A strong choice for endurance athletes tackling events or training sessions longer than two hours who want a high-carbohydrate gel with a substantial caffeine hit and planned mental-performance support.
The SIS BETA FUEL + Nootropics Gel combines 40 g of carbohydrate with a 1:0.8 maltodextrin-to-fructose ratio, giving you a substantial serving of dual-source fuel in a single 60 ml sachet. It is designed for prolonged endurance exercise, particularly the latter stages when maintaining physical output and concentration becomes more demanding. The semi-liquid, free-flowing texture is easy to consume directly from the packaging.
Alongside the carbohydrate, each gel contains 200 mg caffeine, 250 mg Cognizin® Citicoline, 1 g L-Taurine and 200 mg L-Theanine. The combination is intended to support alertness, focus and mental performance as fatigue builds. In practical testing, the caffeine was noticeable as a useful part of the gel, although the extra nootropic ingredients did not produce an obvious difference for every tester.
The Lemon & Lime flavour has a sour citrus profile with lime notes and a bitter aftertaste. Its 60 ml format provides more carbohydrate than many smaller gels, but it is also bulkier to carry, and some users may prefer to take water alongside it. Use it as part of a wider fuelling plan: SIS recommends combining BETA Fuel products to reach 80–120 g of carbohydrate per hour, while limiting this specific nootropic gel to one serving per day. It is vegan and vegetarian, and is manufactured in the United Kingdom.
40 g carbohydrate per gel
A substantial single-serving hit helps you carry more fuel in fewer sachets during long rides, runs and races.
1:0.8 dual-source formula
Maltodextrin and fructose provide two carbohydrate sources for a high-intake endurance fuelling strategy.
Caffeine plus nootropic blend
Each gel contains 200 mg caffeine, 250 mg Cognizin® Citicoline, 1 g taurine and 200 mg L-theanine to support alertness and focus.
Built for the late stages
Designed for prolonged efforts over two hours, particularly when fatigue begins to affect concentration and decision-making.
Free-flowing gel texture
The semi-liquid consistency can be consumed directly from the sachet without mixing or preparation.
Lemon & Lime flavour
A sour lemon profile with lime back notes and a bitter finish for customers who prefer a sharper citrus taste.
Vegan and vegetarian
Suitable for vegan and vegetarian fuelling plans, with no listed EU allergens including gluten, milk, soya, nuts or peanuts.
General
Nutrition per serving
Nutrition per 100 g
Active ingredients
Ingredients and composition
Formula and use
Physical characteristics
Dietary suitability
Packaging and storage
Advisory and quality information
BETA FUEL dual-source carbohydrate formula
Combines maltodextrin and fructose in a 1:0.8 ratio to provide 40 g of carbohydrate in one gel and support high carbohydrate intake during longer endurance sessions.
BETA FUEL isotonic fuelling solution
Provides a convenient, free-flowing gel designed to deliver carbohydrate with minimal risk of gastrointestinal discomfort.
Cognizin® Citicoline
A branded nootropic ingredient included at 250 mg per gel to support cognitive function and information processing.
Nootropic blend
Combines Cognizin® Citicoline, caffeine, L-Taurine and L-Theanine to support alertness, focus and mental performance when fatigue builds.
Caffeine and L-Theanine combination
Pairs 200 mg of caffeine with 200 mg of L-Theanine to support alertness while helping reduce the jitters associated with caffeine alone.
Informed Sport certification
Science in Sport products are endorsed by the Informed Sport programme, providing additional assurance for athletes subject to supplement-testing requirements.
SIS is a sports nutrition brand founded in 1992 and focused on fuelling endurance and high-intensity exercise. It is known for developing practical carbohydrate, hydration and recovery products for athletes.
SIS introduced what it describes as the world's first isotonic energy gel, designed to provide carbohydrate during exercise without requiring additional water. The GO isotonic gel range subsequently received the Queen's Award for Enterprise.
