For the better part of three decades, the energy gel dominated endurance sport. Compact, portable, and precisely dosed, gels became the default fueling solution for runners and triathletes worldwide. But a growing body of research, and a growing number of athletes comparing results in training, is shifting the conversation toward carbohydrate drink mixes as the primary in-race fueling vehicle.
This is not a preference argument. There are meaningful physiological and practical differences between these two delivery systems that directly affect your performance, your gut, and your logistics on race day.
What Both Are Trying to Solve
Both gels and carbohydrate drink mixes aim to deliver exogenous (externally sourced) carbohydrates to working muscles during sustained exercise, when stored glycogen is being depleted.
The differences lie in how carbohydrates are delivered and absorbed, what else they deliver alongside carbohydrates (primarily electrolytes and fluid), how the gut responds to each under race conditions, and practical logistics during competition.
The Case for Energy Gels
Portability and precision
Gels are genuinely portable. A sachet fits in a jersey pocket, a race suit, or a trail vest without meaningfully affecting weight or aerodynamics. They come in precise doses (typically 20 to 25 grams of carbohydrate per sachet), making carbohydrate tracking straightforward.
Established research base
The evidence base for gel-based carbohydrate supplementation during endurance exercise is extensive. Gels have been shown to improve performance in events lasting over 60 minutes across dozens of randomised controlled trials (Jeukendrup, 2004).
Where Gels Fall Short
They require additional water, with timing that has to be precise
Most energy gels are hypertonic solutions, meaning they have a higher osmolality than blood plasma. When a hypertonic solution arrives in the intestine without adequate fluid, it draws water from the bloodstream into the gut to dilute itself to an absorbable concentration. The result: temporary worsening of dehydration, bloating, GI discomfort, and slowed carbohydrate absorption. Gels need to be chased with approximately 150 to 200 millilitres of water to absorb effectively.
Single-carbohydrate absorption ceiling
Most energy gels use glucose or maltodextrin as their sole carbohydrate source. The intestinal transporter responsible for these (SGLT1) saturates at approximately 60 grams per hour. Consuming more gel beyond this point does not increase absorption. The excess accumulates in the gut. Athletes targeting 90 grams or more per hour cannot meet this target using single-carbohydrate gels without significant GI distress. The mechanism is laid out in detail in our dual-carb science article.
GI distress is the most common non-fitness cause of underperformance
A 2011 survey of Ironman athletes found that over 90 percent experienced GI symptoms during racing, with 32 percent reporting symptoms severe enough to affect performance (de Oliveira et al., 2011). Gels, particularly single-carb gels at high doses, are a well-established contributing factor.
They do not solve the hydration equation
A gel sachet contains virtually no water and minimal electrolytes. If gels are your primary carbohydrate source, you still need a separate hydration and electrolyte strategy. This means more products, more timing decisions, and more logistics mid-race. For sodium specifically, see how much sodium endurance athletes need.
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The Case for Carbohydrate Drink Mixes
Hydration, electrolytes, and carbohydrates integrated in one solution
A carbohydrate drink mix delivers carbohydrates, electrolytes, and fluid simultaneously. This eliminates the gel-plus-water timing problem. The carbohydrates arrive in the intestine already diluted to isotonic concentration, ready for absorption without first drawing fluid from the bloodstream.
The practical result: one sip from one bottle addresses hydration, electrolytes, and carbohydrate in a single action. Fewer products, fewer decisions, fewer things to get wrong under fatigue.
Isotonic delivery means faster absorption
At recommended mixing concentrations, a quality carbohydrate drink mix sits in the isotonic osmolality range (roughly 270 to 330 mOsm/kg). This is the zone where gastric emptying is fastest. Research comparing isotonic drink mixes to gels found comparable, and in some conditions superior, carbohydrate delivery rates for isotonic drinks when matched on total carbohydrate dose (Shi et al., 2000).
Dual-carb formulation unlocks higher absorption rates
The best carbohydrate drink mixes use a 2:1 maltodextrin-to-fructose ratio, enabling up to 90 grams of carbohydrate absorption per hour by using two independent intestinal transporters simultaneously. This is well above the 60-gram ceiling of single-carb gels.
Better palatability over long events
As races extend beyond two to three hours, many athletes find that the concentrated sweetness of gels becomes overwhelming. The ability to sip progressively from a bottle better matches how appetite and palatability change over the course of long events.
Side-by-Side Comparison
| Factor | Energy Gels | Carb Drink Mix |
|---|---|---|
| Carbohydrate absorption ceiling | ~60g per hour (single-carb) | 90 to 120g per hour (dual-carb) |
| Osmolality on ingestion | Hypertonic (requires water) | Isotonic at recommended mix |
| Electrolyte replacement | Minimal to none | High-sodium electrolytes |
| Fluid delivery | None (requires separate water) | Integrated |
| GI distress risk | Moderate to high at high doses | Lower with isotonic, dual-carb formula |
| Palatability over 3-plus hours | Declines with sweetness fatigue | Generally maintains |
| Race logistics | Multiple packets, strict timing, disposal | Single bottle management |
| Best for | Short events, supplement use | Events 60 minutes and beyond |
When Gels Still Make Sense
- Short events (under 60 minutes): one or two gels provide a simple, portable carbohydrate hit
- Events where carrying a bottle is impractical
- As a complement to a drink mix, for an acute timed carbohydrate bolus at a specific race moment
- Individual gut preference: if gels work for you with no GI distress, that is a valid outcome
For the wider quality checklist on what a fuel needs to deliver in either format, see five things your endurance fuel must have.
Before the Race: The Window Neither Format Covers on Its Own
Both gels and drink mixes are designed for during-session use. The pre-session window is a different requirement that most athletes leave completely unaddressed.
Hard sessions begin with a depletion clock already running. Glycogen was being used during sleep. Plasma volume is at its lowest point of the day. Starting a hard effort from this baseline means the first 20 minutes are spent catching up rather than performing.
HYDRAX PRIMER addresses the pre-session window specifically. Taken 25 to 40 minutes before a hard session or race, PRIMER delivers 29 grams of dual-carb fuel and 1,313 milligrams of sodium, expanding plasma volume and topping up glycogen before the effort begins. Then HYDRAX CORE takes over during the session. PRIMER before. CORE during.
HYDRAX CORE and HYDRAX PRIMER — Order now, ships Australia-wide.
Frequently Asked Questions
Can I use HYDRAX CORE alongside gels, or is it one or the other?
Both. Many athletes use HYDRAX CORE as their baseline fuel (ongoing sipping from a bottle) and use a gel for a timed carbohydrate bolus at a specific race moment. The dual-carb drink mix handles steady-state fueling; the gel provides an acute spike where needed.
Is it harder to hit 90 grams per hour with a drink mix than with gels?
In practice, it is easier. With gels, you need to take one 25-gram gel every 16 to 17 minutes and chase each with water, a strict schedule under race conditions. With HYDRAX CORE, you sip from a bottle every 10 to 15 minutes. The pace naturally delivers carbohydrates at the target rate.
What about solid food in very long events?
Solid food plays a useful role in events lasting four or more hours, where gut fatigue with liquid fuels develops. For events under four hours, HYDRAX CORE as the primary fuel vehicle is practical and sufficient.
References
Jeukendrup AE (2004). Current Sports Medicine Reports. | de Oliveira EP et al. (2011). Journal of the International Society of Sports Nutrition. | Shi X et al. (2000). Medicine and Science in Sports and Exercise.