Name: ATHLECOR Isotonic
Brand: ATHLECOR
SKU: 3.5
Price: 79 PLN
Availability: InStock
Rating: 4.75 (8 reviews)

Why this product

40 g per 500 ml. Measured, not declared.

Three decisions in this powder: a ratio that is easy to measure, sodium stated as sodium, and osmolality checked in a laboratory.

40 g per 500 ml of water

One scoop per bottle. 34 g of carbohydrates from maltodextrin, fructose and glucose, of which 15 g are sugars; 135 kcal per serving.

One scoop per bottle. 35 g of carbohydrates from maltodextrin, fructose and glucose, of which 15 g are sugars; 138 kcal per serving.

One scoop per bottle. 35 g of carbohydrates from maltodextrin, fructose and glucose, of which 15 g are sugars; 139 kcal per serving.

235 mg of sodium per serving

That is 470 mg of sodium per litre of drink. We state sodium, not salt: 0.59 g of salt per serving is the same amount written differently.

Osmolality 284 mOsm/kg

Measured at the J.S. Hamilton laboratory for the orange flavour, report 357253/26/GDY, cryoscopic method. For the other flavours the result is not in the reports.

Natalia Dominiak wsypuje miarkę Isotonic do bidonu przed jazdą na rowerze

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).

During training

Isotonic

A drink for the effort itself

How much40 g of powder

1 scoop according to the current product page.

WhenDuring exercise

Especially long, intense or in the heat.

How500 ml of water

Shake for 10 to 15 seconds. Drink in small amounts.

In practice

Keep the ratio of powder to water. More powder in the same water changes the concentration of the drink.

Match the amount of fluid to the conditions and to how much you sweat. Do not exceed the serving stated on the label.

Worth knowing

Do I need it for every session?

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

Can I make the drink stronger?

Stick to 40 g per 500 ml. A higher concentration changes the drink and more often upsets the stomach.

How much drink per hour?

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

How many carbohydrates per hour of effort?

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

How do I combine the drink with gels or bars?

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

What is gut training?

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

Can the drink cause stomach problems?

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

What about long races?

Plan fluids and carbohydrates from all products together. Test the strategy in training first.

Based on materials prepared by an Olympic dietitian.
Edited by ATHLECOR.

Sources and how current these instructions are

Tested product batch: AC-3.5A-2602-01.Servings follow the product label and the shop page. If they differ, the label on your pack applies.

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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 document you can open

Batch testing.
A defined scope.

Report by J.S. Hamilton Poland (accredited laboratory, AB 079) no.357252/26/GDY, batchAC-3.5B-2602-01, variant: lemonade. Produced 06.03.2026, best before 06.03.2028.

Report by J.S. Hamilton Poland (accredited laboratory, AB 079) no.357251/26/GDY, batchAC-3.5A-2602-01, variant: forest fruit. Produced 05.03.2026, best before 05.03.2028.

Report by J.S. Hamilton Poland (accredited laboratory, AB 079) no.357253/26/GDY, batchAC-3.5C-2602-01, variant: orange. Produced 06.03.2026, best before 06.03.2028.

What was tested?

Scope: yeasts and moulds, Salmonella, coagulase-positive staphylococci, Escherichia coli, Listeria monocytogenes, and lead, arsenic, cadmium and mercury against Regulation (EU) 2023/915. Metals: within the criterion; micro-organisms below the limits of quantification. The report does not test how well the product works.

What this report does not prove

It is not a study of how well supplementation works, nor an anti-doping certificate. It describes the tested sample from the stated batch.

Thumbnail: page 1 of 2. Compare the batch number with your pack. Tap to open the scan enlarged.

How the formula is built and who decides about it

What customers say

How does it work day to day?

4,8/5 8 ratings, 13 reviews

Reviews in the authors' own wording, written in Polish. The average comes from reviews with a rating. Only reviews linked to an order in the shop carry the „verified purchase” mark.

09.08.2026

Testowałam na długich wybieganiach i naprawdę daje radę. Dla mnie owoce leśne za słodkie, zdecydowanie wolę te cytrusowe.

Aleksandra Szymańska

16.06.2026

Razem z mężem zgodnie twierdzimy że to najlepszy izotonik jaki próbowaliśmy :) polecamy wszystkim znajomym

Julia Kaczmarek

03.06.2026

Lemon jest świetny owoce leśne trochę słodkawe, ale dopracuję ilość w bidonach. Codziennie zresztą na nich robię trening, fajnie, że Izo ma dużo węgli, czuć, że bardzo dobrze nawadnia.

Łukasz Zdanowski

28.05.2026

Znajoma poleciła mi smak owoce leśne i się nie zawiodłam. New fav <3

Martyna B

28.05.2026

owoce lesne najlepsze, 2 torba za mna

Mikołaj K

28.05.2026

normalnie nie lubie pomaranczy ale ta nie jest taka chemiczna tylko przyjemna

robert

Show all reviews (13)

27.05.2026

Smak owoce leśne to jest topka. Jak ktoś nie próbował to polecam

Maciek

21.05.2026

Nie wiem od czego zaczac. Wszystko jest tak jak nalezy; smak sie nie nudzi, nie jest za slodki, za kwasny, za gorzki. W punkt. Wybrałem lemoniadę i się nie zawiodłem.

Hubert

21.05.2026

Normalnie nigdy nie wybieram pomarańczy, ale ta od Athlecor jest zupełnie czyms innym. Smakuje mega; polecam sprobowac <3

Julia Mróz

21.05.2026

Smak owoce leśne co prawda smaczny ale paczka nie zdążyła przyjść przed moim obozem treningowym

Eryk

Na dłuższych treningach na szosie robi robotę. Dobry smak, nie zamula i nie mam po nim problemów z żołądkiem.

Kris

Super izotonik, próbowałem wielu, ale wszystkie miały taki sztuczny posmak, albo były przesłodzone.

Mario

Dobrze siada przed i w trakcie mocnego treningu, nie zalega na żołądku. Minusem jest to, że trzeba pilnować odpowiedniego rozcieńczenia, za mocny robi się dla mnie za słodki.

Klaudia

Good to know before buying

Have a question?

Answers useful before buying and while using the product.

How does an isotonic drink differ from water?

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

How does an isotonic drink differ from an energy drink?

Isotonic is there to make a drink with carbohydrates and electrolytes. Energy drinks often contain caffeine and have a different recipe. Check the specific ingredient list, because not every energy drink has the same properties.More in the guide (in Polish): Woda, izotonik czy napój energetyczny: co pić podczas wysiłku

Which flavour should I pick?

Lemonade is the least sweet, forest fruit the sweetest and least sharp, 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

Does ATHLECOR Isotonic contain caffeine?

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

Is the sugar in an isotonic drink unhealthy?

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

Do isotonic drinks damage teeth?

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

Does it contain sugar?

Yes, 15 g of sugars per serving from fructose and glucose, with the rest of the carbohydrates from maltodextrin. Additionally sweetened with sucralose.

How many servings a day?

The label gives a recommended daily serving of 3 × 40 g, so up to 120 g on days of long efforts.

What does hypotonic mean?

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.

Can I buy a single product?

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.

What sources is this description based on?

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.

More answers:Knowledge base · How the matching works

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

Isotonic

See whether Isotonic fits your training.

40 g per 500 ml. Measured, not declared.

40 g per 500 ml of water

235 mg of sodium per serving

Osmolality 284 mOsm/kg

Before a ride: a scoop into the bottle, 500 ml of water.

Isotonic

Worth knowing

Does this product fit you?

Something unclear?

Check your serving.

Nutrition facts

Batch testing.A defined scope.

What was tested?

What this report does not prove

How does it work day to day?

Have a question?

Batch testing.
A defined scope.