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Big news: truefuels is our new Official Nutrition and On-Course Fuelling Partner!
04.02.26

We’re thrilled to announce that truefuels is joining Castle Race Series as our Nutrition and On-Course Fuelling Partner across all of our events! This exciting partnership underlines our commitment to helping every participant — from first-timers to elite competitors — perform at their best with the right fuel for the road ahead.

What Is truefuels?

truefuels is a science-driven performance nutrition brand built by athletes, for athletes. Co-founded by double Olympic triathlon gold medallist Alistair Brownlee, truefuels combines elite sporting insight with cutting-edge metabolic science to deliver fuel that supports endurance, hydration, recovery, and performance at the highest level.

Their philosophy is simple but powerful: athletes deserve fuel that’s pure, purposeful, and proven to work. That’s why every product is crafted with only the essential ingredients — no unnecessary additives, no gimmicks — just clean, performance-focused nutrition that helps your body go further.

What Makes truefuels Different?

truefuels isn’t just another energy brand — it’s nutrition engineered with precision:

  • Scientifically Optimised Energy Gels — Each gel delivers a powerful 40g of carbohydrates in a 1:1 glucose-to-fructose blend for fast absorption and sustained energy.

  • Electrolyte Balance You Can Trust — Multiple salt options allow athletes to tailor hydration to their sweat rate and race conditions.

  • Backed by Elite Athletes & Research — Every product is tested in the lab and in the field by elite endurance athletes to ensure performance and gut comfort.

  • Clean, Simple Ingredients — Only what you need, nothing you don’t.

Why This Matters for Our Events

Whether you’re lining up for your next personal best, racing hard for a podium, or simply soaking in the atmosphere — whatever your discipline, nutrition matters.

With truefuels as our Nutrition and On-Course Fuelling Partner, we’re proud to bring you:

  • 🚀 Race-proven nutrition you can rely on

  • 🧠 Science-led fuelling strategies to support your performance

  • 🤝 Support from a brand that truly understands endurance sport

  • ⏱️ truefuels available on course at our longer-distance events, giving athletes access to consistent, high-quality fuel throughout their race.

Try truefuels Before The Big Day

If you want to perform at your best, your fuelling matters.

truefuels gels are premium, race-proven nutrition designed to help you train harder, recover faster, and race stronger.

Purchase your truefuels gels today, start using them in training, and give your body the best fuel available.

For our longer* races, truefuels will be available across the race course — so there’s no need to carry everything from the start.

*venue and route dependant. 

Fuel your goals

Fuel Smart, Go Further

We’re excited to welcome truefuels into our event family and look forward to seeing athletes across all distances benefit from world-class performance nutrition — alongside support from our incredible network of event partners who help make race day possible.

Stay tuned for more information on product availability, fuelling advice, and exclusive content from truefuels experts.

Be your best. Fuel with the best.