By Ethan BrooksGU energy chews vs gels is one of the most common fueling decisions marathoners face, and the right answer depends on how your stomach handles fast-acting carbohydrate, how you carry your fuel, and when you plan to take it. By the end of this guide, you will know how the two formats differ in carbohydrate delivery, texture, and practicality, and you will have a simple way to test each one during training before race day.
How GU Energy Chews and Gels Differ
Both products are built to deliver quick carbohydrate during exercise, typically in the range of roughly 20 to 25 grams per serving for most GU products. Both are designed to be taken with water. The real differences come down to texture, portability, how quickly you can consume them, and how they sit in your stomach while you are running.
A gel is a semi-liquid pouch you tear open and squeeze. A chew is a small, soft, gummy-style piece you bite and swallow. Because chews are solid, you need to chew and swallow them with some saliva, which takes a bit more effort than squeezing a gel. Gels, by contrast, go down quickly and can be consumed in a few seconds.
Step 1: Compare the Carbohydrate and Caffeine Content
Start by reading the label. Carbohydrate content and caffeine vary by flavor and by product line, so compare the exact item you plan to use rather than assuming all GU products match. Check whether the product you are considering includes caffeine, and note the amount per serving. Caffeine can help some runners feel more alert late in a race, but it can also cause jitteriness or stomach upset if you are not used to it.
If you are planning a caffeine strategy, decide ahead of time whether you want it in the early miles, the late miles, or not at all. Do not experiment with caffeine for the first time on race day.
Step 2: Test Each Format on Your Long Runs
The most useful test is the one you run yourself. Over several long runs, try each format at the same point in the run and track how you feel. Pay attention to these factors:
- Stomach comfort 10 to 20 minutes after eating
- Ease of consumption while your breathing is elevated
- Whether you need water to wash it down
- Taste fatigue after several servings
- Energy level 20 to 30 minutes later
Many runners find gels easier to take at faster paces because they require less chewing. Others find chews more pleasant on long, steady efforts because they feel less sticky and are easier to portion across a longer run.
Step 3: Consider Your Carrying and Storage Setup
Practical logistics matter a great deal. Gels come in small pouches that fit easily into a running belt, shorts pocket, or hydration vest. Chews often come in a small resealable pack that is easy to store, but they can crumble or stick together in hot weather. Gels can leak if they are not sealed well or if they are stored in a pocket where they get compressed.
Before race day, practice carrying your chosen format in the same pocket or belt you will use in the race. Make sure you can reach it without stopping.
Tools and Supplies to Prepare
- Enough fuel for your race plus one or two backup servings
- A running belt or pocket that keeps the fuel secure and reachable
- A small notebook or app for logging your test-run results
- Water or an electrolyte drink for the planned intake points
Step 4: Plan Your Intake Schedule
Once you know which format works, build a schedule. Many marathon plans suggest starting fuel roughly 45 to 60 minutes into the race and repeating every 30 to 45 minutes, though the right interval depends on your pace, body size, and experience. Write down the mile markers or time points where you will take each serving so you are not making decisions while you are tired.
Sample Comparison Table
| Factor | GU Energy Gels | GU Energy Chews |
|---|---|---|
| Texture | Semi-liquid, squeezed from pouch | Soft, chewed and swallowed |
| Water needed | Usually recommended | Usually recommended |
| Speed of intake | Very quick | Slower, requires chewing |
| Portability | Compact pouch, can leak if pressed | Small pack, can stick in heat |
| Best suited to | Faster efforts, quick intake | Steady efforts, spreading intake |
Common Mistakes
- Trying a new format for the first time on race day.
- Taking fuel too late, after you already feel depleted.
- Skipping water with gels or chews, which can cause stomach discomfort.
- Carrying fuel in a pocket you cannot reach while running.
- Ignoring expiration dates. Check the packaging and replace anything expired or damaged.
- Stacking too many servings at once to make up for missed intake.
Tips for Choosing Between Them
If you have a sensitive stomach, test both formats thoroughly before deciding. If you run at a fast pace and want the quickest possible intake, gels often fit better. If you prefer a slower, more relaxed approach and don’t mind chewing, chews can work well. Many runners use a mix, carrying gels for the closing miles and chews earlier in the race, so the combination is worth trying in training.
For more context on timing and format choices, you may find Energy Chews vs Gels (2026): Which Is Better for Marathon Fueling? useful, along with When to Take Energy Gels: A Marathoner's Timing Guide and How Many Energy Gels for Half Marathon Runners Need: A Step-by-Step Plan.
If you have a medical condition, are pregnant, or are unsure how caffeine or carbohydrate intake will affect you, consult a doctor or a registered dietitian before changing your race fueling plan.
Recommended gear
- Running belt with multiple pockets: Keeps gels and chews reachable without bouncing, which reduces the risk of crushed packs. View on Amazon
- Soft flask for water: Makes it easy to wash down fuel at aid stations or on your own during training. View on Amazon
- Hydration vest with front pockets: Useful for longer training runs where you carry several servings and extra water. View on Amazon
FAQ
Are GU energy chews better than gels for marathons?
Neither is universally better. Gels are faster to consume, while chews are easier to spread out over a longer period. The best choice is the one your stomach tolerates well and that fits your pace and carrying setup.
Do I need water with GU chews or gels?
Product guidance usually recommends taking them with water. Drinking water helps move the carbohydrate through your digestive system and reduces the chance of stomach discomfort, especially at faster efforts.
How many carbs should I take per hour while running?
Many marathon fueling plans aim for roughly 30 to 60 grams of carbohydrate per hour, depending on pace, body size, and experience. Your exact target should be tested in training. A registered dietitian or sports nutrition professional can help you personalize it.
Can I mix chews and gels in the same race?
Yes, and many runners do. A common approach is to use one format early and the other later, or to alternate them. Test the combination during long training runs before using it on race day.
Do GU products contain caffeine?
Some GU products contain caffeine and others do not. Check the label of the exact product and flavor you plan to use, and avoid trying caffeinated fuel for the first time on race day.
What if my stomach gets upset when I take gels or chews?
Reduce the amount you take at one time, drink water with each serving, and try spacing intake further apart. If symptoms persist or are severe, stop experimenting with that product and consult a doctor or sports dietitian.
How long do GU products last?
Shelf life depends on the product and storage conditions. Check the expiration date printed on the packaging and discard anything expired, damaged, or unusually textured. Store fuel in a cool, dry place away from direct heat.
Should I take fuel before the race starts?
Many runners take a pre-race carbohydrate meal in the hours before the start and reserve gels or chews for mid-race. Whether you also take a serving right before the gun should be tested in training, since some people find it helpful and others do not.
Conclusion
Choosing between GU energy chews and gels comes down to how your body responds, how you like to eat during effort, and how you plan to carry your fuel. Test both formats on your long runs, track how you feel, and build a written intake schedule. With a tested plan, you will walk into race day knowing exactly what to take and when.
Ready to choose one?
About Ethan Brooks
Ethan Brooks is part of our editorial team and reviews and edits our marathon & half-marathon guides, checking product details against manufacturer specifications and owner feedback.
