Energy Gel
Concentrated carbohydrate supplement in gel form, consumed every 30–45 minutes during endurance events.
Understanding Energy Gel
Energy gels are concentrated carbohydrate supplements in small, single-serve packets designed to be consumed during endurance events. Each gel typically contains 20–30 grams of fast-acting carbohydrates (maltodextrin, fructose, or glucose) that your body can absorb quickly to replace depleting glycogen.
The standard recommendation is one gel every 30–45 minutes during races longer than 60–75 minutes, washed down with water. This provides the 30–60 grams of carbs per hour that research shows is optimal for endurance performance. Some newer gels use dual-carb formulations (glucose + fructose) that allow absorption rates up to 90 grams per hour.
Gels are a love-it-or-hate-it necessity. Some runners find them easy to consume; others struggle with the texture, sweetness, or GI distress. The key is training your gut: practice with your chosen gel brand during long training runs. What works for one runner may not work for another. Popular alternatives include chews, waffles, real food, and liquid calories.
Key Facts: Energy Gel
Key facts and insights about energy gel that every endurance athlete should know.
Typical gel
Typical gel: 20–30g carbs, 80–120 calories in a 1-oz packet
Recommended intake
Recommended intake: one gel every 30–45 minutes during races over 60 minutes
Always take gels with water
Always take gels with water — taking them with sports drink can cause GI issues from sugar overload
Popular brands
Popular brands: GU, Maurten, SiS, Clif, Huma, Spring Energy
Pro Tips: Energy Gel
Practice with your race-day gel brand on long training runs — never try a new gel on race day
Alternate between flavors during long races to prevent palate fatigue
Take gels with water only, not sports drink, to avoid excess sugar and stomach issues
Tear the packet partially before the race and tuck it in your waistband for easy access
Frequently Asked Questions About Energy Gel
Common causes: taking gels with sports drink (double carb dose), consuming too much at once, dehydration (concentrated sugar without enough water), or the specific ingredients. Try different brands, always take with water, and train your gut during long runs. Some runners tolerate real-food alternatives better.
If you'll finish in under 90 minutes, probably not — water and maybe sports drink are sufficient. If you'll be running 90+ minutes, one gel around mile 7–8 can help. For marathons and longer, gels become essential for preventing the bonk.
Related Nutrition & Fueling Terms
View all in Nutrition & FuelingBonk (Hitting the Wall)
Sudden energy depletion when glycogen stores run out, usually around mile 18–20 of a marathon.
Carb Loading
Eating extra carbohydrates 2–3 days before a long race to maximize glycogen stores.
Electrolytes
Minerals (sodium, potassium, magnesium) lost through sweat that must be replaced to prevent cramping.
Gut Training
Practicing race-day nutrition during training runs so the stomach can tolerate fuel under exertion.
Sodium Loading
Deliberately increasing sodium intake in the 24–48 hours before a hot-weather race to expand plasma volume and improve heat tolerance.
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