By kazimladimeji 
SIS Cycling Gels Compared and Reviewed: Which Science in Sport Gel is Right for Your Ride?
Whether you’re tackling a tough hill climb, sprinting to a finish line, or grinding through a long endurance ride, proper fuelling can make or break your cycling performance. Science in Sport (SIS) has built a strong reputation in the world of endurance sports by offering a range of scientifically formulated energy gels tailored to different needs.
But with so many types on the market, which SIS gel is best for your ride? In this guide, we compare the most popular SIS cycling gels, highlight their benefits, and recommend when to use each.
🚴♂️ 1. SIS GO Isotonic Energy Gel
Best For: Mid-ride fuelling during moderate to intense efforts
Why It Stands Out:
This is the flagship product and the first isotonic gel on the market. It delivers 22g of carbs without needing water, making it perfect for quick energy when you’re on the move. The isotonic formula reduces the risk of stomach upset, which can happen with thicker gels.
✅ No water needed
✅ Fast-acting carbs
✅ Easy on the stomach
Recommended Use:
Take one gel every 30–45 minutes during long rides or races. Especially good during sportives or time trials.
⚡ 2. SIS GO Energy + Caffeine Gel
Best For: Late-race intensity or early morning rides
Why It Stands Out:
This gel combines the isotonic formula with 75mg caffeine for an added performance boost. Great for the final push when fatigue kicks in or when you need a mental lift.
✅ Caffeine for focus and reduced perception of effort
✅ Still isotonic – no water needed
✅ Ideal for interval training or final race efforts
Recommended Use:
Use toward the end of a ride or race, or before a hard segment or climb.
🔋 3. SIS Beta Fuel Energy Gel
Best For: Long-distance and endurance events
Why It Stands Out:
Beta Fuel gels contain 40g of carbohydrates, almost double the standard gel. They use a dual-source carb mix (maltodextrin + fructose) to maximise absorption without GI distress.
✅ High-carb fuelling for ultra rides
✅ Sustained energy release
✅ Helps avoid energy crashes
Recommended Use:
Perfect for sportives, centuries, or gravel rides. Take every 45-60 minutes to maintain high carb intake over time.
💧 4. SIS GO Hydro + Caffeine Gel
Best For: Hot days or riders prone to cramping
Why It Stands Out:
A hybrid gel that combines electrolytes, caffeine, and carbs. Ideal for hydration support and electrolyte balance when sweating heavily.
✅ Contains sodium, potassium, magnesium
✅ Caffeine + carbs for energy and focus
✅ Great for summer rides or turbo sessions
Recommended Use:
Use in hot/humid conditions, or to supplement electrolyte loss. Can complement water-only rides or rides without bottles.
🌱 5. SIS GO Organic Energy Gel
Best For: Natural energy seekers
Why It Stands Out:
Made with natural fruit juice concentrate, this gel offers a slightly more “real food” experience for those who prefer organic ingredients.
✅ Certified organic
✅ Gentle on the stomach
✅ No artificial sweeteners or preservatives
Recommended Use:
For cyclists who prefer cleaner ingredients or during light/moderate efforts when digestion is less compromised.
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⏱️ When and How to Use SIS Gels
| Type | Best Time | Carbs | Special Benefit |
|---|---|---|---|
| GO Isotonic | Any time during ride | 22g | Easy digestion, no water needed |
| GO + Caffeine | Before or near end of ride | 22g | Mental lift, sharper focus |
| Beta Fuel | Long, intense efforts | 40g | High-carb endurance fuelling |
| GO Hydro + Caffeine | Hot/humid conditions | 22g | Electrolytes + hydration + caffeine |
| GO Organic | Steady, lower intensity | 20g | Natural, organic, clean ingredients |
🧠 Final Thoughts: Which SIS Gel Should You Choose?
The best SIS gel depends entirely on your ride and body. If you’re new to gels, start with the GO Isotonic for its simplicity and digestibility. For long-distance events or ultra rides, the Beta Fuel is a game-changer. Need a mental kick for that final sprint? The GO Caffeine Gel is your best bet.
No matter your choice, using the right fuel at the right time can enhance endurance, reduce fatigue, and make your rides more enjoyable.