SIS

SiS (Science in Sport) is a world-leading endurance nutrition brand that develops products based on scientific research. Their commitment to quality and performance is why they are the official nutrition partner to over 330 elite teams and athletes, including British Cycling, Aquatics GB, and the INEOS Grenadiers cycling team.

The SiS GO Isotonic Energy Gel was the world's first isotonic gel. Its key advantage is that it delivers a rapid supply of easily digestible carbohydrate (22g) without the need to be consumed with extra water. This formulation minimises the risk of bloating or stomach discomfort during a run, making it a favourite among elite and amateur athletes alike.

Both are designed for hydration, but they serve different purposes:

• GO Electrolyte Powder: This product provides both electrolytes for hydration and a significant amount of carbohydrate (36g per serving) for energy. It's the ideal choice for runs longer than 90 minutes where you need to refuel and rehydrate simultaneously.
• GO Hydro Tablets: These are effervescent electrolyte tablets with virtually zero calories. They are designed to ensure effective hydration before and during shorter sessions or in hot weather, without adding extra carbohydrates

The SiS REGO range is formulated to kick-start the recovery process within 30 minutes of finishing a tough workout. Products like REGO Rapid Recovery provide a precise blend of carbohydrates to replenish depleted glycogen stores, high-quality protein (like soy or whey isolate) to help repair muscle tissue, and a profile of vitamins and minerals to support overall recovery.

BETA Fuel is SiS's most advanced energy solution, developed with elite athletes to maximise performance during long endurance events. It uses a new 1:0.8 ratio of maltodextrin to fructose, which has been scientifically proven to increase the amount of carbohydrate your body can absorb per hour (from 60g up to 90g). This allows you to maintain a higher power output for longer, with a reduced risk of gastrointestinal issues.

Yes, SiS provides a wide range of products to suit different dietary needs. Many of their gels, powders, and bars are gluten-free, wheat-free, and nut-free. They also offer a comprehensive selection of vegan-friendly products, including their popular REGO Rapid Recovery powders.

This is a quality assurance mark that signifies SiS products have been rigorously tested for a wide range of substances prohibited in sport. Every batch of SiS products is tested through this program, giving athletes the confidence that what they are using is safe and free from contaminants.

Every SiS product is developed by sports scientists in conjunction with world-class athletes. This evidence-based approach ensures that each gel, drink, and bar is not only effective but also practical for use during real-world competition and training. The feedback from elite athletes is crucial to their innovation process.

For a marathon, a combination of SiS products would be optimal:

• Before: Use GO Hydro or GO Electrolyte to ensure you are fully hydrated.
• During: Consume a GO Isotonic Energy Gel or a BETA Fuel Gel every 30-45 minutes to maintain energy levels. Alternate with sips of GO Electrolyte to stay hydrated.
• After: Take a serving of REGO Rapid Recovery within 30 minutes of finishing to begin the refuelling and repair process.