Collection: SiS

Science in Sport (SiS) Nutrition is a leading sports nutrition brand, founded in the UK in 1992 and built on a rigorous, science-first approach to fuelling endurance performance. Used by professional athletes, SiS products are developed in collaboration with sports scientists to deliver measurable results when it matters most.

From fast-acting energy gels and hydration tablets to protein and recovery powders, the SiS range covers every stage of your training and racing nutrition. Every product is Informed-Sport certified — independently tested and free from banned substances — so you can fuel with complete confidence at any level of competition.

• GO Isotonic Energy Gels — the world's first isotonic gel, no water needed
  
• Hydration tablets and electrolyte drinks for personalised sweat replacement
• REGO Rapid Recovery protein powders for post-run muscle repair
• Beta Fuel gels — high-carbohydrate endurance fuelling with Nootropics
• Informed-Sport certified — independently tested and banned substance free
• Trusted by professional teams and elite endurance athletes worldwide