£2.25
SiS Beta Fuel + Nootropic Gel combines 40g of dual-source carbohydrates (1:0.8 maltodextrin:fructose ratio) with cognitive-enhancing nootropics: 250mg citicoline, 1g taurine, 200mg L-theanine, and 200mg caffeine per 60 ml gel.
Designed for endurance sessions of 2+ hours, it supports both mental and physical performance with minimal gut distress. Certified by Informed Sport.
Ingredients (per 60ml sachet)
Water
Maltodextrin (29%)
Fructose (22%)
L-Taurine (1g)
Cognizin® Citicoline (250mg)
Caffeine Anhydrous (200mg)
L-Theanine (200mg)
Natural flavourings
Acidity Regulators (Citric Acid, Sodium Citrate, Malic Acid)
Gelling Agents (Gellan Gum, Xanthan Gum)
Preservatives (Sodium Benzoate, Potassium Sorbate)
Sodium Chloride (electrolyte)
No allergens listed
Nutritional Breakdown (per 60ml serving)
Energy: 158kcal (673kJ)
Carbohydrate: 40g
Sugars: 19g
Protein / Fat / Fibre: 0g
Salt: 0.03g (12mg sodium)
Caffeine: 200mg
Taurine: 1g
Citicoline: 250mg
L-Theanine: 200mg
Suitable for Vegans/Vegetarians?
✅ Yes – suitable for vegans, gluten-free, dairy-free, soy-free, and made without artificial colours. Certified Informed Sport safe.
Allergen Information:
No known allergens declared
May contain traces of nuts due to shared production facilities
Always check packaging if highly sensitive
If you’re looking for a gel that not only fuels your body but also keeps your mind sharp during long endurance sessions, this is it. The combination of fast-acting carbohydrates and cognitive enhancers like caffeine, citicoline, taurine, and L-theanine ensure you stay energised and focused until the chequered flag.
Who it’s for:
Perfect mid-race or mid-session fuel for endurance athletes covering long miles – especially when your mind needs to stay sharp as your body tires.
What it does:
Delivers 40g of fast-absorbing dual-carb energy, plus caffeine, citicoline, taurine, and L-theanine to sharpen focus, delay mental fatigue, and maintain precision with lower perceived effort.
How I’d use it:
Open and squeeze mid-effort – ideal every 45-60 min during longer activity. It’s light on the stomach, packs a punch, and gives both your body and brain everything they could possibly need to perform.
The Science:
Caffeine–Taurine Co-Ingestion Enhances Endurance Performance
Study: A double-blind crossover study testing caffeine + taurine versus placebo, measuring effects on endurance performance in cycling under environmental stress.
Journal of Human Kinetics (Yu et al.) (2024)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11346225/
Combined caffeine and taurine intake significantly enhanced endurance performance and supported stable physiological markers under heat/humidity. This mirrors the performance strategy used in SiS’s formula with 200mg caffeine + 1g taurine.
Citicoline Supplementation and Cognitive Performance in Healthy Adults
Study: Controlled trial evaluating the effects of citicoline supplementation on memory and attention in healthy subjects over 12 weeks using standardised cognitive tests.
PMC 8349115 / Frontiers in Nutrition (Nakazaki et al.) (2021)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8349115/
Citicoline significantly improved episodic memory and attention scores – supporting its use in endurance settings to support reaction time, focus, and decision-making under fatigue.
