Sport & Hydration
Electrolytes and hydration: when do electrolytes make sense?
What are electrolytes?
Electrolytes are minerals that occur in body fluids in charged form. They include, among others:
- sodium;
- potassium;
- chloride;
- magnesium;
- calcium.
When are electrolytes present as ions in water?
For mineral salts, chemists usually speak of dissociation rather than ionisation: in the solid salt, the ions are bound in the crystal lattice; when dissolved in water, they become freely mobile, for example as sodium⁺ and chloride⁻. A dry electrolyte powder is therefore not simply "ionised" – what matters is that the mineral compound used dissolves sufficiently in the prepared liquid and provides ions. 5
They are involved in various normal body functions. For magnesium, the following claims, among others, are authorised, provided the specific product meets the legal conditions of use — for minerals, at least 15% NRV per daily portion: 1
Magnesium contributes to normal muscle function.
Magnesium contributes to electrolyte balance.
Is normal water enough in everyday life?
On an ordinary day without intense heat or unusual physical exertion, a special electrolyte drink is usually not essential.
Fluid is taken in not only through drinks but also through food. At the same time, normal meals provide minerals.
The situation can be different when fluid and salt losses increase significantly. Individual requirements vary. Body size, outside temperature, training duration, intensity, clothing and personal sweat rate all play a role.
When can electrolytes make sense?
During longer or intense exercise
If you train for a long time or sweat heavily, you lose not only water but also electrolytes. The German Nutrition Society (DGE) points out that a balanced fluid and electrolyte status is relevant for athletic performance. At the same time, both too little and excessive fluid intake can be problematic. 2
In hot weather
On hot days, fluid requirements often increase. Drinking regularly can become important, especially during physical work, exercise or long periods outdoors. As a simple guide for hot weather, the DGE recommends drinking regularly throughout the day rather than only reacting very late to strong thirst. 3
With heavy sweating
People differ considerably in how much they sweat and how salty their sweat is. White salt marks on clothing can indicate higher salt loss, but they don't replace a medical examination.
Not automatically for every short activity
For a walk, a light training session or a normal day at the office, an electrolyte product is not automatically necessary. The product should match your level of exertion, your diet and your actual needs.
Electrolyte powder is not the same as an isotonic drink
The terms are often mixed up.
Electrolyte product
An electrolyte product provides selected minerals. It can be sugar-free, low in calories or contain carbohydrates. The exact composition is decisive.
Carbohydrate-electrolyte solution
The EU claims on water absorption during physical exercise and on the maintenance of endurance performance come with precise requirements for energy content, types of carbohydrate, sodium content and osmolality.
That's why not every powder containing magnesium, potassium or sodium may be called "isotonic" or advertised as improving water absorption. 1
ORS – oral rehydration solution
ORS is a standardised glucose-electrolyte solution for treating or preventing dehydration, particularly with diarrhoeal illness. It is not the same as a normal sports or lifestyle electrolyte drink. In the case of significant dehydration, persistent diarrhoea, vomiting or circulatory problems, medical advice is required. 4
What should you look for in an electrolyte product?
Check the following details:
- Which electrolytes does it contain?
- What amount does the actual daily portion provide?
- How much water is recommended for preparation?
- Does the product contain sugar, sweeteners or other active ingredients?
- What use is it offered for?
- How many portions may be taken per day?
A product for normal everyday life doesn't need to have the same composition as a drink for long endurance sessions.
Drinking more is not always better
In hot weather and during exercise, drinking enough is important. However, very large amounts of water in a short time can also be problematic, especially during long endurance sessions.
The more sensible rule is therefore not "as much as possible", but:
Adapt your fluid intake to your exertion, sweat loss and individual situation.
Who should be particularly careful?
Seek professional advice before taking an electrolyte product in the case of:
- kidney or heart disease;
- fluid restriction prescribed by a doctor;
- regular medication;
- pregnancy or breastfeeding;
- persistent vomiting or diarrhoea;
- clear signs of dehydration.
Conclusion
Electrolytes are not a must-have product for every day and every person. But they can be a practical addition when fluid and salt losses are increased by exercise, heat or heavy sweating.
What matters is not just the word "electrolytes" on the pack, but the composition, dosage and specific purpose.
Mandatory notices: Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Do not exceed the stated recommended daily dose.
Related
You'll find more products for sport and active routines in our Sport & Fitness category.
Frequently asked questions
Do I need electrolytes every day?
In normal everyday life, usually not. An increased need can arise in hot weather, during long exercise or with heavy sweating.
Are electrolytes and magnesium the same thing?
No. Magnesium is an electrolyte, but a complete electrolyte product may also contain sodium, potassium, chloride or calcium.
Is every electrolyte drink isotonic?
No. Specific conditions apply to the composition of a carbohydrate-electrolyte solution and to the corresponding health claims.
Does "ionised" mean better absorption?
No. "Ionised" is not a quality feature and not an authorised benefit. What matters is that the mineral compound used dissolves sufficiently in the prepared liquid. 5
Do normal electrolyte sticks help with diarrhoea?
A normal lifestyle or sports product is not automatically an ORS solution. In the case of diarrhoea and dehydration, use a solution intended for this purpose or seek medical advice.
Are sugar-free electrolytes better?
Not necessarily. Sugar-free can suit certain dietary preferences. For long periods of exercise, however, carbohydrates can serve a different function. What matters is the purpose.
Sources
Sources as of: 13 August 2026.
- EU Register / Regulation (EU) No 432/2012 – health claims for minerals and carbohydrate-electrolyte solutions
- DGE: Fluid management in sport (in German)
- DGE: Eating and drinking in hot weather (in German)
- WHO: Oral rehydration salts – production of the new ORS
- IUPAC Compendium of Chemical Terminology (Gold Book): "dissociation" – definition
