Most runners have probably heard that electrolytes are essential for staying hydrated and running well, especially in warm conditions. But with so much information and so many options available, it can be difficult to know if you actually need extra electrolytes or when to use them.
Electrolytes are minerals that help regulate fluid balance, muscle contractions, and nerve function. As you sweat during a run, you lose both water and electrolytes, especially sodium. Replacing those losses at the right time can help maintain hydration and reduce the risk of issues like muscle cramping and fatigue during longer workouts.
Not every run requires electrolytes. Your electrolyte needs depend on factors such as the duration and intensity of your run, the weather, and how much you sweat. Understanding when electrolytes are beneficial vs when plain water is enough can help you create a hydration plan that supports your training.
Let’s talk about why electrolytes matter for runners, which minerals are most important, when to use electrolytes, and practical tips for staying properly hydrated before, during, and after your runs.
What Are Electrolytes?
Electrolytes are essential minerals that help with many key functions in the body. They facilitate communication between muscles and nerves by moving in and out of your cell walls. Their primary functions include fluid balance, muscle function, nerve signaling, and balancing pH levels.
The main electrolytes include sodium, potassium, magnesium, calcium, and chloride. Usually for everyday hydration plain water is enough, especially if you are eating a balanced diet. Sports drinks and other products can help replace lost electrolytes during prolonged exercise or illness.
Why Are Electrolytes Important for Runners?
When we run and sweat we lose both water and electrolytes. You may experience fatigue, muscle cramps, reduced performance, or even more serious conditions like hyponatremia (dangerously low blood sodium) if they are not replaced.
Sometimes water alone isn’t enough to stay hydrated. Using electrolytes can help your body retain the fluids that you drink. If you have ever felt like you were drinking lots of water and still thirsty, this may be why.
Electrolytes also support muscle contractions and can play a role in cramping. Additionally, they help with nerve function, and low electrolytes could result in feelings of weakness or sluggishness.
Replacing electrolytes appropriately can help with overall performance, delaying fatigue and reducing the risk of dizziness and headaches. It can also help with recovery after a run.
How Do Runners Lose Electrolytes?
As your body works to regulate its core temperature during a run, it produces sweat that pulls these essential minerals out of your system. Running in the heat and humidity causes more sweat, resulting in higher electrolyte loss.
Everyone has different sweat rates, which is why some people may feel like they are more affected by running in the heat more than others.
Sodium and chloride are lost in the greatest amounts. They are the primary electrolytes found in the the fluid outside your cells from which sweat is produced. Sodium plays a major role in regulating body fluids, and chloride is the negatively charged electrolyte that pairs with positively charged sodium to maintain electrical neutrality in body fluids.
Signs You May Need More Electrolytes
If you are someone who finishes a run and notice that your body is caked with salt, you are likely a salty sweater and may need more electrolytes. Some signs to look out for are muscle cramps, fatigue, dizziness, headaches, or decreased performance.
Of course these symptoms could have other causes, but you can try to rule out electrolytes being the issue by increasing your intake.
Best Sources of Electrolytes for Runners
Runners often get electrolytes through sports drinks or hydration powders. Electrolyte tablets are another option. Some gels now have electrolytes in them, and you can also get some from whole foods.
Here are a few options
| Type of Electrolyte Product | Examples |
| Sports Drinks | Gatorade, Powerade, Maurten Drink Mix, Tailwind |
| Electrolyte Powders | LMNT, Nuun Sport Powder, Skratch, Liquid I.V. |
| Electrolyte Tablets | Nuun Sport Tablets, GU Hydration Drink Tabs, Precision Hydration Tabs |
| Electrolyte Capsules | SaltStick Caps, Precision Hydration Electrolyte Capsules |
| Electrolyte Chews | GU Energy Chews, SaltStick FastChews |
| Electrolyte Gels | Maurten Gel 100, GU Roctane Energy Gel, Honey Stinger Gel, Huma Chia Plus Energy Gel |
| Ready-to-Drink Electrolyte Beverages | BODYARMOR Flash I.V., Gatorade Endurance, Pedialyte Sport |
When Should Runners Take Electrolytes?
Electrolytes can be helpful before, during and after a run. The timing depends on some specific factors.
Consider taking electrolytes before a run if you’re running for 90 minutes or longer, training in hot/humid weather, and if you’re a salty sweaty. Having a drink with electrolytes 30–60 minutes before your run can help you begin your run well hydrated, especially if conditions are warm.
Electrolytes become increasingly important during long runs more than 90 minutes, in hot/humid conditions, and during high intensity workouts. During these runs, your body loses electrolytes through sweat. Replacing some of those losses can help maintain hydration and support muscle and nerve function.
If you are unsure of where you start, try consuming 300–600 mg of sodium per hour for runs 90 minutes or longer. Some heavy sweaters may need more than that.
After a run, electrolytes are especially important if you lost a significant amount of sweat. Pairing electrolytes with fluids and a balanced meal containing carbohydrates and protein can help speed recovery.
How Many Electrolytes Do Runners Need?
Electrolyte needs vary based on sweat rate, sweat sodium concentration, workout duration, weather, body size, and individual physiology. It’s most helpful to focus on sodium, since it’s lost in the greatest amounts through sweat. For 60-90 minute runs, try 200-400 mg/hour. For runs over 90 minutes, try 300-600 mg/hr. Heavy or salty sweaters may need up to 600-1,000mg (or more)/hr.
Final Thoughts about Electrolytes
Keep in mind that electrolytes are not needed for every run, but they get more important as runs get longer, hotter, or more intense. Every runner has different electrolyte needs, so you may need to experiment to see what works for you. Be sure to practice taking electrolytes on your training runs so you can go into race day prepared.
Do you use electrolytes during training?
You may also like:
How to Carb Load Before a Marathon or Half Marathon
Pre-Run Snack Ideas For Morning Runners
The Ultimate Guide to Preparing for a Long Run (Fueling, Gear & Mindset)
Now it’s time for the Runners’ Roundup! Link up your running and fitness posts below! Join myself, Coach Debbie Runs, Confessions of a Mother Runner and Runs with Pugs to post your favorite running tips, experiences, race and training recaps, workouts, gear, and coaching ideas.
Great info, Lisa! I actually didn’t know that Maurten gels contained any sodium at all! I always think of them as a carb source rather than an electrolyte source.
I have a salt tablet that I found in Cape Town, and taking one before a run makes a huge difference to my training. I would never start a race without it! It was interesting to read about the different ways of getting electrolytes in.
Great information. I have found, as I’ve gotten older, that my need for electrolytes has increased. I usually even have them in my water bottle during the day. If I don’t, I tend to get muscle cramps (at night, ouch!), headaches, and just feel a little off.
I feel like electrolytes have become kind of trendy. People are adding electrolytes to their coffee and their water on the way to Target and I don’t know that we really need quite that many of them. Unless you live in Florida where you step outside into triple digits and immediately sweat out everything you need to survive. This is such a useful breakdown!