SiS

SiS Science in Sport — Informed-Sport certified energy gels, hydration tablets and recovery nutrition trusted by elite athletes worldwide.

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