Collection: SiS

SiS – Science in Sport Nutrition for Endurance Athletes

SiS (Science in Sport) is one of the world’s leading sports nutrition brands, trusted by elite athletes and everyday runners since its founding in the UK in 1992. Built on a foundation of rigorous sports science research, SiS products are designed to help endurance athletes fuel, hydrate and recover more effectively, with a range of nutrition products that cover every stage of training and racing.

From energy gels and hydration tablets to protein and recovery powders, every SiS product is developed with a science-backed approach and independently tested to Informed Sport certification, giving athletes confidence that what they are consuming is free from banned substances.

The SiS Range

• GO Isotonic Energy Gels: SiS’s flagship gel, designed to be taken without water for convenient on-the-run fuelling during trail runs and races
• GO Energy and Electrolyte drink mixes: carbohydrate and electrolyte formulas for sustained energy and hydration during long efforts
• Hydration tablets: low-calorie electrolyte tablets for targeted hydration before, during and after activity
• REGO Rapid Recovery: a post-exercise protein and carbohydrate blend to support muscle repair and glycogen replenishment after hard sessions
• Protein bars and snacks: convenient real-food options for fuelling around training

Why SiS?

• Science-backed formulas: every product is developed using sports science research and athlete testing for measurable performance outcomes
• Informed Sport certified: independently batch-tested for banned substances, trusted by professional athletes worldwide
• 30+ years of expertise: founded in 1992 and continuously refined through partnerships with elite endurance athletes and professional teams
• Isotonic gel technology: SiS GO gels are designed to be consumed without water, a significant advantage during trail running and racing
• Trusted by elite and everyday athletes: used by professional cycling teams, marathon runners and endurance athletes across the globe

Shop SiS at The Trail Co.

Fuel smarter and recover faster. Shop the full SiS Science in Sport range at The Trail Co. online or in store.