Nutrition
Isotonic Drink Mix
An isotonic drink mix balances carbs and sodium for absorption during effort—concentration trained in practice, not changed on race morning.
An isotonic drink mix matches fluid osmolality to gut absorption during effort—typically six to eight percent carbohydrate with sodium so bottles deliver carbs and electrolytes together. Hypertonic syrups bloat; hypotonic mixes under-fuel.
Concentration changes with heat and bottle size. Train the exact scoop count you will carry.
Common questions
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Can you rely on drink mix alone for marathon carbs?
Some athletes can if concentration and gut training support hourly targets; others need gels. Test total grams per hour on long efforts, not at the expo.
Related terms
Put Isotonic Drink Mix into practice
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