SiS (Science In Sport)

Shop Science in Sport (SiS) at North Sports for trusted sports nutrition designed to support energy, hydration, recovery and performance. Used by endurance athletes, runners, cyclists and fitness-focused individuals, SiS is known for practical, science-led products that help fuel training and racing more effectively.

From energy gels and electrolyte hydration to recovery products and everyday performance nutrition, the SiS range is built to support every stage of your training. Whether you are preparing for a long ride, topping up during a run or recovering after a hard session, SiS products are designed to be easy to use, effective and relevant to real-world sport.

Explore the latest Science in Sport nutrition at North Sports and discover smart fuelling solutions for training, racing and recovery.
SiS (Science In Sport)
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Echelon Stride-6 Auto-Fold Connected Treadmill - North Sports Group Echelon Stride-6 Auto-Fold Connected Treadmill - North Sports Group
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Coros Heart Rate Monitor An image of a person jogging wearing a red top and black shorts, with a white heart rate monitor band on their left wrist.
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Frequently Asked Questions

What is SiS Science in Sport?

SiS, short for Science in Sport, is a leading sports nutrition brand trusted by endurance athletes, cyclists, runners and performance-focused individuals. The brand is known for its energy gels, hydration tablets, carbohydrate drinks, recovery powders and race-day fuelling products designed to support training, competition and recovery.
What are the best SiS products for endurance training?

Popular SiS products for endurance training include SiS GO Isotonic Energy Gels, SiS BETA Fuel Gels, SiS GO Electrolyte, SiS Hydro Tablets and SiS REGO Rapid Recovery. GO Isotonic Gels are designed for quick, convenient carbohydrate intake without needing additional water, while BETA Fuel is aimed at longer endurance sessions where higher carbohydrate intake is required.
When should I use SiS energy gels, hydration products and recovery drinks?

SiS energy gels and carbohydrate products are typically used before or during exercise to help maintain energy levels, especially during running, cycling, triathlon and other endurance sports. SiS hydration products help replace fluids and electrolytes lost through sweat, while SiS REGO recovery products are designed to support post-workout recovery with a blend of carbohydrate, protein, electrolytes, vitamins and minerals.