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Electrolyte Tablets vs. Isotonic Drinks: Which is Best for Endurance Athletes

By Jack Barkerisotonic drink vs electrolyte drink
Bottom line
Electrolyte drinks help replace salts lost through sweat. Isotonic drinks usually go one step further by combining fluid, electrolytes and carbohydrate, making them more useful when you need hydration and energy during longer or harder endurance sessions.
Electrolyte Tablets vs. Isotonic Drink Powders: Unraveling the Best Energy Source for Endurance Athletes - Kendal Mint Co®

Quick answer

The direct answer

Electrolyte drinks help replace salts lost through sweat. Isotonic drinks usually go one step further by combining fluid, electrolytes and carbohydrate, making them more useful when you need hydration and energy during longer or harder endurance sessions.

Electrolytes are having a moment. Tablets, sachets, powders, drinks — apparently sweat has gone mainstream. Useful? Absolutely. An energy source? Not by themselves.

Proper hydration and an effective energy source are crucial for optimal performance in endurance athletes. This post will introduce you to Kendal Mint Co®, a company dedicated to providing quality energy sources for athletes. We will discuss the science behind hydration and energy, and compare electrolyte tablets and isotonic drinks.

The Science Behind Hydration and Energy for Athletes

Endurance sports require the body to use energy over a prolonged period. Hydration is key to maintaining peak performance during this time, as it helps regulate body temperature and lubricate joints but it isn't enough to just drink more water. That's where Electrolytes come in.

The key thing to remember is simple: electrolytes support hydration, but carbohydrates provide energy. If you are out for a long run, ride, race or hike, hydration is only one half of the job. The other half is fuel.

What are Electrolytes?

Electrolytes, minerals that conduct electricity when dissolved in water, help balance the amount of water in your body and ensure your muscles, heart, and brain work optimally. Their charge helps pull water from your blood into your muscles. The important electrolytes for athletes are sodium, magnesium, calcium and potassium. Electrolytes are necessary for a variety of things, like hydration, muscle contraction and blood pressure. Certain electrolytes, like sodium and potassium, are lost in sweat and need to be replaced to maintain the proper fluid balance in the body. 

Read more about "Why you should be topping up your Electrolytes" here.

Understanding Electrolyte Tablets

Electrolyte tablets are supplements designed to replenish the body's electrolytes. They are convenient, easy to carry, and easy to mix and dissolve in water. However, they may not provide immediate hydration. Electrolyte tablets also aren't to be mistaken for fuel, as most contain barely any calories or carbohydrates. Their main aim is to aid hydration, replacing salts lost through sweat as well as helping the body to take fluids into our systems better than water alone.

This is where a lot of athletes get caught out. They take electrolytes because they feel tired, then wonder why the legs still have the enthusiasm of wet cardboard. Electrolytes help replace salts. Carbohydrate fuels the work.

If you rely on electrolyte tablets alone during endurance exercise, you still need to carry something else for energy: energy gels, bars, food, or an isotonic drink that includes carbohydrate. Otherwise you may be hydrated, but still running on vibes.

For optimal results, take electrolyte tablets before (pre-loading), during, and after your workout.

Understanding Isotonic Drink Powders

Isotonic drinks contain similar concentrations of salt and sugar as the human body. They can provide hydration and carbohydrate energy together, making them ideal during workouts, longer sessions and races. They are slightly less convenient to carry than a small tube of tablets, but they can contain the carbohydrates required for optimal performance and prolonged efforts. For optimal results, consume isotonic drinks before, during and after your workout.

Electrolyte Tablets vs. Isotonic Drinks: A Comparison

Both electrolyte tablets and isotonic drinks can be effective for hydration. The difference is energy. Tablets are more convenient and portable, while isotonic drink powders provide more substantial, all-round nutrition, including a good concentration of carbohydrate for energy. In terms of cost-effectiveness, tablets and Isotonic drink powders are roughly the same per serve.

As an example a High5 Zero tablets contain 0g of Carbohydrate and all 4 Electrolytes, whereas KMC ISO MIX contains 34g of Dual Charge Carbohydrate and all of the required Electrolytes.

Choosing the Best Energy Source for You

Your choice between electrolyte tablets and isotonic drinks depends on your individual needs and preferences. Consider the type of sport, duration of activity, and your personal preference. If the job is hydration, tablets can work. If the job is hydration plus energy, an isotonic drink mix is more complete. If you really want to max out your performance, the Isotonic Drink Mix is for you.

Which should you choose?

  • Choose electrolyte tablets when hydration is the main job and you have another energy source.
  • Choose an isotonic drink when you also need carbohydrate energy.
  • Use gels alongside either option when the session is longer, harder, or race-specific.
  • Practise your setup before race day, because your stomach does not care how tidy the plan looked on paper.

Both electrolyte tablets and isotonic drinks have their unique benefits. We encourage you to try both from Kendal Mint Co® and see which works best for you. Just do not ask an electrolyte-only tablet to do an energy gel's job. It will not appreciate the promotion.

Where ISO MIX fits

KMC ISO MIX is the bottle-based option for athletes who want carbs, fluid and electrolytes together. It fits long runs, rides, hot conditions and sessions where carrying multiple gels is annoying, because every 500ml serving gives you 34g of Dual Charge Carbohydrate plus electrolytes.

Explore Kendal Mint Co®'s selection of electrolyte-containing isotonic drink mixes. Share your experiences with our products and join the community of endurance athletes who trust Kendal Mint Co®.

Rehydrate, refuel and recharge

Expert note

For longer endurance sessions, hydration and fuelling should be planned together. Electrolytes help replace salts lost through sweat, while carbohydrate helps supply usable energy. The best option depends on session length, intensity, weather and what the athlete has practised in training.

FAQ

Frequently asked questions

Q: What are electrolytes?

A: Simply put , electrolytes are electrically charged minerals which have a key role in many bodily functions, specifically fluid balance. Their charge helps pull water from your blood into your muscles. The important electrolytes for athletes are sodium, magnesium, calcium and potassium.

Electrolytes are necessary for a variety of things, like hydration, muscle contraction and blood pressure. Certain electrolytes, like sodium and potassium, are lost in sweat and need to be replaced to maintain the proper fluid balance in the body.

You can find them in most of our products for this reason, particularly KMC ISO MIX.Read more about electrolytes here.

Q: Do Electrolytes help with Cramps?

A: Yes - Cramping is caused by a deifiency in electrolytes. Electrolytes are lost through sweating, particularly when exercising vigorously. A deficiency in Electrolytes can also cause fatigue, weakness, tingling, or confusion–none of which are pleasant.

Q: How do I know if I need to take on more Electrolytes?

A: There is no hard rule for electrolyte consumption.

However, the difference in alertness when you are dehydrated is very noticeable and immediate. Other clear symptoms of dehydration are a headache, dizziness, extreme fatigue or muscle cramps.

You can also use your urine colour as an indicator for whether you are hydrated enough throughout the day. Read more here.

Q: What is the difference between Electrolyte Tablets and Isotonic Drink Powders?

A: Both electrolyte tablets and isotonic drinks are effective for hydration and energy replenishment. Tablets are more convenient and portable, while isotonic drink provide more substantial, all-round nutrition. Including a good concentration of Carbohydrate for energy. In terms of cost-effectiveness, tablets and Isotonic drink powders are roughly the same per serve.

Read More: Electrolyte Tablets vs. Isotonic Drink Powders: Unraveling the Best Energy Source for Endurance Athletes

Are electrolyte drinks the same as isotonic drinks?

Not quite. Electrolyte drinks are mainly designed to help replace salts lost through sweat. Isotonic drinks usually combine fluid, electrolytes and carbohydrate, so they can support hydration and provide energy during longer or harder sessions.

Do electrolyte drinks give you energy?

Electrolytes themselves do not provide meaningful energy. They help with hydration by replacing minerals such as sodium lost through sweat. For energy during exercise, look for carbohydrate from an isotonic drink mix, energy gel, bar, or food.

When should I use an isotonic drink instead of electrolyte tablets?

Use an isotonic drink when you need hydration and carbohydrate at the same time, especially during longer runs, rides, races, or warm-weather sessions. Electrolyte tablets can be useful when hydration is the main goal and you are getting energy from food, gels, or a shorter session does not need much extra fuel.

Can I use isotonic drink mix with energy gels?

Yes, you can use isotonic drink mix with energy gels, especially during longer endurance sessions. Just keep an eye on total carbohydrate intake and practise the combination in training first. Your race-day stomach deserves fewer surprises.

Are isotonic drinks good for running?

Isotonic drinks can be useful for running when the session is long, hard, hot, or race-specific. They give you fluid, electrolytes and carbohydrate in one bottle. For short or easy runs, water or an electrolyte-only drink may be enough.

What should I drink during a long bike ride?

For a long bike ride, most riders should plan for fluid, electrolytes and carbohydrate. An isotonic drink mix can help cover all three in one bottle, while gels or bars can add extra fuel as the ride gets longer. Test your drink mix and gel timing before event day, not halfway up a climb wondering what went wrong.