Best Running Gels 2026 — Maurten vs SiS vs Huma Compared

If you’ve ever bonked at mile 20 of a marathon, you know the sinking feeling. Your legs turn to concrete, your brain gets foggy, and the finish line feels impossibly far away. Running gels exist to prevent exactly that — they’re portable, fast-acting carbohydrate fuel designed to keep you moving when your glycogen stores run dry.

But with so many options on the market in 2026, picking the right gel can feel overwhelming. Maurten’s hydrogel technology, SiS’s isotonic formula, Huma’s natural chia-based approach, Spring Energy’s real-food philosophy, and GU’s tried-and-true caffeinated options all promise to be the answer. So which one actually is?

I’ve tested all of these during training blocks and races over the past year. Here’s what I found.

Running Gel Comparison Table

Gel	Price Per Unit	Carbs	Caffeine Option	Taste	Consistency	Stomach Friendliness
Maurten Gel 100	$3.50	25g	No	Neutral/no flavor	Smooth hydrogel	★★★★★
Maurten Gel 160	$4.00	40g	Yes (Caf 100)	Neutral	Smooth hydrogel	★★★★★
SiS GO Isotonic	$2.00	22g	Yes	Multiple flavors	Thin/liquid	★★★★☆
Huma Chia Gel	$2.50	22g	Yes	Real fruit flavors	Thick with chia seeds	★★★★☆
Spring Energy	$4.50	25–45g	No	Savory/sweet varieties	Thick, puree-like	★★★★☆
GU Energy	$1.50	21g	Yes (up to 70mg)	Wide variety	Thick, syrupy	★★★☆☆

How Running Gels Work

Running gels are concentrated carbohydrate packets — typically a mix of glucose, fructose, or maltodextrin — designed to be absorbed quickly into your bloodstream. When you run, your body primarily burns glycogen (stored carbs) for energy. Most runners store enough glycogen for roughly 90 minutes of hard effort. After that, you need external fuel.

Gels bypass the slower digestion required by solid food. The simple sugars they contain move from your stomach to your bloodstream relatively fast, giving you usable energy within 5–15 minutes of consumption. Some gels use a dual-transport system (glucose + fructose) to maximize absorption rates up to 90g of carbs per hour — well above what glucose alone can deliver.

The key differentiator between modern gels is how they deliver those carbs while minimizing GI distress. That’s where hydrogel technology, isotonic formulations, and natural-ingredient approaches come in.

When to Take Gels During a Marathon

Timing matters more than most runners realize. Here’s a general framework:

• First gel: Around 45–60 minutes in (miles 5–7). Don’t wait until you feel depleted.
• Subsequent gels: Every 30–45 minutes after that, depending on your carb target.
• Final gel: Around mile 22–23 for that last push to the finish.

Most elite coaches now recommend targeting 60–90g of carbs per hour during a marathon. That means you’re looking at 2–3 gels per hour if they’re your sole fuel source, or fewer if you’re combining with sports drinks.

The golden rule: practice your fueling strategy in training. Your race day plan should never be a surprise to your stomach. If you’re still building your marathon kit, check out our gear guide for beginners for a full overview of what you need.

Hydrogel vs Traditional Gels

Maurten changed the game when they introduced hydrogel technology. Here’s the difference:

Traditional gels are hypertonic — they have a higher concentration of particles than your body fluids. When they hit your stomach, your body pulls water into the gut to dilute them before absorption. This is what causes the cramping, bloating, and nausea many runners experience.

Hydrogel technology (Maurten) encapsulates the carbohydrates in a biopolymer matrix that forms a gel-like structure at stomach pH. This allows the carbs to pass through the stomach more quickly and get absorbed in the intestine without drawing extra water. The result: more carbs delivered with less GI distress.

Isotonic gels (SiS) take a different approach — they’re pre-diluted to match your body’s fluid concentration, so they don’t require additional water to digest. The trade-off is lower carb density per packet.

In practice, Maurten’s hydrogel lets you take in more carbs per hour without the stomach issues. But it comes at a premium price, and some runners find the lack of flavor psychologically unsatisfying during long efforts where taste can be a morale boost.

Natural vs Synthetic Gels

The “natural vs synthetic” debate in running gels comes down to ingredient philosophy:

Synthetic/engineered gels (Maurten, GU, SiS) use lab-designed carbohydrate blends — maltodextrin, engineered glucose polymers, artificial flavors and sweeteners. They’re optimized for absorption speed and consistency.

Natural gels (Huma, Spring Energy) use real food ingredients — fruit purees, honey, chia seeds, rice, and other whole foods. They deliver similar carb counts but through less processed sources.

Does it matter for performance? Honestly, for most runners the difference is negligible. Your body breaks everything down to simple sugars regardless. But there are legitimate reasons to prefer natural options:

• Fewer artificial additives if you’re sensitive to them
• More pleasant taste for some runners
• Better alignment with whole-food dietary philosophy
• Chia seeds (Huma) add a small amount of omega-3s and fiber

The downside of natural gels: they tend to be thicker, may have a shorter shelf life, and some runners find the texture harder to get down mid-race. If you’re pairing your nutrition with the right footwear, our marathon shoe guide has the latest picks.

Best Gel For Every Runner Type

Best for Sensitive Stomachs: Maurten Gel 100

If GI issues have ruined races for you in the past, Maurten is worth every penny. The hydrogel technology genuinely delivers on its promise of stomach-friendly fueling.

Pros:

• Almost zero GI distress for most runners
• Smooth, easy-to-swallow consistency
• No need to take with water
• Used by elite marathoners worldwide

Cons:

• Expensive at $3.50–$4.00 per gel
• No flavor can feel boring during long races
• Limited variety

Best Budget Option: GU Energy

GU has been around forever for a reason. It works, it’s widely available, and at $1.50 per gel you can actually afford to fuel properly during training.

Pros:

• Cheapest option per gel
• Huge flavor variety
• Caffeine options (20mg, 40mg, or 70mg)
• Available everywhere — gas stations, running stores, race expos

Cons:

• Thick, syrupy texture some runners dislike
• Higher chance of GI issues, especially with caffeine variants
• Requires water to wash down
• Artificial ingredients

Best Natural Ingredients: Huma Chia Gel

Huma strikes the best balance between natural ingredients and actual performance. The chia seeds add texture but also provide sustained energy release alongside the faster-acting fruit sugars.

Pros:

• Real fruit ingredients you can actually taste
• Chia seeds for sustained energy
• No artificial flavors or sweeteners
• Good flavor variety (Strawberry, Mango, Apple Cinnamon)

Cons:

• Chia seed texture isn’t for everyone
• Slightly thicker than ideal for mid-race
• 22g carbs means you need more packets per hour

Best for Maximum Carbs: Spring Energy

If you’re targeting 90g+ carbs per hour and want real food doing the heavy lifting, Spring Energy’s higher-calorie options (like the Awesome Sauce at 45g carbs) let you carry fewer packets.

Pros:

• Up to 45g carbs per gel — fewer packets needed
• Real food ingredients (rice, fruit, honey)
• Savory options available for flavor fatigue
• High calorie density

Cons:

• Most expensive option at $4.50 per gel
• Very thick consistency — hard to eat at race pace
• Heavier to carry
• Shorter shelf life than synthetic options

Recovery Matters Too

No matter which gel you choose, post-race recovery is just as important as your fueling strategy. Proper recovery tools and nutrition after your marathon help you bounce back faster and avoid injury. Check out our recovery tools guide for what actually works.

Frequently Asked Questions

Do I need to take water with running gels?

It depends on the gel. Maurten’s hydrogel and SiS GO Isotonic don’t require water — they’re designed to be absorbed without dilution. Traditional gels like GU and thicker options like Huma and Spring Energy work best with a few sips of water to aid digestion and prevent that sticky mouth feeling.

How many gels should I take during a marathon?

Most runners need 6–10 gels for a full marathon, depending on carb content and your hourly target. If you’re aiming for 60g carbs/hour (a good starting point), that’s roughly 3 GU gels or 2 Maurten Gel 160s per hour. Adjust based on your body weight, pace, and what you’ve practiced in training.

Can running gels cause stomach problems?

Yes, and it’s one of the most common complaints. Hypertonic gels (GU, most traditional options) are more likely to cause GI distress because they draw water into your gut. Eating too many too quickly, not drinking enough water, or trying a new gel on race day all increase the risk. Hydrogel (Maurten) and isotonic (SiS) options were specifically designed to reduce this.

Are expensive gels actually better?

Not necessarily better in terms of raw carbohydrate delivery — a carb is a carb. But premium gels like Maurten offer genuine advantages in stomach comfort and absorption efficiency. If you’ve never had GI issues, a budget option like GU works perfectly fine. If you have a sensitive stomach, the extra cost of Maurten can be race-saving.

Should I use caffeinated gels?

Caffeine is proven to enhance endurance performance — typically a 2–4% improvement. Most runners benefit from saving caffeinated gels for the second half of their race (miles 16+) when fatigue really sets in. Start with 40mg caffeine gels and see how you respond. GU offers the widest caffeine range, while Maurten Caf 100 delivers 100mg in their Gel 160 variant. Don’t try caffeinated gels for the first time on race day.

The Bottom Line

There’s no single “best” running gel — it depends on your stomach, your budget, and your preferences. If money is no object and you want the smoothest fueling experience, go Maurten. If you’re cost-conscious and don’t have stomach issues, GU delivers reliable energy at a fraction of the price. If natural ingredients matter to you, Huma and Spring Energy are excellent choices that prove real food can power real performance.

Whatever you choose, the most important thing is to practice with it before race day. Your training runs are your fueling lab — use them.