hour to facilitate optimal recovery.

A note on sodium

Just because sodium is an electrolyte, don’t assume your daily sodium consumption will replenish your electrolyte loss from your run.

First, sodium causes water retention. Consuming sodium alone and not in combination with other electrolytes may cause severe swelling of the hands, feet and ankles.

Second, the body monitors electrolyte losses during the run through hormones. After a run, if sodium is consumed in high amounts without other electrolytes to balance, it neutralizes the hormonal system and disrupts the bodies regulation processes. Sodium should be consumed in combination with other electrolytes to assist proper electrolyte balance.

Electrolyte Options

Now that we understand the function and importance of replenishing your electrolytes, we can discuss the best possible options to replenish quickly and efficiently.

Of course, you can always opt for electrolyte drinks like Gatorade and Powerade, but those often contain high amounts of simple sugar. When you’re replenishing electrolytes throughout the day, you don’t want to be consuming high amounts of simple and artificial sugars. So, here are a few different, high quality electrolyte supplements on the market you can add directly to water or your favorite beverage (Note: These are affiliate links. I have searched the web for the best selection and prices for you. By purchasing from them, you help support our efforts):

Hammer Fizz: Calories 10 (per serving)
calcium 100mg, magnesium 50mg, sodium 200mg, postassium 100mg

Nuun: Calories 3
calcium 13mg, magnesium 23mg, sodium 360mg, potassium 100mg

Nathan Catalyst: calories 0
calcium 26mg, sodium 135mg, potassium 60mg

Hammer Endurolytes (1 capsule)
calcium 50mg, magnesium 25mg, sodium 40mg, potassium 25mg

SaltStick Electrolyte Cap
calcium 22mg, magnesium 11mg, sodium 215mg, potassium 63mg

Individual sweat rates

When it comes to losing and replenishing electrolytes every runner is different. Some runners are “salty sweaters” and some people sweat very little. For example, I personally am a very salty sweater and I have found that the Nuun tablets work best for me. Someone who doesn’t sweat as much, may prefer using the Endurolytes because they have slightly less electrolytes. Luckily, we’ve created a very handy sweat loss calculator for runners that will help tell you exactly how much sweat you lost and give you a much more accurate estimation of how much water and electrolytes you need to replace.

As you try different electrolyte supplements be aware of your body responds. Monitor your thirst after your run and the color of your urine. While I have only listed the electrolytes in each of these supplements, some of these options offer vitamin D3, tyrosine, B vitamins and various other ingredients that may help boost your performance and recovery.

I suggest you experiment with these electrolyte supplements that do not have artificial ingredients or colors to determine if you are a drink or capsule person and which flavors fit your tastes the best.


Electrolyte Imbalance – Symptoms – Better Medicine. (n.d.). Local Health Home Page – Better Medicine. Retrieved March 24, 2012.
Frequent Urination in Men and Women: Causes & Treatments. (n.d.). WebMD – Better information. Better health..
Light Yellow Urine Color. Is it Normal? What it means about your health.. (n.d.). Urine Colors – What is Normal? What does Healthy Urine look like? A Guide to Urine Colors and Your Health.
The Endurance Athlete’s GUIDE to SUCCESS | Hammer Nutrition. (n.d.). Fuels & Supplements for the Endurance Athlete | Hammer Nutrition.
Voluntary dehydration and electrolyt… [Aviat Space Environ Med. 1985] – PubMed – NCBI. (n.d.). National Center for Biotechnology Information.

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28 Responses on “Electrolytes for runners: The definitive guide

  1. My favorites for warm weather activity, like you, is Nuun tablets. I also supplement on longer runs with Succeed S!Caps (341mg Sodium and 21mg Potassium and vegetarian friendly). This seems to work well for me. Determining the right combo for me was key in being able to run marathon distance and ultras. And I take it with me in ultras instead of relying on whatever may be available at aid stations.
    My observation has been that some folks are simply more prone to electrolyte imbalance issues than others (GI distress, muscle cramps, bonk). Perhaps these folks add fuel to the fire when drinking extra sugars (Gatorade/Powerade) when they begin to feel dehydrated. Don’t forget to check the labels on your other “in-run” supplements such as gels, sport beans, bars or whatever else you may use.

    • Thanks, James. I like your approach to finding what has worked for you and not relying solely on what is available on course. I think it’s vital that runners experiment in training to find their optimal nutrition strategy so on race day it’s second nature and nothing to worry about.

      Good luck with your upcoming races, looks like you’ve got a long one coming up!

    • James! You make a great point, some people are simply more prone to electrolyte imbalances than others! It is extremely important for people to listen to their own bodies to learn what works best, just like you have! I am glad you have been diligent to determine what works best for you!

  2. I’ve heard a Lott of good things about coconut water/juice for hydration.what is your take on it as a way to replenish electrolytes?

    • Coconut water is a great hydration option, it contains more potassium than a banana and 5 essential electrolytes. One thing you need to be aware of though, is coconut water contains 12 grams of sugar in a 14oz serving. Often runners don’t realize how much sugar they are consuming between their chews/gels during the run and their electrolyte drinks post run.

  3. I’m glad to see non-sugary electrolyte options. Can you please comment on electrolyte consumption and hydrating on recovery days?

  4. Great question, Pebble. In my experience, hydrating and electrolytes on the recovery days is as, if not more important, than the hard days. We all know that we have to drink after a long run in the hot sun, but keeping your electrolytes balanced throughout the entire training week helps the muscles recover (water is essential for recovery) and allows the body to maintain a healthy balance.

    My suggestion is to always have a bottle with you – work, home, walking, wherever. This makes it easy to sip and sometimes you’ll just do it unconsciously because it’s there rather than realizing at 8 o’clock at night that you haven’t drank all day. Hope that helps.

  5. Thanks for the information. Lots of great information. One should also note that if you are taking multivitamins, your urine may appear less “straw colored” and a bit more on the yellow side. I find that NUUN also works best for me. Hard keeping it on hand sometimes.

    • Yes! Great reminder! Your urine can be abnormally bright when taking a B-complex or multi high in the B vitamins!

  6. I think this Guide is missing some important information, which needs some scientific backing. The Sweat Loss Calculator in the provided link does not provide the quantities of electrolytes the body needs per volume of sweat, as stated, “Luckily, we’ve created a very handy sweat loss calculator for runners that will help tell you exactly how much sweat you lost and give you a much more accurate estimation of how much water and electrolytes you need to replace.”

    How can we attempt to balance electrolytes if we don’t know what we’re losing in our sweat? What are the scientific recommendations for replacement of each electrolyte? I don’t rely on supplement manufacturers to provide that info since their opinions can vary widely, as shown by the wide ranges of electrolyte amounts for the products shown. I realize folks may sweat different liquid volumes, but is the percentage of electrolytes in each person’s sweat roughly the same? If so, what are the normal ranges for each electrolyte? Seems like we would want to replace close to what we’re losing in our sweat. So how much of each electrolyte are we losing per volume or per weight loss (say cup or 0.5 lb of sweat)? After we have that info, we can make more informed decisions on supplements.

    • Dan,
      Great questions! Your idea that rehydrating most efficiently would require you to know how much of each electrolyte you sweat out per volume of sweat lost, is absolutely correct. The problem with this is each individual loses electrolytes differently. So The percentages of electrolytes people sweat is not roughly the same and there have not technically been “normal” ranges created. Electrolytes lost per workout even change with each individual, depending on their diet the day before, the level of humidity, the duration of exercise and the state of acclimatization.

      For you to determine which electrolytes you need to replace after each workout you would need to have someone monitoring the electrolyte levels in your blood and urine pre and post every workout you do. At that point you might be able to create some normal ranges for you.

      Because electrolytes are so individual and our bodies are so efficient, a general electrolyte supplement usually contains enough of each electrolyte that our body can use what it needs and pass the rest through.

      Nutrition is very individual and usually requires some self experimentation. I hope you find an electrolyte supplement that works for you and I hope this is helpful.

  7. In Lore of Running, Tim Noakes summarizes sweat electrolyte data from published papers and compares electrolyte concentrations and an individual’s fitness level and heat acclimatization. This data concurs with another study I reviewed, which includes their testing information plus a summary of other published data.

    The sweat electrolyte concentrations in the reviewed materials indicate there is variability between individuals, and the Noakes data below is within the concentration ranges presented by others. While not stated in Lore of Running (and I did not review his sources), I presume the values are averages for each category, so individuals may have sweat with electrolytes above or below these average concentrations. Electrolyte concentration values from other sources had percent standard deviations of approximately 30 percent. Not sure how table will look when posted, I apologize in advance.

    Unacclimatized & Unfit Unacclimatized & Fit Acclimatized & Fit
    Sodium 1.84 1.38 0.92
    Potassium 0.31 0.23 0.16
    Magnesium 0.04 0.04 0.04
    Chloride 1.77 1.42 1.06
    Notes: Values in grams/liter (g/L). Noakes did not define Unacclimatized, Acclimatized, Unfit, and Fit; use your best judgment.

    This information may help folks estimate their electrolyte needs. For comparison, Gatorade and Powerade sodium quantities are 0.46 g/L and 0.23 g/L, respectively, which are below the Acclimatized & Fit sodium value. Hence the need to consider the supplements mentioned in the Guide.

  8. Dan, this is great information, thanks for sharing. 30% is pretty significant, when it comes to standard deviation, so using these figures as guidelines or starting points is a good idea!

  9. Pingback: Running At Midnight: 10 Must Follow Tips For Safe Night Time Running.! | girlgonegood

  10. So, wonderful information on electrolytes! I’ve only one question: being a person who believes in eating about two hours before running or any other workout, should I take in electrolyte supplement immediately before I start off running, and in the event that I get a muscle cramp shouldI take it then and continue running? How long, in other words will electrolytes take to be absorbed and hence take effect?

    • Great question, Jayse. Electrolytes are absorbed pretty rapidly, so you’ll want to take them closer to your run, although having them two hours before won’t hurt. Definitely take electrolytes if you’re experiencing a muscle cramp as it should speed up the process of getting it to release. The exact absorption rate is dependent on a lot of factors, but it’s very fast regardless. Best of luck!

  11. Very helpful article. I live in Florida and previously have relied on salt tabs and Gatorade and coconut water to get me through the summer. In Florida that is April – October. I am also trying to lose weight using weight watchers so the sugar comments are helpful.

    Considering Dans comments and considering the very high sweat loss is one supplement better than others for Floridians?

  12. Pingback: Electrolyte Replenishment - Why Its Important?

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  15. As a runner who goes anywhere from 7-12 miles per run, 3-4 times per week, and as a very salty sweater myself – I definitely eat normal to get keep my sodium levels correct, but, I absolutely hands-down swear by pure coconut water.

    It’s natural, super delicious, and it’s the most hydrating natural liquid that I’m aware of. If pills work for you, great. I personally don’t want to take them, and I think coconut water has them all beat by a long shot with all of the other nutrients it packs. Plus it tastes way better than taking a pill. It’s not uncommon to find cans of it that have 700 mg of potassium per can.

    I’ll drink some before a run, but always post-run… along with 1 cut up banana mixed in with 1 cup of low-fat (not 0%) (high-protein & potassium rich) greek yogurt + a little granola. This simple food & drink combo is super easy on the stomach and seems to provide me with the ultimate in post-run recovery. I’m sure I’ll discover other stuff that helps, but so far this is what I’ve learned through several years of very dedicated running experience in the heat. Hope this helps!


  16. Nice information here. I’ve been looking around for a while for some solid info on electrolytes but it proved to be somewhat hard to come by. Thank you for this article, it gave me a much better understanding. Good to know that special bit on sodium too, because I see a lot of people run out and grab something salty after exercise for the “electrolytes”….Hehe.

    Good stuff,

  17. My fingers will start to swell within the first mile of a run and will get worse as the run progresses, particularly in the summer. They swell to the point they are white between the first and second joint and fingertips will tingle. Are there any other potential issues besides electrolytes that might contribute to this sort of issue? Besides the hands, I feel fine. No cramps, no stomach issues. It goes away within 15 minutes or less when I stop running. I don’t run with my hands at my sides…I tried an electrolyte additive in my water on the last run, no change. It’s possible I just haven’t found the right mix for me but since it happens so quickly I just wonder if there’s another problem.

  18. We just moved and had to start ordering water as the city fluoridates/Chlorinates their supply. The trouble is that it is reverse osmosis. Within a few weeks of living here, we noticed our teeth starting to darken and we were getting muscle cramps. I started running, not long distances, but I found I was getting heart palpitations, so I purcashed a juicer and began juicing two stalks of celery every day which has helped a little. I am interested in using some of the electrolyte tablets you’ve suggested as a way to replace the minerals removed by the water, or if I can find coconut water. Has anyone else had any problems with RO water? Or have any suggestions? Thanks

  19. Great article. I am always skeptical about products that dont show proven scientific research. Nuun and a number of other so called market leading electrolyte replacements also contain artificial colour, flavours, are high in sugar and actually contain few electrolytes. I have found a natural product that you should consider putting on your list called Recovery e21

    I just started using it. As a diabetic and a runner it has been a fantastic addition to my training.

    Keep the good articles coming.


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