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Isotonic drink: the secret of athletes to push their limits
You sweat, you lose water. With every drop of sweat, a little of your energy evaporates. Most studies show that 2% dehydration causes a performance drop of about 10%, and this is even more true in endurance sports.
In addition to water, which allows the body to function normally and quickly, electrolytes, especially sodium, are lost through perspiration and must be compensated to maintain proper metabolic regulation.
Every drop of sweat makes it difficult for your body to sustain prolonged effort, regulate your temperature, and function quickly and optimally. Uncompensated, it takes you further away from your dream time. Looking for thrills without the fear of hitting the “wall”?
The solution? A perfectly calibrated isotonic drink, by Authentic Nutrition, that gives your body exactly what it expends – no more, no less.
Why choose Authentic Nutrition isotonic drink?
Lightning-fast absorption for immediate energy
An isotonic drink means that its osmotic pressure is identical to that of your blood, allowing for ultra-fast absorption of everything it contains. Result: when your energy drink is isotonic, your blood sugar remains stable, your electrolyte losses are quickly compensated, and your glycogen reserves are preserved for the final sprint.
Precise electrolyte balance
Each serving replaces electrolyte and glycogen losses: sodium, potassium, magnesium, in physiological proportions, as well as zinc and BCAAs. No more cramps and slumps; you’ll maintain a fluid stride until the end of the course.
Natural flavors and calm digestion
100% natural fruit flavors with a slightly sweet taste and a carbohydrate matrix based on maltodextrin and dextrose: zero bloating, zero nausea, even after long hours of effort.
French manufacturing, short supply chains
From the selection of raw materials to packaging, everything is prepared in a French workshop in Rhône-Alpes. You support the local economy and reduce the carbon footprint of your refreshments.
Compare with our energy bars
Integrating our isotonic drinks into your endurance strategy
Before sports effort
It is important to stay well hydrated with water daily, but even more so in the 4 days before effort. For your race, you can do a carbohydrate load in the days leading up to it with Carbo Powder. Whether in training or for a race, in the hour before the start, drink 25 ml of isotonic drink every fifteen minutes to saturate your reserves without disturbing your digestion.
During sports performance
Here are the hydration recommendations depending on the duration of the effort:
- ≤ 1 h: 250 ml every 20 min.
- 1 – 2 h: 500 ml per hour + a bite of an energy bar every 30 minutes.
- > 2 h: supplement with 1 energy gel or Gummies every 45 minutes or before a steep climb.
After effort
It is important to rehydrate after intense effort with a drink containing minerals, carbohydrates, and BCAAs for muscle reconstruction. Reconstitute 500 ml of your favorite Booster + flavor and drink it calmly. You will reduce muscle recovery time by 30% and avoid post-training cravings.
Nutritional compatibility
Combine it with our protein drink and/or a protein bar to speed up recovery and string together efforts (BCAAs + proteins + electrolytes).
FAQ – Your questions, our answers
What is the benefit of an isotonic drink and when should it be consumed?
An isotonic drink compensates in real-time for the double loss of water and electrolytes. Use it in all your endurance sports, especially when your sessions exceed 1.5 hours.
What is an isotonic drink?
- Osmolarity: ~275-295 mOsm/l (identical to plasma).
- Composition: fast carbohydrates + essential electrolytes.
- Function: rapidly transport energy and hydration to active cells.
What is the best isotonic drink?
Criterion Importance Booster + Generic drinks
Stable osmolarity ★★★★★ Yes Variable
Natural origin ★★★★☆ Yes No
Flavor without added sugars ★★★★☆ Yes Rare
Local manufacturing ★★★★☆ France Outside EU
What is the difference between an electrolyte drink and an isotonic drink?
An electrolyte drink primarily provides mineral salts. An isotonic drink adds carbohydrates for immediate energy, useful as soon as an effort exceeds 60 minutes.
When is it recommended to drink an isotonic drink?
- 60 min before a long training session or race.
- Every 15 min during effort.
- Immediately after to speed up fluid regeneration.
How to compensate for mineral salt loss?
- Drink 500 ml of Booster + per hour of activity.
- Test your sweat rate by weighing yourself before/after.
- Add water if the weather is very hot.
What is the scientific evidence and credibility attributed to isotonic hydration?
“A calibrated osmolarity between 270 and 300 mOsm/l optimizes gastric and intestinal flow, decreasing transit time by 17%.” — Journal of Applied Physiology, 2024.
Testimonials from athletes who use our isotonic drinks
“I take it during all my marathon preparations; never any nausea and a strong finish.”
“Slightly sweet taste, very digestible: ideal for my ultra-trails.”
“Ideal for cycling. Good product, good taste, perfectly digestible.”
“My favorite effort drink. Slightly sweet taste and very digestible, ideal for ultra-trails!”
Conclusion
Take action now with our isotonic drinks.
Every kilometer counts. Don't let dehydration break your rhythm: fill your water bottle with Authentic Nutrition isotonic drink and feel the difference from the first sip. Turn every drop of sweat into measurable progress.
Your muscles stay fueled, your mind focused, your time improves session after session.
