Behind every drink lies a process of experimentation: measuring proportions, testing flavours, adjusting minerals… All with one goal: to create a product that precisely meets the body’s needs. This process brings the isotonic drink to life, a scientifically designed blend to optimise recovery and performance.
If you are considering developing this type of drink for your business, at Cosmos Aromática you will find an expert team with decades of experience designing and manufacturing solutions for the food sector.
Let’s explore what an isotonic drink is, how it is formulated, and how it can drive the success of your business.
What is an isotonic drink and what is it for?
From a food technology perspective, an isotonic drink is a sports beverage formulated with a solute concentration (mainly sugars and mineral salts) similar to that of body fluids, allowing rapid and efficient gastric emptying and absorption.
Functional objectives of an isotonic drink
A well-designed isotonic drink pursues three fundamental objectives:
- Effective rehydration: water and electrolytes compensate for losses through sweat during prolonged or intense exercise, helping to maintain plasma volume and thermoregulation.
- Replenishment of key electrolytes: particularly sodium, and to a lesser extent potassium, calcium, and magnesium, which are involved in muscle contraction, nerve transmission, and intra- and extracellular fluid balance.
- Rapidly available energy supply: high-glycaemic carbohydrates (glucose, sucrose, maltodextrins) support performance during endurance exercise by maintaining blood glucose levels and glycogen reserves.
Composition of isotonic drinks
From a product design perspective, an isotonic drink is much more than water with sugar and salt. Its performance depends on the precise adjustment of each component and their interactions.
Water: the basis of hydration
Water usually represents more than 85–90% of the total volume. Its main functions are:
- It serves as the vehicle for transporting carbohydrates and electrolytes.
- It participates in controlling body temperature through sweating.
- It influences mouthfeel and the perception of sweetness and acidity.
Electrolytes: sodium, potassium, calcium and magnesium
Electrolytes are central to the functionality of an isotonic drink. The most important include:
Sodium (Na⁺)
- Replenishes losses through sweat.
- Helps maintain extracellular fluid volume.
- Stimulates thirst and promotes fluid retention.
Potassium (K⁺)
- Contributes to acid–base balance.
- Helps restore intracellular fluid balance after exercise.
- Participates in neuromuscular excitability.
Calcium (Ca²⁺) and magnesium (Mg²⁺)
- Calcium is involved in muscle contraction and nerve impulse transmission.
- Magnesium participates in numerous enzymatic reactions related to energy metabolism and muscle function.
Carbohydrates: the energy driver of the isotonic drink
According to European recommendations and scientific societies, sports drinks should:
- Provide between 80 and 350 kcal/L.
- Obtain at least 75% of this energy from rapidly available carbohydrates.
- Remain below 90 g/L of total carbohydrates to ensure good gastric tolerance.
The most commonly used are:
- Glucose and glucose polymers (maltodextrins): improve energy supply without excessively raising osmolality.
- Sucrose, fructose, or other sugars: allow modulation of sweetness and the energy release curve.
Other components: vitamins, amino acids and natural flavourings
An isotonic drink can also incorporate additional elements that add value:
Water-soluble vitamins (C and B complex)
- Reinforce functional positioning.
- Allow claims related to energy metabolism or fatigue reduction (if dosage requirements under EU legislation are met).
Amino acids and peptides
- Certain amino acids (e.g., glycine, alanine, glutamine) have been studied for their possible role in water absorption or muscle recovery.
- In advanced formulations, they can complement carbohydrates to support post-exercise recovery.
Bioactive components and botanical extracts
- Extracts rich in polyphenols, citrus, tea, or aromatic plants can reinforce the “functional hydration” narrative and the “natural origin ingredients” concept, always within EU regulatory limits.
Flavour and colour systems
- Natural or naturally derived flavours (e.g., citrus, red fruits, tropical fruits) define the sensory personality of the isotonic drink.
- Colour should enhance flavour expectations without affecting the perception of naturalness sought by many consumers today.
How should isotonic drinks be consumed?
Their proper use is linked to hydration and energy needs during physical activity. Sports drinks are mainly recommended for:
- Intense or prolonged exercise, lasting more than 60 minutes.
- Training sessions or competitions in hot or humid conditions.
- Endurance sports (running, cycling, triathlon, team sports…) with high sweat loss.
For moderate activities lasting less than an hour, water is usually sufficient, and continuous consumption of isotonic drinks outside a sporting context may be nutritionally less relevant due to their added sugar content.
The isotonic drink market
Globally, market reports agree that isotonic drinks benefit from a clear trend: consumers are increasingly concerned with health, physical activity, and hydration, seeking products that offer genuine functionality, not just flavour.
In Spain, the combined market for energy and sports drinks shows sustained growth, with projected value increases from around USD 2,777 million in 2024 to approximately USD 3,414 million by 2030.
For a beverage manufacturer, this means that the category is no longer limited to professional athletes:
- It reaches consumers who engage in recreational sports.
- It connects with very diverse profiles (cyclists, amateur runners, gym-goers, workers performing physical labour).
- It intersects with other trends such as “low sugar”, “clean label”, and natural-origin ingredients.
Key trends affecting isotonic drinks
When designing a new range of isotonic drinks, it is important to consider certain formulation and positioning trends:
Sugar reduction and smart reformulation
- The challenge is to maintain functionality (carbohydrate supply) and pleasant flavour with less sugar.
- Combining different sugars, maltodextrins, and, if aligned with the brand strategy, high-intensity sweeteners allows adjustment of the caloric profile without compromising palatability.
Natural ingredients and clean labelling
- Demand is increasing for natural flavours, natural colourings, and botanical extracts recognisable to consumers (citrus, berries, tea, aromatic herbs).
- The isotonic drink evolves from being a simple “replacement liquid” to a functional hydration product with a narrative of naturalness.
Segmentation by use and consumption occasion
- Formulations designed specifically for consumption during exercise.
- “Ready-to-drink” versions versus powders for dilution.
- Sugar-free options aimed at consumers seeking flavour, electrolytes, and hydration sensation without high energy content.
Innovation in flavour and sensory experience
- Citrus, tropical, or forest fruit profiles remain standard references, but there is space for more complex flavours: fruit combinations with subtle botanical notes that differentiate the brand without overwhelming the consumer.
Flavour, science and performance
For innovation managers in the beverage industry, mastering the formulation of the isotonic drink and its positioning opens the door to a growing category with increasingly informed consumers.
At Cosmos Aromática, we collaborate with manufacturers who want to go a step further in these developments: designing customised flavours, emulsion systems for functional drinks, and solutions based on botanical extracts and distillates that give each product its own unique character. If your team is working on a new isotonic drink or wishes to reformulate an existing range, we can help.
We invite you to contact us to discuss your project, explore new flavour combinations, and develop the next generation of isotonic drinks together.