SiS GO Hydro is a convenient effervescent tablet that dissolves quickly in water. The low-calorie drink contains electrolytes including sodium, potassium and magnesium plus vitamins B1, B2 and B6. Why use an electrolyte drink? Fluid and electrolytes are lost through sweat during exercise. GO Hydro provides a convenient way to add electrolytes to water without a significant carbohydrate intake. What does it taste like? Despite its low sugar content and meaningful sodium level, the flavoured drink is designed to remain easy to drink during exercise. How to use SiS GO Hydro Dissolve one tablet in 500 ml of water. Consume the prepared drink within 24 hours. The source suggests 500 ml three to four hours before competition and a further 250–500 ml one hour before the start. Do not exceed four tablets per day. GO Hydro suits cycling, running and other activities where electrolyte intake is required without substantial carbohydrate. It is suitable for vegans. GO Hydro or GO Electrolyte? GO Hydro provides electrolytes with very little carbohydrate, making it useful when energy intake comes from other products. For longer sessions where carbohydrate is also required, consider SiS GO Electrolyte , which provides 36 g of carbohydrate per serving. Ingredients Citric acid, electrolytes 37% (sodium bicarbonate, sodium chloride, calcium carbonate, potassium chloride, tricalcium phosphate, magnesium carbonate), sorbitol, inulin, colour (beetroot red), natural flavouring, lemongrass powder (2.3%), starch, sweetener (sucralose), vitamins (pyridoxine hydrochloride, riboflavin, thiamine). Per serving Energy — 8.8 kcal; Carbohydrate — 0.8 g; Sugars — 0.1 g; Sodium — 0.3 g; Vitamin B1 — 0.2 mg; Vitamin B2 — 0.3 mg; Vitamin B6 — 0.4 mg; Calcium — 5.11 mmol/L; Magnesium — 0.66 mmol/L; Zinc — 0.04 mmol/L; Potassium — 3.32 mmol/L. Made in the United Kingdom.

A trial set containing two SiS energy gels. Ideal for anyone trying Science in Sport gels for the first time and looking to find out how well the products suit their individual fuelling needs. What's included? SiS GO Isotonic Energy Gel — 1 gel; SiS GO Energy + Caffeine Gel with 75 mg of caffeine — 1 gel. The isotonic gel does not need to be taken with water. The caffeine gel provides 75 mg of caffeine to help support concentration and alertness towards the end of a race or training session. IMPORTANT We do not recommend trying sports nutrition from any brand for the first time on race day. Test every new product during training, ideally during a long session. This will help you understand how your body responds and reduce the risk of unexpected problems during your event.

SiS BETA Fuel + Nootropics Gel combines maltodextrin and fructose with caffeine, Cognizin® citicoline, taurine and L-theanine. It is designed for later stages of long, demanding endurance events when both carbohydrate and a measured caffeine dose are required. The carbohydrate blend uses a 1:0.8 maltodextrin-to-fructose ratio, while the gel is tested under the Informed Sport programme for banned substances. How to use the gel Use during demanding exercise lasting more than two hours as part of your total carbohydrate strategy; Combine with other BETA Fuel products such as energy chews and high-carbohydrate gels ; The source suggests using the gel approximately one hour before the end of the race; Do not consume more than one BETA Fuel + Nootropics Gel per day; Practise using it in training before competition. Content per 60 ml gel 40 g of carbohydrate: maltodextrin from maize (30%) and fructose (23%); 19 g of sugars; 1 g of taurine; 0.03 g of sodium; 250 mg of Cognizin® citicoline; 200 mg of caffeine; 200 mg of L-theanine; Water, natural flavourings, acidity regulators, gelling agents and preservatives. High caffeine content: 200 mg per gel. Not recommended for children, pregnant or breastfeeding women, or people sensitive to caffeine. Do not combine with other high-caffeine products. Available in apple and lemon flavours.

Every set now comes in individual packaging with an on-course fuelling plan! Fast delivery guaranteed! The SiS Half Marathon Nutrition Set is designed for runners aiming to achieve their best over 21 km. It includes products covering three essential needs for the distance: hydration, energy and recovery. What's in the set? Energy Bar : a convenient carbohydrate snack to eat around 30 minutes before the start. SiS GO Isotonic Energy Gel — 1 gel; SiS GO Energy + Electrolyte Gel — 1 gel; SiS GO Energy + Caffeine Gel with 75 mg of caffeine — 1 gel for an energy boost over the final kilometres. Within 30 minutes of finishing, we recommend taking 30 g of SiS REGO Protein Powder to support recovery. Add the powder to a bottle of water and shake well. Free gift: every set includes a wristband showing when to take each gel during the race — 1 wristband. How to fuel for a half marathon On race morning, after breakfast, eat a carbohydrate bar for energy and drink 150–200 ml of SiS GO Electrolyte isotonic drink to top up your electrolytes. Take the first isotonic gel at around kilometre 5–6 and the second at around kilometre 12–13. You do not need to take them with water, but remember to drink at aid stations. Take the caffeine gel at around kilometre 16–17 to help you stay focused and increase your pace towards the finish. After finishing, take SiS Cherry Juice to support recovery. To restore fluid balance, use a Science in Sport electrolyte drink for 3–5 hours after the half marathon. Additional advice Remember that SiS sports nutrition is not a substitute for a balanced, healthy diet. Plan your meals several days before the half marathon and include carbohydrate loading, fruit and vegetables. After finishing, eat foods rich in protein, fibre and vitamins. The plan below shows the recommended sports nutrition before, during and after the race. You can also buy 42 km marathon sets and half-Ironman nutrition packs on our website. 21 km fuelling plan Read more about half marathon nutrition in our blog .