09/29/2025
🚀 Why Zone 4 Is Different From Every Other Fuel
Most race fuels are loaded with fructose, simple sugars, and artificial junk that can:
❌ Spike insulin and shut down fat oxidation
❌ Cause GI distress (cramps, bloating, bathroom stops)
❌ Lead to sugar crashes mid-race
SFuels Zone 4 flips the script.
🔬 Science-Driven Fueling
Uses Highly Branched Cyclic Dextrin (HBCD) + Maltodextrin → delivers fast energy, but with a slower gastric emptying rate, reducing gut distress and keeping blood sugar more stable than traditional glucose/fructose fuels.
Incorporates Extended Substrate™ (C8 + C10 MCTs + L-Glutamine) → protects gut lining, supports recovery, and helps with DOMS reduction post-workout.
Zero fructose, zero sugar alcohols, zero gluten → clean, stable energy without compromising performance or long-term health.
⚡ Performance + Recovery In One
Most fuels just give you carbs. Zone 4 not only fuels your threshold and race pace efforts, it also includes nutrients that actively support gut resilience, reduce muscle soreness, and speed recovery.
🏅 Trusted By Pros & Clinicians
Zone 4 is designed with input from endurance nutrition researchers (like Dr. Mikki Williden) and performance physiologists (like Dr. Dan Plews). It’s backed by science and battle-tested by elite athletes in real races.
💡 Bottom line:
Zone 4 isn’t just another carb drink. It’s a hybrid fuel system designed to let you push harder, last longer, and recover faster — without the sugar crashes or gut bombs of typical race fuels.
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