SIS Science in Sport

GO Isotonic provides 22 g of carbohydrates per gel from a single source (maltodextrin), whilst Beta Fuel provides 40 g from a dual source (1:0.8 ratio of maltodextrin to fructose).Beta Fuel is designed for sessions lasting over 2 hours where the aim is to consume 80 to 120 g of carbohydrates per hour: its dual-source carbohydrate blend improves intestinal absorption and reduces digestive issues. GO Isotonic is better suited to moderate efforts or cyclists new to sports nutrition, as its lighter texture and smaller volume make it easier to consume without causing nausea.

Yes, this is a frequently reported issue: the Beta Fuel sachet can be difficult to tear open with your fingers whilst exerting yourself. A handy tip: make a small cut at the top of the sachet with scissors before your race or long ride. This pre-cut allows for effortless one-handed opening whilst maintaining the seal until use. SiS has gradually improved the opening system on its newer sachet versions.

SiS recommends 80 to 120 g of carbohydrates per hour for prolonged high-intensity exercise, i.e. 2 to 3 Beta Fuel gels per hour.This high intake level is possible thanks to the 1:0.8 maltodextrin/fructose ratio, which utilises two different intestinal transporters, allowing for a greater absorption rate than with a single source. To achieve this level without digestive discomfort, gradual gut acclimatisation is recommended: start with 60 g/h and increase gradually over several weeks.

Yes: SiS products carry the Informed Sport certification, which guarantees anti-doping testing on every production batch. This certification is particularly important for competitors subject to WADA testing. SiS has been the nutrition partner of numerous WorldTour teams and professional athletes, including Chris Froome, whose famous solo breakaway on the 2018 Giro (Stage 19) is often associated with Beta Fuel.

Yes, Science in Sport was founded in the UK and has been publicly listed since 2013. The brand was created around a scientific approach to sports nutrition, with products developed in collaboration with researchers and elite athletes. SiS is distributed in over 90 countries and has ranges for cycling, triathlon, running and all endurance sports.

SiS Go Hydro tablets replenish sodium, potassium and magnesium lost through sweating, preventing cramps and dehydration. Each effervescent tablet dissolves in 500 ml of water to create a light, carbohydrate-free hydration drink. They are the ideal complement to gels (energy boost) without increasing the total carbohydrate load. In hot weather or during intense exercise, mixing 1 SiS Go Hydro tablet per 500 ml of water is the recommended strategy for maintaining performance.

Yes: SiS’s REGO (Recovery) range is designed for recovery, containing protein, carbohydrates and electrolytes. REGO Rapid Recovery contains 20g of protein and 23g of carbohydrates per serving, ideally consumed within 30 minutes after exercise. Rapid intake of carbohydrates and protein after exercise optimises muscle glycogen resynthesis and fibre repair. A vegan version (pea and rice protein) is available for cyclists following a plant-based diet.

Yes: SiS GO Energy Oat bars are designed for consumption during exercise and have an easy-to-chew texture. Each bar provides around 40g of easily digestible carbohydrates from oats. Oats provide a more gradual release of carbohydrates than pure maltodextrins, making them ideal for long rides at a moderate pace. They are a good complement to gels, offering a variety of textures during multi-hour cycle races.

Yes: SiS recommends combining products from its Beta Fuel range to achieve 80–120 g of carbohydrates per hour. In practice: 1 Beta Fuel gel (40 g) + 500 ml of Beta Fuel drink (80 g/500 ml) = 120 g of carbohydrates in 1 hour. This mix-and-match approach allows you to vary the forms (liquid/solid) to limit taste fatigue on very long rides. Always test your nutritional strategy in training before applying it in competition.