Running Gel Comparison Tool
Compare gels by carbs, price, and value. Sort, filter, and find the best gel for you.
| Gel | Carbs | Price | Carbs/$ ▼ | Caffeine | |
|---|---|---|---|---|---|
| Carbs FuelCarbs | 50g | $2.00 | 25.0 | Caffeinated version available | |
| SiS Beta FuelScience in Sport | 40g | $3.49 | 11.5 | Nootropics version available (200mg) | |
| GU Energy GelGU Energy Labs | 22g | $2.20 | 10.0 | 0-40mg depending on flavor | |
| Precision PF 30Precision Fuel & Hydration | 30g | $3.12 | 9.6 | Caffeinated version available (100mg) | |
| TailwindTailwind Nutrition | 25g | $2.75 | 9.1 | Caffeinated version available (35mg/scoop) | |
| Huma Chia GelHuma | 22g | $2.50 | 8.8 | 0-50mg depending on flavor | |
| Neversecond C30Neversecond | 30g | $3.50 | 8.6 | C30+ has 75mg caffeine | |
| GU RoctaneGU Energy Labs | 25g | $3.25 | 7.7 | 0 or 35mg depending on flavor | |
| Maurten Gel 160Maurten | 40g | $5.50 | 7.3 | No | |
| Maurten Gel 100Maurten | 25g | $4.00 | 6.3 | Caf 100 version available (100mg) | |
| Spring EnergySpring Energy | 20g | $4.20 | 4.8 | Koffee flavor has caffeine |
Which gel is right for me?
Quick recommendations by use case.
Highest carbs per dollar at 25.0
Hydrogel tech, zero flavoring
50g per packet, fewest gels needed
Proven, affordable, 20+ flavors
40g carbs, mild flavors, no flavor fatigue
Found your gel? Build a minute-by-minute race-day fueling plan with your exact gel brand, target carbs/hr, and race duration.
Build Fueling Plan →How to choose a running gel
Three factors matter: carb density, carb source ratio, and gut tolerance. Carb density determines how many packets you carry and open during a race. A 50g gel means fewer packets than a 22g gel. Fewer packets means less fumbling, less trash, and less chance of dropping one.
Carb source ratio matters above 60g/hr. Your gut absorbs glucose and fructose through different transporters. A gel with a 1:0.8 or 2:1 glucose-to-fructose ratio uses both pathways, allowing absorption rates above 60g/hr that a glucose-only gel cannot match. This is the science behind the dual-transporter model (Jentjens et al. 2004).
Gut tolerance is personal. Some runners handle thick gels fine. Others need liquid formulas or hydrogels. The only way to know is to test during training, not on race day. Start with the gel you plan to race with at least 4-6 weeks out and practice taking it at race pace. For more on this, read our guide to the science of race fueling.
Why carbs per dollar matters
Gels add up fast. If you're training with gels twice a week over a 16-week marathon block, cost per serving compounds quickly. Carbs per dollar is the metric that captures this—it tells you how much fuel you actually get for your money, regardless of packet size or brand. Carbs Fuel at $2 for 50g leads the field. SiS Beta Fuel delivers 40g for $3.49. At the other end, Maurten Gel 160 gives you 40g for $5.50.
Glucose-fructose ratio explained
Your small intestine absorbs glucose through SGLT1 transporters, which max out around 60g/hr. Fructose uses a separate transporter (GLUT5). By combining both sugars, you can absorb 90-120g/hr—the target range for competitive marathon fueling. Gels with a 1:0.8 or 2:1 glucose-to-fructose ratio are designed for this. Gels that list only maltodextrin (a glucose chain) will cap your absorption at 60g/hr, which is fine for half marathons but leaves performance on the table for full marathons and ultras.
When to use caffeinated gels
Caffeine improves endurance performance at doses of 3-6mg per kg of body weight. For a 70 kg runner, that's 210-420mg total. The key is timing: save caffeinated gels for the back half of your race when perceived effort climbs and focus fades. Taking them too early wastes the boost when you don't need it and risks GI issues on top of the carb load. Popular caffeinated options include Precision PF 30 Caffeinated (100mg), Maurten Caf 100 (100mg), and Neversecond C30+ (75mg).
For in-depth reviews of each gel, read our Best Race Day Gels 2026 guide. Ready to build your race-day plan? Use the fueling calculator to get a minute-by-minute gel schedule.
Frequently Asked Questions
What is the best gel for marathon running?
The best gel depends on your priorities. For value, Carbs Fuel delivers 50g carbs at $2.00 (25.0 carbs per dollar). For sensitive stomachs, Maurten Gel 160 uses hydrogel technology with zero flavoring. For beginners, GU Energy Gel is proven with 20+ flavors. At high carb targets (90g/hr+), prioritize gels with 30-50g carbs per packet to reduce the number you carry.
What is the cheapest running gel per gram of carbs?
Carbs Fuel leads at 25.0 carbs per dollar (50g carbs for $2.00), followed by SiS Beta Fuel at 11.5 (40g for $3.49), GU Energy Gel at 10.0 (22g for $2.20), and Neversecond C30 at 8.6 (30g for $3.50). Maurten gels are the most expensive at 6.3-7.3 carbs per dollar.
How many gels do I need for a marathon?
It depends on your carb target and finish time. At 90g carbs per hour for a 3:30 marathon, you need roughly 315g of total carbs from gels. That works out to about 7 Carbs Fuel packets, 8 SiS Beta Fuel gels, 11 Neversecond C30s, or 15 GU Energy Gels. Higher carb-per-packet gels mean fewer packets to carry and open during the race.
Should I use caffeinated gels during a race?
Caffeine improves endurance performance at doses of 3-6mg per kg of body weight. Save caffeinated gels for the second half of your race when fatigue sets in. For a 70 kg runner, that is 210-420mg total. Popular caffeinated options: Precision PF 30 Caffeinated (100mg), Maurten Caf 100 (100mg), Neversecond C30+ (75mg), and GU Roctane (35mg in select flavors). Do not introduce caffeinated gels for the first time on race day.
Can I mix different gel brands during a race?
Yes, and it is a smart strategy. Many runners use a cost-effective gel like SiS Beta Fuel or GU for early miles, then switch to Maurten for the final push when stomach sensitivity is highest. The key rule: never introduce a brand you have not tested in training. Practice your exact race-day combination during long runs first.