SIS Gels

SiS Gels: GO Isotonic Energy Gel and Beta Fuel Gel

Science in Sport (SiS) makes energy gels for endurance athletes in two lines: the GO Isotonic Energy Gel with 22 grams of carbohydrates per gel and the Beta Fuel Gel with 40 grams of carbohydrates per gel. Both lines are available in a standard version and in variants with caffeine or extra electrolytes.

On this page you can see how many carbohydrates, sodium and caffeine are in each gel, so you can easily compare the gels. The SiS gels are Informed Sport certified.

GO Isotonic Energy Gel: 22 grams of carbohydrates

The SiS GO Isotonic Energy Gel is a 60 ml gel with 22 grams of carbohydrates from maltodextrin. The gel is isotonic: the concentration is matched to that of body fluids, so you do not need to drink water with it. The standard gel contains no caffeine and is available in flavors such as Lemon & Lime, Orange, Apple, Fruit Salad, Tropical, Cherry, Blackcurrant and Pink Grapefruit.

GO Isotonic Energy Gel + Caffeine: 75 or 150 mg of caffeine

The same isotonic gel with 22 grams of carbohydrates, supplemented with caffeine. The Cola and Berry flavors contain 75 mg of caffeine per gel, while the Double Espresso variant contains 150 mg of caffeine per gel. Caffeine-containing gels are not recommended for children and pregnant women; pay attention to your total caffeine intake throughout the day.

GO Isotonic Energy Gel + Electrolyte: with sodium and potassium

This variant combines 22 grams of carbohydrates with electrolytes: 118 mg of sodium, 9.5 mg of potassium and 1.5 mg of magnesium per gel. Available in Raspberry and Salted Caramel, among others.

Beta Fuel Gel: 40 grams of carbohydrates

The Beta Fuel Gel contains 40 grams of carbohydrates per 60 ml gel, from maltodextrin and fructose in a ratio of 1:0.8. The gel is intended for endurance athletes who want to consume a lot of carbohydrates per hour during long efforts. Available in Strawberry & Lime, Orange and Neutral.

Beta Fuel Gel + Electrolytes: 200 mg of sodium

The Beta Fuel Gel with electrolytes contains 40 grams of carbohydrates (1:0.8 maltodextrin and fructose) and 200 mg of sodium per gel, from added sodium chloride. The gel contains no caffeine. Available in Raspberry & Lemon.

Beta Fuel Gel + Nootropics: with 200 mg of caffeine

The same 40 grams of carbohydrates as the standard Beta Fuel Gel, supplemented with 200 mg of caffeine, 200 mg of L-theanine, 1 g of taurine and 250 mg of Cognizin® citicoline per gel. Due to the caffeine content, a maximum of 1 gel per day applies. Available in Lemon & Lime and Apple.

Which SiS gel do you choose?

The main difference is the amount of carbohydrates per gel: 22 grams for the GO line and 40 grams for the Beta Fuel line. Only the GO gels are isotonic. In addition, you choose based on flavor and whether you want a variant with caffeine or extra sodium. Always follow the instructions on the packaging before use and try a new gel during a training session first.

Want to know more? Read our explanation about the SiS Go Isotonic Energy Gel, or discover in our nutrition plan what to eat before a half marathon. Compare gels in our blog SiS vs Maurten and read our tips on starting to run.