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Choose a flavour
Sweetness 1 of 3, acidity 2 of 3. The least sweet of the three flavours.
Parcel locker 4,99 zł · free from 149 zł · shipped tomorrow
Customer reviews
Reviews were written in Polish and translated into English.
A really good isotonic drink, delicious, and the 2:1 carb blend works with the rest of my race nutrition, which lets me keep a high carb intake during a race without the risk of stomach trouble
Łukasz Kałdowski· verified purchase
I do not know where to start. Everything is as it should be; the flavour does not get boring, it is not too sweet, too sour or too bitter. Spot on. I chose lemonade and I was not disappointed.
Hubert
For you if:
- you train or race for longer than an hour
- you train in heat and sweat a lot
- you want carbohydrates and sodium in one bottle
A carbohydrate-electrolyte solution contributes to the maintenance of endurance performance during prolonged endurance exercise and enhances the absorption of water during physical exercise. One 40 g scoop per 500 ml of water, a 1 kg pack is 25 servings.
Check whether the isotonic drink suits your training.
We ask the same things a sports dietitian asks at a first consultation.
- what to take, how much and when, for your training
- a schedule of servings and dates for the whole period
- free, the result without an email and without a purchase
Who it is for
When it makes sense
- You train for longer than an hour: running, cycling, triathlon, the mountains.
- You train in heat and sweat a lot.
- You want carbohydrates and sodium in one bottle.
- You race in events that last longer than an hour.
It makes no sense for an easy session shorter than an hour. Water is enough then.
How to take it
Serving, timing, method
- How much
40 g of powder1 scoop according to the current product page.
- When
During exerciseEspecially long, intense or in the heat.
- How
500 ml of waterShake for 10 to 15 seconds. Drink in small amounts.
Match the amount of fluid to the conditions and to how much you sweat. Do not exceed the serving stated on the label.
What customers say
How does it work day to day?
4,8/5 9 ratings, 14 reviews
A really good isotonic drink, delicious, and the 2:1 carb blend works with the rest of my race nutrition, which lets me keep a high carb intake during a race without the risk of stomach trouble
Łukasz Kałdowski· verified purchase
I do not know where to start. Everything is as it should be; the flavour does not get boring, it is not too sweet, too sour or too bitter. Spot on. I chose lemonade and I was not disappointed.
Hubert
Show all reviews (14)
Lemon is great, forest fruit is a little on the sweet side, but I will fine tune the amount in my bottles. I train with them every day anyway; good that the Iso has plenty of carbs, you can feel how well it hydrates.
Łukasz Zdanowski
It sits well before and during a hard session, it does not lie heavy on the stomach. The minus is that you have to watch the dilution; too strong and it gets too sweet for me.
Klaudia
On longer road rides it does the job. A good flavour, it does not weigh me down and I have no stomach problems with it.
Kris
I tested it on long runs and it really does the job. For me forest fruit is too sweet, I definitely prefer the citrus one.
Aleksandra Szymańska
I normally never pick orange, but the one from Athlecor is something else entirely. It tastes amazing; I recommend trying it <3
Julia Mróz
The forest fruit flavour was tasty, but the parcel did not arrive before my training camp
Eryk
My husband and I both agree that it is the best isotonic drink we have tried :) we recommend it to all our friends
Julia Kaczmarek
A friend recommended the forest fruit flavour to me and I was not disappointed. New fav <3
Martyna B
A great isotonic drink, I have tried many, but they all had that artificial aftertaste or were overly sweet.
Mario
normally I do not like orange but this one is not chemical, it is pleasant
robert
The forest fruit flavour is the top one. If you have not tried it, I recommend it
Maciek
forest fruit is the best, on my 2nd bag
Mikołaj K
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Add a reviewHow we know it is good
The raw material and the batch test
Osmolality of 284 mOsm/kg was measured by the J.S. Hamilton laboratory for the orange flavour, report 357253/26/GDY.
Batch AC-3.5B-2602-01 was tested by the accredited J.S. Hamilton Poland laboratory, report 357252/26/GDY. Microorganisms and lead, arsenic, cadmium and mercury were checked, the result meets the criterion.
Heavy metal results for this batch: lead < 0.010 mg/kg against a limit of 3.0 mg/kg, arsenic < 0.010 mg/kg, cadmium < 0.0010 mg/kg against a limit of 1.0 mg/kg, mercury < 0.0010 mg/kg against a limit of 0.10 mg/kg. Every result with a limit is within the limit.
| Element | Result in this batch | EU limit |
|---|---|---|
| Lead (Pb) | < 0.010 mg/kg | ≤ 3.0 mg/kg |
| Arsenic (As) | < 0.010 mg/kg | no EU limit |
| Cadmium (Cd) | < 0.0010 mg/kg | ≤ 1.0 mg/kg |
| Mercury (Hg) | < 0.0010 mg/kg | ≤ 0.10 mg/kg |
Microbiology: yeasts and moulds <1.0x10¹ cfu/g, total plate count at 30°C <1.0x10¹ cfu/g, Salmonella, coagulase-positive staphylococci, Escherichia coli and Listeria monocytogenes not detected. Production date 06.03.2026, best before 06.03.2028, report dated 30.04.2026. Metals by PN-EN 15763:2010, accredited test, limits per Commission Regulation (EU) 2023/915. Full scan: report 357252/26/GDY.
Batch AC-3.5A-2602-01 was tested by the accredited J.S. Hamilton Poland laboratory, report 357251/26/GDY. Microorganisms and lead, arsenic, cadmium and mercury were checked, the result meets the criterion.
Heavy metal results for this batch: lead < 0.010 mg/kg against a limit of 3.0 mg/kg, arsenic < 0.010 mg/kg, cadmium < 0.0010 mg/kg against a limit of 1.0 mg/kg, mercury < 0.0010 mg/kg against a limit of 0.10 mg/kg. Every result with a limit is within the limit.
| Element | Result in this batch | EU limit |
|---|---|---|
| Lead (Pb) | < 0.010 mg/kg | ≤ 3.0 mg/kg |
| Arsenic (As) | < 0.010 mg/kg | no EU limit |
| Cadmium (Cd) | < 0.0010 mg/kg | ≤ 1.0 mg/kg |
| Mercury (Hg) | < 0.0010 mg/kg | ≤ 0.10 mg/kg |
Microbiology: yeasts and moulds <1.0x10¹ cfu/g, total plate count at 30°C <1.0x10¹ cfu/g, Salmonella, coagulase-positive staphylococci, Escherichia coli and Listeria monocytogenes not detected. Production date 05.03.2026, best before 05.03.2028, report dated 30.04.2026. Metals by PN-EN 15763:2010, accredited test, limits per Commission Regulation (EU) 2023/915. Full scan: report 357251/26/GDY.
Batch AC-3.5C-2602-01 was tested by the accredited J.S. Hamilton Poland laboratory, report 357253/26/GDY. Microorganisms and lead, arsenic, cadmium and mercury were checked, the result meets the criterion.
Heavy metal results for this batch: lead < 0.010 mg/kg against a limit of 3.0 mg/kg, arsenic < 0.010 mg/kg, cadmium < 0.0010 mg/kg against a limit of 1.0 mg/kg, mercury < 0.0010 mg/kg against a limit of 0.10 mg/kg. Every result with a limit is within the limit.
| Element | Result in this batch | EU limit |
|---|---|---|
| Lead (Pb) | < 0.010 mg/kg | ≤ 3.0 mg/kg |
| Arsenic (As) | < 0.010 mg/kg | no EU limit |
| Cadmium (Cd) | < 0.0010 mg/kg | ≤ 1.0 mg/kg |
| Mercury (Hg) | < 0.0010 mg/kg | ≤ 0.10 mg/kg |
Microbiology: yeasts and moulds <1.0x10¹ cfu/g, total plate count at 30°C 1.4x10³ cfu/g, Salmonella, coagulase-positive staphylococci, Escherichia coli and Listeria monocytogenes not detected. Osmolality of the solution: 284 ± 2 mOsm/kg H₂O. Production date 06.03.2026, best before 06.03.2028, report dated 07.05.2026. Metals by PN-EN 15763:2010, accredited test, limits per Commission Regulation (EU) 2023/915. Full scan: report 357253/26/GDY.
The report does not test how well the supplement works.
Ingredients without guesswork
Check your serving.
Data for the selected variant. Each table states its basis: a serving or 100 g.
Nutrition facts
| Basis | per 100 g | per 40 g serving |
|---|---|---|
| Energy | 339 kcal | 135 kcal |
| Fat | 0 g | 0 g |
| Carbohydrates | 85 g | 34 g |
| of which sugars | 36 g | 15 g |
| Protein | 0 g | 0 g |
| Salt | 1,5 g | 0,59 g |
| Potassium | 249 mg | 100 mg |
| Calcium | 134 mg | 53 mg |
| Magnesium | 50 mg | 20 mg |
Table from the label of the lemonade variant. A 40 g serving is one scoop per 500 ml of water; the label also gives a daily serving of 3 × 40 g and „about 24 servings” per pack (1000 ÷ 40 = 25).
| Basis | per 100 g | per 40 g serving |
|---|---|---|
| Energy | 345 kcal | 138 kcal |
| Fat | 0 g | 0 g |
| Carbohydrates | 86 g | 35 g |
| of which sugars | 38 g | 15 g |
| Protein | 0 g | 0 g |
| Salt | 1,5 g | 0,59 g |
| Potassium | 249 mg | 100 mg |
| Calcium | 134 mg | 53 mg |
| Magnesium | 50 mg | 20 mg |
Table from the label of the forest fruit variant. A 40 g serving is one scoop per 500 ml of water; 0.59 g of salt per serving equals 235 mg of sodium. The label also gives a daily serving of 3 × 40 g and „about 24 servings” per pack (1000 ÷ 40 = 25).
| Basis | per 100 g | per 40 g serving |
|---|---|---|
| Energy | 346 kcal | 139 kcal |
| Fat | 0 g | 0 g |
| Carbohydrates | 87 g | 35 g |
| of which sugars | 35 g | 15 g |
| Protein | 0 g | 0 g |
| Salt | 1,5 g | 0,59 g |
| Potassium | 249 mg | 100 mg |
| Calcium | 134 mg | 53 mg |
| Magnesium | 50 mg | 20 mg |
Table from the label of the orange variant. A 40 g serving is one scoop per 500 ml of water; the label also gives a daily serving of 3 × 40 g and „about 24 servings” per pack (1000 ÷ 40 = 25).
Full ingredient list and allergens
Lemonade:maltodextrin, fructose, potassium (potassium citrate), calcium (calcium salts of citric acid), glucose (dextrose), magnesium (magnesium salts of citric acid), flavouring, acidity regulator: citric acid, salt, sweetener: sucralose
Allergens in the recipe: none. Label warning: the product may contain milk, soy, peanuts, gluten-containing cereals and eggs.
Forest fruit:maltodextrin, fructose, potassium (potassium citrate), calcium (calcium salts of citric acid), glucose (dextrose), magnesium (magnesium salts of citric acid), flavouring, acidity regulator: citric acid, salt, sweetener: sucralose
Allergens in the recipe: none. Label warning: the product may contain milk, soy, peanuts, gluten-containing cereals and eggs.
Orange:maltodextrin, fructose, potassium (potassium citrate), calcium (calcium salts of citric acid), glucose (dextrose), magnesium (magnesium salts of citric acid), flavouring, acidity regulator: citric acid, salt, sweetener: sucralose
Allergens in the recipe: none. Label warning: the product may contain milk, soy, peanuts, gluten-containing cereals and eggs.
Sources
- Jeukendrup A., 2014, a review of carbohydrates during exercise (30 to 60 and 60 to 90 g per hour).A Step Towards Personalized Sports Nutrition: Carbohydrate Intake During Exercise. Sports Medicine 44 (Suppl 1):25. DOI
- Viribay A. et al., 2020, a study of 120 g of carbohydrates per hour in trained runners during a mountain marathon.Effects of 120 g/h of Carbohydrates Intake during a Mountain Marathon on Exercise-Induced Muscle Damage in Elite Runners. Nutrients 12:1367. DOI
- Maughan R. et al., 2018, the International Olympic Committee consensus statement on supplements.IOC consensus statement: dietary supplements and the high-performance athlete. British Journal of Sports Medicine 52:439. DOI
- J.S. Hamilton Poland report 357253/26/GDY: osmolality of the orange-flavoured drink, 284 ± 2 mOsm/kg (that variant only).
The links lead to the publication records (DOI or PubMed).
A food supplement complements your diet. It does not replace varied nutrition or a healthy lifestyle.
Good to know before buying
Have a question?
Water delivers fluid. Isotonic also delivers carbohydrates and electrolytes. For a short, easy session water is usually enough. A longer or intense effort may also need energy and sodium planned in.More in the guide (in Polish): Woda, izotonik czy napój energetyczny: co pić podczas wysiłku
Isotonic is for making a drink with carbohydrates and electrolytes. Energy drinks often contain caffeine and have a different formula. Check the specific ingredients, not every energy drink has the same properties.More in the guide (in Polish): Woda, izotonik czy napój energetyczny: co pić podczas wysiłku
Lemonade is the least sweet, forest fruit the sweetest and least sour, and orange sits in between. Try the flavour during training too: when you are tired you may prefer something different than at home.More in the guide (in Polish): Trening jelita: jak sprawdzić napój, żele i smak przed zawodami
By recipe, Isotonic contains no caffeine. If you take caffeine separately, you set its amount independently of the drink. The absence of caffeine is not a promise that the product will never affect sleep.More in the guide (in Polish): Woda, izotonik czy napój energetyczny: co pić podczas wysiłku
During exercise, carbohydrates can be a planned source of energy. That does not make a sweetened drink necessary all day. Allow for your whole diet, the length of the session and oral hygiene.More in the guide (in Polish): Woda, izotonik czy napój energetyczny: co pić podczas wysiłku
Show all questions (19)
Frequent contact with sugar and an acidic drink can favour caries and enamel erosion. Use the drink as your training needs it, rinse your mouth with water afterwards and keep up regular dental hygiene.More in the guide (in Polish): Trening jelita: jak sprawdzić napój, żele i smak przed zawodami
Yes, 15 g of sugars per serving from fructose and glucose, with the rest of the carbohydrates from maltodextrin. Additionally sweetened with sucralose.
The label gives a recommended daily serving of 3 × 40 g, so up to 120 g on days of long efforts.
The same powder in more water: 40 g per 750 ml. The drink is then less concentrated than body fluids. That version is for days when topping up fluids matters more than carbohydrates.
Yes. You can buy every product on its own, without a bundle and without the survey. A bundle is the easier choice when you want the timings written out and the whole plan in one basket.
Amounts and servings come from the product label. Statements about what the ingredients do rest on the list of claims authorised in the European Union, and sports schedules on the publications named next to the sentence. The batch test report covers the tested sample, not how well the product works.
No. For short, easy sessions water is enough. Judge the need for carbohydrates and sodium by duration, intensity and temperature.More in the guide (in Polish): Woda, izotonik czy napój energetyczny: co pić podczas wysiłku
Stick to 40 g per 500 ml. A higher concentration changes the drink and more often upsets the stomach.
A working range is 400 to 800 ml per hour. Match the amount to your sweat rate, the weather and your pace. Do not drink beyond need just to meet a table.More in the guide (in Polish): Żele, napój i jedzenie podczas wysiłku: policz węglowodany i płyny osobno
30 to 60 g per hour for efforts of 1 to 2.5 hours, 60 to 90 g for longer ones. The 90 to 120 g range needs preparation and a separate assessment. Count carbohydrates from the drink, gels and food together.More in the guide (in Polish): Żele, napój i jedzenie podczas wysiłku: policz węglowodany i płyny osobno
Add up carbohydrates from every source. 500 ml of the drink made with 40 g of powder is 35 g, a gel adds 25 g, so 60 g together. Plan fluids separately.More in the guide (in Polish): Żele, napój i jedzenie podczas wysiłku: policz węglowodany i płyny osobno
Testing step by step in training how much drink and how many carbohydrates you tolerate. Do not start with the largest serving and do not try a plan for the first time on race day.More in the guide (in Polish): Trening jelita: jak sprawdzić napój, żele i smak przed zawodami
Yes. It usually comes down to the serving, the concentration or your own tolerance. Prepare it to the stated ratio and test it in training. Do not treat recurring complaints as normal.More in the guide (in Polish): Trening jelita: jak sprawdzić napój, żele i smak przed zawodami
Plan fluids and carbohydrates from all products together. Test the strategy in training first.
In a bundle: Hydration, 158 zł
Two bags of Isotonic in the flavours you choose and a 950 ml bottle, 40 servings.See the bundle
Is this for you?
See whether Isotonic fits your training.
A few questions about your training and diet. You see the result right away, without giving an email: whether this product makes sense in your plan, in what serving and when to take it.
Check in the survey
In use
Before a ride: a scoop into the bottle, 500 ml of water.
Natalia Dominiak, modern pentathlon, making Isotonic before a bike session. A bag, a scoop, a bottle and tap water. That is all it takes.
A frame from Natalia Dominiak's Instagram reel (an athlete who works with ATHLECOR).