Preparing for a half marathon is not just about logging miles or improving pace. Nutrition and supplementation play a key role in reaching the 21-kilometer mark while maintaining performance, delaying fatigue, and avoiding a sudden energy crash.
Half marathon supplements help to optimize carbohydrate availability, improve hydration, and use ergogenic aids like caffeine to sustain race pace.
Understanding what to take, when to take it, and how much can make the difference between achieving your goal and suffering in the final kilometers.
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What your body needs for a half marathon
The half marathon is a demanding enough distance to require a specific nutritional strategy.
Although it doesn't reach the duration of a marathon, the 21 kilometers generate a significant demand for glycogen, fluids, and electrolytes.
Therefore, knowing which half marathon supplements you need based on your pace and experience is key to optimizing performance.
Energy demands of 21k
During a half marathon, the body primarily uses carbohydrates as a quick energy source.
Depending on the pace, the duration is usually between 1 hour 10 minutes and 2 hours 15 minutes, which implies a progressive reduction of muscle glycogen reserves.
In this context, half marathon supplements focused on carbohydrate intake help maintain pace and delay fatigue in the second half of the race.
Why nutrition changes with distance
The nutritional strategy is not the same for a 10k as for a half marathon.
For efforts longer than 75–90 minutes, the need for in-race energy intake increases significantly.
Therefore, how to prepare for a half marathon also involves training your nutrition and practicing aid stations during long runs.
The essential supplements for running a half marathon
When we talk about essential supplements for a half marathon, there are three fundamental pillars:
- Energy
- Hydration
- Ergogenic aids
Each of them fulfills a specific function during the race.
Energy gels: when and how many to take
Energy gels are probably the most important supplement within a sports supplement strategy for a half marathon.
Their function is to maintain carbohydrate intake during the race, especially after 40–50 minutes.
As a general reference:
- less than 1 h 30 → 1 gel
- 1 h 30–2 h → 1–2 gels
- more than 2 h → 2 gels
The ideal is to start intake before noticing fatigue.
Among half marathon supplements, this is usually the main tool for sustaining performance.
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Hydration and half marathon supplements
Hydration and half marathon supplements are another of the most determining factors.
In addition to water, consider:
- sodium
- electrolytes
- isotonic drink
Especially in hot conditions or for runners with high sweat rates.
A poor hydration strategy can lead to loss of pace, increased perceived effort, and a higher risk of cramps.
Therefore, among half marathon supplements, hydration should play a priority role.
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Caffeine as a performance tool
Caffeine is one of the most scientifically backed supplements for improving endurance performance.
Used correctly, it can help to:
- Reduce perceived effort
- Improve concentration
- Sustain intensity
In a half marathon, it is usually used 10–45 minutes before the start or in gel format during the middle of the half marathon.
Supplementation strategy according to your pace and goal
The strategy must be adapted to the estimated race time. Not all runners need the same protocol.
That's why we created the half marathon pack, which adapts nutrition, intake, and timing based on how long you take.
Discover it here:
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For runners under 1 h 45 min
In this profile, the pace is usually high, and glycogen consumption is greater.
The strategy can be structured as follows:
- 1 gel before starting (optional)
- 1 gel at km 8–10
- light hydration at aid stations
Here, half marathon supplements primarily focus on carbohydrates, with hydration being less critical.
For runners between 1 h 45 min and 2 h 15 min
In this range, the strategy usually requires greater energy support.
For example:
- 1 gel at km 6–8
- 1 gel at km 14–16
- isotonic drink or salts
This profile usually benefits greatly from a better planned strategy of supplements for a half marathon.
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Fanté sports supplements for half marathons: choose based on your needs
Among the supplements for running a half marathon, the choice must adapt to your target time, digestive tolerance, and race strategy.
Fanté offers different options to cover energy and hydration.
Gel 60: maximum energy with 1:0.8 ratio and digestive tolerance
The Gel 60 is designed to provide a high amount of carbohydrates per unit.
Its maltodextrin : fructose 1:0.8 ratio promotes efficient absorption and good digestive tolerance.
It is an excellent option among half marathon supplements for high paces or times close to 2 hours.
Gel Lite 30 or Gel Hydro 35 or Gel Hydro 45: the light option for 21k
The Gel Lite 30 fits very well into lighter strategies.
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Especially useful for:
- Fast runners
- First half marathon
- Users with lower digestive tolerance
Among the essential supplements for running a half marathon, it is a very versatile alternative.
ISO Drink: complete hydration before and during the race
Complete hydration before and during the race is essential to maintain performance.
Isotonic solutions help to:
- Provide sodium
- Maintain fluids
- Sustain energy
Hydration and half marathon supplements should be trained just like pace.
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How to prepare for a half marathon also means preparing your nutrition
Nutritional preparation should be rehearsed during long runs.
Therefore, how to prepare for a half marathon also involves testing gels, hydration, and timing before race day.
It is never advisable to improvise when implementing sports supplements in your half marathon strategy on event day.
Bibliography
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- Cermak NM, van Loon LJC. The use of carbohydrates during exercise as an ergogenic aid. Sports Med.2013;43(11):1139-1155. PMID: 23846824.
- Stellingwerff T, Cox GR. Carbohydrate supplementation on exercise performance or capacity of varying durations: a systematic review. Appl Physiol Nutr Metab. 2014;39(9):998-1011. PMID: 24951297.
- Jeukendrup AE. Carbohydrate intake during exercise and performance. Nutrition. 2004;20(7-8):669-677. PMID: 15212750.
- Rowlands DS, Houltham S, Musa-Veloso K, Brown F, Paulionis L, Bailey D. Fructose-Glucose Composite Carbohydrates and Endurance Performance: Critical Review and Future Perspectives. Sports Med.2015;45(11):1561-1576. PMID: 26373645.
