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Energy gels have become an essential part of every distance runner's toolkit. Whether you are training for a 10K, a half marathon, or a full marathon, having the right fuel can mean the difference between a personal best and hitting the wall at kilometer 30 (World Athletics) (ACSM).
In 2026 the market offers more variety than ever: hydrogel technology, isotonic formulas, natural ingredients, and ultra-high carbohydrate loads. We have analyzed the 10 best energy gels available to help you choose the one that fits your stomach, your distance, and your performance goals.
Contents
How energy gels work
Three key factors define a great energy gel for runners:
- Carbohydrate source: The primary fuel in any gel. Most use maltodextrin, fructose, or a blend of both. The ratio matters: a 2:1 maltodextrin-to-fructose ratio allows your body to absorb up to 90g of carbs per hour, compared to 60g from a single source.
- Consistency and osmolality: Standard gels are thick and concentrated, requiring water to digest. Isotonic gels are pre-diluted to match your blood's concentration, making them easier on the stomach but larger to carry.
- Extras: Caffeine, electrolytes (sodium, potassium), BCAAs, and vitamins. Caffeine-enhanced gels can provide a mental and physical boost, especially in the later stages of a race. Electrolytes help prevent cramping.
The 10 best energy gels for running
1. Maurten Gel 100 — Most innovative (hydrogel)
~3.50€/gelBest for: marathon, half marathon, sensitive stomachs
- ✓ Revolutionary hydrogel technology for easy digestion
- ✓ No artificial flavors, colors, or preservatives
- ✓ Used by elite marathon runners worldwide
- ✗ Premium price (~3.50€ per gel)
- ✗ Bland taste, not for everyone
- ✗ Only one flavor available
Maurten changed the gel game with its patented hydrogel technology. The gel encapsulates carbohydrates in a hydrogel matrix that passes through the stomach quickly and releases energy in the intestine, drastically reducing the risk of GI distress. This is the gel that fueled Kipchoge's sub-2-hour marathon.
The taste is intentionally neutral: no sweetness, no artificial flavors, just pure fuel. Some runners love the simplicity, others find it unpleasant. At 25g of carbs per gel with virtually zero stomach issues, the Maurten Gel 100 is the gold standard for marathon nutrition. The Gel 100 CAF version adds 100mg of caffeine for the late stages of a race.
2. SiS GO Isotonic Gel — Best isotonic
~1.50€/gelBest for: runners who hate drinking water with gels, all distances
- ✓ Truly isotonic: no water needed
- ✓ Great value for money
- ✓ Wide range of flavors
- ✗ Larger packet (60g vs 40g standard)
- ✗ Slightly fewer carbs per serving (22g)
- ✗ Can be messy to open while running
Science in Sport (SiS) pioneered the isotonic gel concept. Unlike standard gels that sit heavy in your stomach until you wash them down with water, the SiS GO Isotonic Gel has the same osmolality as your body fluids, meaning it absorbs quickly without any extra water.
This is a game changer for races where aid stations are sparse or when you simply do not want to deal with water timing. The trade-off is a larger packet size and slightly fewer carbs per gel. At around 1.50 euros per gel, the SiS GO is also the best value on this list. Available in multiple flavors including citrus, apple, and tropical.
3. GU Energy Gel — Most popular
~2.00€/gelBest for: all distances, widest flavor selection, proven reliability
- ✓ Over 15 flavor options including caffeinated versions
- ✓ Compact, easy-to-carry packet
- ✓ Includes amino acids and electrolytes
- ✗ Requires water for proper absorption
- ✗ Thick consistency not for everyone
- ✗ Some flavors overly sweet
GU is the world's best-selling energy gel for a reason. It has been fueling runners since 1993 and the formula has been refined over three decades. Each gel packs 100 calories with a blend of maltodextrin and fructose, plus branched-chain amino acids to reduce muscle damage during long efforts.
The biggest advantage is variety: over 15 flavors ranging from Salted Caramel to Jet Blackberry, with caffeine options from 0 to 40mg. The compact 32g packet fits easily in any running belt or pocket. You need water with GU gels, so plan your intake around aid stations. If you are new to gels, GU is the safest starting point.
4. PowerBar PowerGel — Classic reliable
~2.20€/gelBest for: marathon, long runs, runners who want maximum carbs per serving
- ✓ High carbohydrate content (27g per gel)
- ✓ C2MAX dual-source carb formula
- ✓ Decades of proven performance
- ✗ Requires water
- ✗ Very thick consistency
- ✗ Fewer flavor options than GU
PowerBar has been in the sports nutrition game since the 1980s, and the PowerGel is their flagship running product. At 27g of carbs per gel using their C2MAX dual-source formula (maltodextrin + fructose in a 2:1 ratio), it delivers more energy per serving than most competitors.
The consistency is thick, which some runners love for its satisfying texture and others find hard to swallow mid-race. The sodium content is generous, helping with electrolyte replacement during long efforts. The caffeinated versions pack 50mg, a solid boost for the final stretch. A proven, no-nonsense gel for serious runners.
5. Clif Shot Energy Gel — Most natural
~1.80€/gelBest for: runners who prefer organic and natural ingredients
- ✓ 90% organic ingredients
- ✓ Litter Leash packaging for easy carrying
- ✓ Smooth, easy-to-swallow texture
- ✗ Lower caffeine content (25mg max)
- ✗ Requires water
- ✗ Slightly less carbs than PowerBar
Clif stands out in the gel market by using 90% organic ingredients. If you care about what goes into your body as much as how fast it goes, the Clif Shot is your gel. The energy comes from organic maltodextrin and natural fruit flavors, without artificial colors or preservatives.
The patented Litter Leash tab stays attached to the packet after you tear it open, so you do not drop trash on the course. The texture is smoother and more liquid than GU or PowerBar, making it easier to consume at race pace. Caffeine content is modest (25mg in the caffeinated versions) using green tea extract. A responsible choice that still delivers solid performance.
6. Enervit Isotonic Gel — Best Italian
~2.50€/gelBest for: sensitive stomachs, isotonic without the SiS price
- ✓ Isotonic formula, no water needed
- ✓ Italian sports science heritage
- ✓ Added vitamins B1, B2, and B6
- ✗ Lower calorie content (80 kcal)
- ✗ Larger packet size
- ✗ Limited availability outside Europe
Enervit has been the nutrition partner of Italian cycling and running teams for decades, and their isotonic gel brings that expertise to recreational athletes. Like SiS, it is a true isotonic gel that does not require water, making fueling simpler during races.
The addition of B vitamins supports energy metabolism during prolonged exercise. At 20g of carbs per gel it is slightly lower than competitors, which actually makes it gentler on the stomach for runners who struggle with higher doses. The flavors are refined and not overly sweet. Popular in Europe and gaining traction worldwide.
7. High5 Energy Gel — Best value
~1.20€/gelBest for: budget-conscious runners, high-volume training
- ✓ Excellent price per gel (~1.20€)
- ✓ Light, fruity, easy-to-consume texture
- ✓ Real fruit juice in formula
- ✗ Less known brand than GU or Maurten
- ✗ Requires water
- ✗ Simpler formula, no amino acids
High5 is a British sports nutrition brand that offers excellent performance at a fraction of the price of premium gels. At around 1.20 euros per gel, you can stock up for an entire training cycle without breaking the bank.
The formula uses real fruit juice for natural flavoring, resulting in a lighter, more palatable taste than many competitors. The texture is less viscous than GU or PowerBar, closer to a thick juice. With 23g of carbs per gel and caffeine options available at 30mg, High5 delivers solid performance. If you are going through 5-7 gels per long run during marathon training, the savings add up quickly.
8. Victory Endurance Energy Up — Best Spanish
~1.60€/gelBest for: runners in Spain, great local option, good carb content
- ✓ High carb content (26g) at a low price
- ✓ Widely available in Spanish running stores
- ✓ Added electrolytes and potassium
- ✗ Less known internationally
- ✗ Requires water
- ✗ No caffeine version available
Victory Endurance is a Spanish sports nutrition brand that punches well above its weight. The Energy Up gel delivers 26g of carbs per serving using a dual-source formula, placing it among the highest carb-per-gel options alongside PowerBar, but at a significantly lower price.
The formula includes added potassium and sodium for electrolyte support. Flavors include lemon, orange, and red fruits. It is the go-to gel at most Spanish running events and you will find it in virtually every running store in Spain. If you train and race in Spain, the Victory Endurance Energy Up is the smart local choice with performance that matches the international brands.
9. Isostar Energy Gel — Most accessible
~1.50€/gelBest for: beginners, available everywhere, supermarket-friendly
- ✓ Available in supermarkets and pharmacies
- ✓ Good carb-to-weight ratio
- ✓ Affordable and easy to find
- ✗ Basic formula, fewer extras
- ✗ Requires water
- ✗ Limited flavor selection
Isostar is the brand you can find in almost any supermarket across Europe. While it may lack the prestige of Maurten or the cult following of GU, the Isostar Energy Gel is a perfectly solid option that delivers 24g of carbs in a compact 35g packet.
The biggest advantage is accessibility: you can pick up gels the day before a race at a Carrefour or Decathlon without needing to order online and wait for shipping. The formula is straightforward with no unnecessary extras, which some runners actually prefer. For beginners taking their first steps into race nutrition, Isostar is a low-risk, low-cost entry point. Try it, and if you want more, upgrade later.
10. Crown Sport HyperGel 45 — Highest carb load (45g)
~2.80€/gelBest for: ultra-marathon, high carb needs, fewer gels per race
- ✓ Massive 45g of carbs per gel
- ✓ Fewer gels needed per race
- ✓ Dual-source carb ratio for max absorption
- ✗ Large packet (75g)
- ✗ May be too much for some stomachs
- ✗ Requires adequate water intake
The Crown Sport HyperGel 45 is the most concentrated gel on this list, packing a massive 45g of carbohydrates into a single packet. That is nearly double what most standard gels offer, meaning you need fewer gels per race and fewer stops to fumble with packaging.
The dual-source carbohydrate formula (maltodextrin + fructose) is optimized for maximum intestinal absorption. Crown Sport is a Spanish brand that has gained a loyal following among ultra-runners and Ironman athletes who need serious caloric intake over long distances. If your stomach can handle it, one HyperGel 45 every 45 minutes gives you 60g+ of carbs per hour, right in the sweet spot for endurance performance.
Quick comparison table
| Gel | Carbs | Calories | Price | Best for |
|---|---|---|---|---|
| Maurten Gel 100 | 25g | 100 | ~3.50€ | Innovation, elite |
| SiS GO Isotonic | 22g | 87 | ~1.50€ | Isotonic, no water |
| GU Energy Gel | 23g | 100 | ~2.00€ | Most popular, variety |
| PowerBar PowerGel | 27g | 110 | ~2.20€ | Classic, high carbs |
| Clif Shot | 24g | 100 | ~1.80€ | Natural, organic |
| Enervit Isotonic | 20g | 80 | ~2.50€ | Italian, isotonic |
| High5 Energy Gel | 23g | 92 | ~1.20€ | Best value |
| Victory Energy Up | 26g | 105 | ~1.60€ | Best Spanish |
| Isostar Energy Gel | 24g | 96 | ~1.50€ | Most accessible |
| Crown HyperGel 45 | 45g | 180 | ~2.80€ | Highest carbs, ultra |
Quick summary: which one to buy
- My first energy gel: GU Energy Gel or Isostar Energy Gel
- Sensitive stomach: Maurten Gel 100 or SiS GO Isotonic
- Best value for training: High5 Energy Gel or Victory Endurance Energy Up
- Marathon (elite/serious): Maurten Gel 100 or PowerBar PowerGel
- No water needed: SiS GO Isotonic or Enervit Isotonic
- Natural/organic preference: Clif Shot Energy Gel
- Ultra-marathon / max carbs: Crown Sport HyperGel 45
Frequently asked questions
When should I take an energy gel during a race?
For a marathon, most experts recommend taking your first gel around 45 minutes into the race, then every 30-45 minutes after that. For a half marathon, one gel at 45 minutes and another around 75 minutes is usually sufficient. Always practice your gel strategy during training to find what works best for your stomach.
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Do I need to drink water with energy gels?
With most gels, yes. Standard gels are highly concentrated and need water to be absorbed properly. Taking them without water can cause stomach distress and slow absorption. The exception is isotonic gels like SiS GO Isotonic or Enervit Isotonic, which are pre-mixed with water and can be taken without additional fluids. Always check the label of your specific gel.
Can energy gels cause stomach problems?
Yes, stomach distress is the most common complaint with energy gels. This usually happens when you take too many at once, do not drink enough water with non-isotonic gels, or try a new gel on race day without testing it first. To minimize issues, always test gels during training runs, take them with water (unless isotonic), and space them at least 30 minutes apart. Maurten's hydrogel technology was specifically developed to reduce GI issues.
What is the difference between isotonic gels and regular gels?
Regular gels are concentrated carbohydrate solutions that require water to be digested properly. Isotonic gels (like SiS GO and Enervit) already contain the right amount of water to match your body fluid concentration, so they can be consumed without additional water. Isotonic gels are easier on the stomach but are larger and heavier to carry. For races with frequent aid stations, regular gels work fine. For races in remote areas or ultra-distance events, isotonic gels simplify logistics.
How many energy gels should I carry for a marathon?
Plan for 5-7 gels for a full marathon, depending on your pace and how frequently you take them. If you take one every 30 minutes starting at 45 minutes, you will need about 6-7 gels. Many runners carry 4-5 and pick up 1-2 at aid stations. Always carry one extra as a backup. If you use high-carb gels like the Crown HyperGel 45, you may need only 3-4 gels for the same carbohydrate intake.
