Every set now comes in individual packaging with an on-course fuelling plan! Fast delivery guaranteed! The SiS Marathon Nutrition Set brings together fuel for before, during and after a 42 km race. Sports nutrition for a marathon SiS GO Energy Bar — eat after breakfast or approximately one hour before the start for extra carbohydrate. SiS GO Isotonic Energy Gels — use around km 7–8 and km 12–13. They can be consumed on the move without immediately drinking water — 2 gels. SiS GO Energy + Electrolyte Gels — use around km 17–18 and km 22–23 — 2 gels. SiS GO Energy + Caffeine Gels with 75 mg caffeine — use around km 27–28 and km 32–34 — 2 gels. Within 30 minutes after the finish, mix 30 g of SiS REGO Protein Powder with water and shake well. Free gift: a wristband showing the suggested timing for each gel — 1 wristband. How to fuel a 42 km race Your pre-race diet should include familiar sources of simple and complex carbohydrate. On race morning, the source suggests 1.5–3 g of carbohydrate per kilogram of body mass and avoiding unusually high-fibre foods. After finishing, include fruit, vegetables and protein-rich foods. Use aid stations for regular small drinks of water. Plan carbohydrate loading for one or two days before the event. Test every product and the complete timing plan in training. Sports nutrition does not replace a varied, balanced diet. You may also use SiS GO Electrolyte before the race. The source suggests 500 ml after breakfast, approximately 2.5–3 hours before the start, followed by 150–200 ml between 30 and 90 minutes before the race. Adjust fluid intake for your individual sweat rate and conditions. New to long-distance SiS fuelling? Read our running tips .

SiS REGO Whey is an easy-mixing protein powder designed to help active people increase their daily protein intake. Why choose SiS REGO Whey? Smooth texture and convenient powder format. Mixes easily with water. Low in carbohydrate and fat. Key benefits Provides approximately 22 g of protein per serving, including 2.8 g of L-leucine. Protein contributes to the growth and maintenance of muscle mass. Convenient after training or between meals. What is whey protein? SiS REGO Whey is an easy-mixing whey protein powder providing approximately 22 g of protein in a single scoop, with less than 100 kcal per serving. Who is it for? Suitable for active people looking for a convenient source of high-quality protein after training or between meals. Directions for use Use up to three times per day between main meals, according to your overall dietary protein requirements. Mix 25 g of SiS REGO Whey with 175 ml of water for a standard serving. For a larger serving, mix 50 g of powder with 350 ml of water. Food supplements should not replace a varied, balanced diet.

Nutrition X Vitamin D3 + K2 combines two fat-soluble vitamins in a convenient daily tablet, particularly useful when sunlight exposure is limited. Vitamin D contributes to normal calcium absorption, the maintenance of normal bones and muscle function, and normal immune-system function. Vitamin K contributes to the maintenance of normal bones and normal blood clotting. The role of vitamin D3 and K2 Each tablet provides 2,000 IU of vitamin D3. Vitamin D contributes to normal calcium and phosphorus absorption. Vitamin D supports normal muscle and immune-system function. Vitamin K contributes to the maintenance of normal bones. The tablet format makes daily intake simple. Content per tablet Vitamin D3 — 2,000 IU (50 µg); Vitamin K2 — 75 µg. Suitable for vegetarians. Free from gluten, wheat, nuts, lactose, soya, fish and molluscs. Directions for use Take one tablet per day with breakfast during the winter months, or as advised by a qualified sports dietitian or healthcare professional. Important: vitamin K may interact with anticoagulant medicines. Seek medical advice before use if you take anticoagulants or have a relevant medical condition. Each pack contains 120 unflavoured tablets. Made in the United Kingdom and tested under the Informed Sport programme for banned substances. Explore calcium supplements .

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.