Electrolytes vs. Salt: Does Adding Salt to Water Actually Hydrate You?

It's become pretty trendy to add salt to water for hydration, with influencers and athletes swearing by it. While there's some truth to the idea, there's a bigger picture. It's pretty important to know the difference between electrolytes as a whole and salt if you want to get your hydration right, especially if you're active.

Is Salt an Electrolyte?

Salt (sodium chloride) is an electrolyte. When it's dissolved in water, it splits into sodium and chloride ions, which both carry an electrical charge and help regulate fluid balance, nerve impulses, and muscle contractions. Sodium is the main electrolyte lost in sweat and it's crucial for keeping your blood volume and pressure steady. 

But sodium is just one of several electrolytes your body depends on, including potassium, magnesium, calcium, and chloride, each with its own role in muscle, nerve, and cellular function, which is why paying attention to all the electrolytes is so important.

Does Salt Help With Hydration?

Salt can be a powerful hydration tool when used correctly. Sodium acts like a sponge in your body, helping you hold onto fluids instead of just losing them through urine. If you've been sweating through a tough session in the heat, a bit of sodium helps restore your blood volume and gets you back to baseline much faster.

For shorter, less intense sessions in comfortable conditions, plain water typically does the trick, especially since your regular meals likely already provide enough sodium. But salt really comes into play during those longer, sweaty sessions, endurance training, or working out in the heat since that's when your body's sodium levels really take a hit.

What Happens If You Drink Salt Water?

Sodium does help with hydration, which is the idea behind oral rehydration solutions (ORS), combining sodium, glucose, and water to speed up rehydration after exercise or illness. 

However, drinking heavily salted water on the regular is a different story. Research on people who drink naturally saline water links chronic high sodium intake to issues like high blood pressure, kidney strain, and cardiovascular problems. One study even found that young adults who regularly consumed a lot of salt had poorer hydration levels, even though they drank more fluids than most people.

So does salt dehydrate you? Not directly, and in moderate amounts around exercise it does the opposite. But making salty water a daily habit outside of training can backfire. It's the dose and the timing that make all the difference.

Benefits of Drinking Salt Water

The salt water benefits that hold up to scrutiny are linked mostly to exercise and recovery. Drinks with sodium are actually way more effective at helping you rehydrate after a workout than plain water because they help your body hold onto fluids, cut down on urine output, and restore your plasma volume. 

During those long or especially hot sessions, getting some sodium in with your fluids is also key for avoiding exercise associated hyponatremia, a potentially dangerous drop in blood sodium that happens when you drink huge amounts of plain water without replacing the electrolytes you're losing.

Salt capsules can also work well for endurance athletes. One study on half-Ironman participants found that taking salt during the race helped them maintain sodium levels and lose less body weight, with some athletes even finishing faster.

Aside from exercise, though, the benefits of salting your water are pretty limited. Most people already get plenty (often more than they need) of sodium from their regular diet, so adding extra salt to your everyday water usually isn’t necessary and might just lead to an unnecessary surplus over time.

Drinking Sodium During Workouts

If your workouts are longer than an hour, you're running in the heat, or if you're a heavy sweater, getting some sodium in during your workout becomes way more important.

Sports nutrition guidelines suggest that athletes who lose significant amounts of sweat aim for roughly 300 to 600 mg of sodium per hour. You can get this through an electrolyte supplement, salt tablets, or even salty snacks during longer events. It's why salt tablets and running go hand-in-hand for so many endurance athletes, especially during marathons or triathlons in warm conditions.

Just keep in mind that more sodium isn’t automatically better. Taking in huge doses doesn’t consistently boost endurance performance, and a personalized strategy based on your own sweat rate usually works much better than a blanket approach. A common way to do this is to weigh yourself before and after a workout, which can give you a pretty good picture of your specific sweat losses.

How to Raise Sodium Levels

If you're dealing with low sodium after a long training session or an illness, eating something salty is typically the easiest fix. Food naturally provides sodium along with all the other nutrients your body needs. If you're wondering how to replenish electrolytes with salt a bit faster, an electrolyte beverage specifically formulated for exercise like Purist® Hydration Powder is a great option because it combines a truly balanced amount of sodium with other electrolytes in an ideal amount of over 800mg total electrolytes per serving.

If you want to know how much salt to add to water for hydration, a common starting point is roughly a quarter teaspoon (about 500 to 600 mg of sodium) per liter of water during or after exercise. But keep in mind that this is just a rough guideline, and plain table salt only replaces sodium and chloride. It doesn't provide the potassium or magnesium that your body also loses when you're really sweaty. For most people, a multi-electrolyte drink or a sodium supplement specifically for exercise is more practical and complete.

General daily sodium guidance usually sits around 1,500 to 2,300 mg for adults, and the reality is that most people already hit or exceed that through their regular food. Athletes don't typically need more sodium on a day-to-day basis than the general population, either, since your kidneys and sweat glands are pretty efficient at adapting to your regular intake.

Takeaway

Salt only replaces sodium and chloride, but intense exercise actually depletes a whole range of minerals. Letting those electrolyte levels get out of balance can really take a toll on your energy and recovery. Opting for multi-electrolyte drinks that include potassium and magnesium typically does a much better job of supporting your cellular function and fluid balance than just sodium alone, which might also help cut down on those post-exercise cramps.

FAQs

Do Electrolytes Give You Energy?

While electrolytes don't have calories, they are crucial for your body to have energy. When sodium and potassium get out of whack, fatigue and poor performance are almost guaranteed to follow.

How Much Sodium Do Athletes Need Per Day?

General sodium recommendations are 1,500 and 2,300 mg per day, and most athletes are no different since the kidneys are so good at adapting to your typical intake. Extra sodium for athletes is only important during exercise, where getting 300 to 600 mg per hour helps offset sweat losses. For ultra-endurance events in the heat, though, a personalized plan based on your own sweat rate and sodium losses is usually the way to go.

Are Sodium Supplements Worth It?

Sodium supplements like salt capsules can be a great tool for endurance athletes during long, hot training where you're losing a lot of sweat. But for typical everyday training and hydration, a balanced electrolyte beverage or even a salty meal after your workout is ideal. 

Rachel MacPherson is a Nutrition Coach and health writer with over a decade of experience sharing science-backed information in the health and wellness space.

This article was reviewed by Rosie Borchert, NASM-CPT, for accuracy.