Description of Electrolytes
Short summary
4Endurance Electrolytes are effervescent electrolyte tablets designed for hydration during and after physical activity. They help replenish minerals (sodium, potassium, calcium, magnesium) lost through sweating, supporting the maintenance of physical performance during exertion. The product is free of unnecessary calories and suitable for athletes looking for a simple, convenient source of electrolytes in effervescent tablet form.
6.4 / 10Our expert rating
Ingredient quality6.5
Formula transparency9.0
Effectiveness3.5
Safety10.0
Independent testing2.5
How to use
Dissolve 1 effervescent tablet in 200-300 ml of water. Consume up to 4 times daily. The product is recommended for workouts lasting up to approximately 2 hours; for longer workouts, it makes sense to also add carbohydrate intake.
Pros and Cons
Contains a combination of four electrolytes (sodium, potassium, calcium, magnesium) to support hydration during exercise
Magnesium is in the form of magnesium citrate, and potassium in the form of potassium bicarbonate – both considered better-tolerated forms compared to commonly used alternatives
Convenient, calorie-free effervescent tablet dissolved in 200-300 ml of water – available in 6 flavors
Easily adjustable dosing (up to 4 tablets daily) depending on the intensity and duration of exercise
The lower magnesium content (50 mg per tablet) is not sufficient as a standalone magnesium source relative to daily needs
Calcium is in the form of calcium carbonate, which has lower bioavailability than organic forms, but the dose (10 mg) is small and therefore less critical
Contains an artificial sweetener (sucralose) and an anti-caking agent (polyethylene glycol), which may cause digestive issues in sensitive individuals at high daily doses
No publicly available independent laboratory test report
Suitable for
Athletes and recreational exercisers during workouts of up to approximately 2 hours – for easy replenishment of lost minerals
People who sweat heavily in hot weather or during outdoor physical work – to support hydration
Users looking for a calorie-free, convenient form of electrolytes for travel or their bag – effervescent tablet available in 6 flavors
Electrolytes can support muscle function, as sodium, potassium, calcium, and magnesium are involved in muscle contraction and nerve impulse transmission. However, evidence on direct cramp prevention is not conclusive - one study found a slightly lower incidence of exercise-associated muscle cramps with an electrolyte-amino acid mixture compared to a regular carbohydrate-electrolyte drink, but the differences were modest, and the mechanism of cramps is multifactorial, depending also on fitness level, temperature, and individual factors (McIntosh et al., 2024). Therefore, the product cannot be presented as reliably 'preventing' cramps, but rather as support for overall mineral balance during exercise.
The manufacturer recommends up to 4 tablets daily, each dissolved in 200-300 ml of water, which amounts to approximately 1 g of sodium and 280 mg of potassium daily from this product. Do not exceed the recommended daily dose, as excessive mineral intake can disrupt the body's natural electrolyte balance. It is known that during prolonged endurance exertion, severe hyponatremia (excessively low sodium concentration) due to water intake alone without electrolytes is rare, but can be serious (Rangan et al., 2021) - which supports the rationale for moderate electrolyte supplementation, but not arbitrarily high doses.
If you have high blood pressure, cardiovascular disease, or take medications such as diuretics or ACE inhibitors, consult a doctor before using electrolyte products. The sodium and potassium in the product can affect the functioning of such medications or blood pressure regulation, so making an independent decision about supplementation without medical advice is not recommended. The same applies to people with chronic kidney disease, where additional potassium intake can increase the risk of hyperkalemia regardless of the salt form the potassium comes from (Sarnowski et al., 2022).
For shorter, moderate activity (up to approximately 60 minutes), plain water is usually sufficient, as the body does not lose enough electrolytes during this time to necessitate supplementation. Electrolyte products, such as these tablets, are more useful for exercise longer than 60-90 minutes, heavy sweating, or exercise in the heat, where sodium replenishment has been shown to better maintain hydration than water alone (PĂ©rez-Castillo et al., 2024). For the average recreational exerciser with shorter, milder workouts, the product is therefore not essential, but it can be a useful and convenient choice if you want to further boost your mineral intake.
May contain traces of gluten-containing cereals, soy, and milk.
Do not exceed the stated recommended daily dose (up to 4 tablets daily)
People with kidney disease should consult a doctor before use, as additional potassium intake can pose a risk
Pregnant women, breastfeeding mothers, and people taking blood pressure medication or diuretics should consult a doctor before use
The product may contain traces of gluten-containing cereals, soy, and milk
Ingredients
Acidity regulator: citric acid, sodium bicarbonate, bulking agent: sorbitol, magnesium salts of citric acid, potassium bicarbonate, flavoring, anti-caking agent: polyethylene glycol, calcium carbonate, sweetener: sucralose, coloring: riboflavins. May contain traces of gluten, soy, and milk.
Form:Tablets
Dose:1 tablet
Available flavors:6 (Orange, Tropical, Mango-Passionfruit + 3)
Sodium:250 mg
Potassium:70 mg
Calcium:10 mg
Magnesium:50 mg
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