Science In Sport

Science In Sport (SiS) is a British sports nutrition brand producing scientifically formulated energy gels, hydration drinks, bars, and recovery products trusted by elite athletes, professional cyclists, and endurance sports enthusiasts worldwide. Known for their isotonic GO Energy gels, HYDRO+ electrolyte drink mixes, and evidence-based nutrition approach, SiS products are...

Science In Sport (SiS) is a British sports nutrition brand producing scientifically formulated energy gels, hydration drinks, bars, and recovery products trusted by elite athletes, professional cyclists, and endurance sports enthusiasts worldwide. Known for their isotonic GO Energy gels, HYDRO+ electrolyte drink mixes, and evidence-based nutrition approach, SiS products are a popular choice for cyclists who want reliable, gut-friendly fuelling for training and racing. At Swinnerton Cycles, we stock a range of Science In Sport nutrition products for road, MTB, and endurance cyclists.

  • Energy oat bars for sustained energy and muscle support on long rides
  • HYDRO+ electrolyte drink mix sticks for hydration and energy
  • Available in a range of flavours including lemon and orange mango
  • Scientifically formulated for endurance athletes and cyclists
  • Gut-friendly nutrition designed for use during exercise
  • British sports nutrition brand trusted by elite and amateur cyclists

Science In Sport Best Sellers

Browse our full range of cycling nutrition and cycling accessories at Swinnerton Cycles.

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  • Science In Sport 800ml clear drinks bottle with easy-mix markings for SiS powders, durable sports accessories.Science In Sport 800ml clear drinks bottle with easy-mix markings, designed for mixing SiS powders, made of durable plastic.

      Science In Sport Drinks Bottle with Easy-Mix Markings for SiS Powders

      Experience optimal hydration with the Science In Sport Drinks Bottle, engineered specifically for seamless use with SiS powders. Featuring a clear 800 ml capacity and precise easy-mix markings, this bottle enables quick, accurate preparation of your preferred sports drinks, ensuring convenience and efficiency during...
      £4.60
      £6.00
      £4.60
      Save £1.40
    • Science In Sport Beta Recovery Drink Powder in a container, designed for endurance and muscle repair.Science In Sport Beta Recovery Drink Powder for endurance and muscle repair, shown in a container with scoops and packaging.

      Science In Sport Beta Recovery Drink Powder for Endurance Muscle Repair - Chocolate

      The Science In Sport Beta Recovery Drink Powder is a scientifically formulated solution designed to support endurance athletes in achieving faster recovery and enhanced performance. Combining 60g of carbohydrates from maltodextrin and fructose with 30g of high-quality whey protein per serving, this dual-source recovery...
      from £20.00
      £64.99
      from £20.00
      Save £44.99
      • Chocolate
      • Strawberry
      • Vanilla
      • Salted Caramel
    • Science In Sport Hydro+ electrolyte drink mix stick powder in orange mango flavor, showing the orange and mango flavor packaging.Science In Sport Hydro+ electrolyte drink mix stick in orange mango flavor, showing the powder packet with bright orange design.

      Science In Sport Hydro+ Electrolyte Drink Mix Powder with Vitamins C B6 B12 - Mango Tango

      Experience scientifically formulated hydration with the Science In Sport Hydro+ Stick Powder in Orange Mango flavour. This expertly crafted electrolyte drink mix is designed to deliver essential minerals and vitamins that support optimal hydration and energy metabolism. Ideal for athletes and active individuals, it...
      from £6.72
      £8.00
      from £6.72
      Save £1.28
      • Mango Tango
      • Orange and Mango
    • Science In Sport GO Isotonic Energy Gel, fast carb fuel for endurance athletes, in a small portable gel packet.Science In Sport GO Isotonic Energy Gel packet, fast carb fuel for endurance athletes, designed for quick energy during activity.

      Science In Sport GO Isotonic Energy Gel Fast Carb Fuel Endurance - Fruit Salad

      Enhance your endurance and maintain peak performance with the Science In Sport GO Isotonic Energy Gel, a pioneering solution engineered for athletes who require rapid and efficient carbohydrate delivery. This innovative isotonic gel eliminates the need for additional water intake, significantly reducing the risk...
      £54.00
      £54.00
      • Fruit Salad
      • Orange
      • Apple
      • Lemon / Lime
    • Science In Sport GO Hydro electrolyte tablets for hydration and energy boost, shown in a clear container.Science In Sport GO Hydro electrolyte tablets for hydration and energy, shown in a clear container with tablets inside.

      Science In Sport GO Hydro Electrolyte Tablets for Hydration and Energy Boost - Pink Grapefruit

      Experience optimal hydration with the Science In Sport GO Hydro Tablet, a scientifically formulated solution designed to support your performance and recovery. These effervescent tablets dissolve rapidly in plain water, delivering essential electrolytes without any added calories, ensuring you stay refreshed and energised throughout...
      £55.78
      £64.00
      £55.78
      Save £8.22
      • Pink Grapefruit
      • Strawberry and Lime
      • Lemon
      • Pineapple and Mango
    • Science In Sport GO electrolyte drink powder packet for energy and hydration, showing the colorful packaging.Science In Sport GO Electrolyte Drink Powder accessory for energy and hydration boost, shown in a container with powder.

      Science In Sport GO Electrolyte Drink Powder for Energy and Hydration - Orange

      Experience sustained energy and optimal hydration with the Science In Sport GO Electrolyte drink powder, expertly crafted to support endurance and muscle function during demanding physical activities. This formulation combines easily digestible carbohydrates with essential electrolytes, including sodium, to replenish what is lost through...
      from £13.12
      £16.00
      from £13.12
      Save £2.88
      • Orange
      • Lemon / Lime
      • Blackcurrant
    • Science In Sport Beta Fuel energy gel with electrolytes for endurance athletes, showing the gel packet with branding and nutritional info.Science In Sport Beta Fuel energy gel with electrolytes, designed for endurance athletes, in a compact, portable accessory package.

      Science In Sport Beta Fuel Energy Gel with Electrolyte for Endurance - Raspberry Lemon

      Designed specifically for endurance athletes, the Science In Sport Beta Fuel Energy Gel + Electrolyte delivers a scientifically formulated energy solution that supports sustained performance during prolonged moderate to high-intensity exercise exceeding two hours. This advanced energy gel combines 40g of carbohydrate in an...
      from £11.09
      £15.00
      from £11.09
      Save £3.91
      • Raspberry Lemon
    • Science In Sport Beta Fuel energy chews for athletes, showing the orange and blue packaging of endurance carb energy chews.Science In Sport Beta Fuel energy chews for athletes, showing colorful endurance carb energy chew packs in a close-up image.

      Science In Sport Beta Fuel Energy Chew Endurance Carb Energy Chews - Orange

      Experience sustained energy and enhanced athletic performance with the Science In Sport Beta Fuel Energy Chew, a scientifically formulated carbohydrate source designed for athletes demanding reliable nutrition during extended physical activity. Delivering 46 grams of carbohydrates per serving through a precise 1:0.8 maltodextrin to...
      from £11.52
      £15.00
      from £11.52
      Save £3.48
      • Orange
      • Lemon
    • Science In Sport GO electrolyte drink powder in lemon lime flavor, showing the powder packet with hydration and energy boost benefits.Science In Sport GO Electrolyte Drink Powder Lemon Lime in a container, designed for hydration and energy boost during workouts.

        Science In Sport GO Electrolyte Drink Powder Lemon Lime Hydration Energy

        Experience optimal hydration and sustained energy with the Science In Sport GO Electrolyte drink powder, expertly formulated to meet the demands of endurance athletes and active individuals. This lemon and lime flavoured supplement delivers a precise balance of carbohydrates and electrolytes to enhance performance...
        £13.12
        £16.00
        £13.12
        Save £2.88
      • Yellow Science In Sport SiS 800ml drinks bottle with measurement markings for mixing, designed for fitness and hydration needsYellow Science In Sport SiS 800ml drinks bottle with measurement markings for mixing fitness supplement beverages.

          Science In Sport SiS Drinks Bottle with Measurement Markings for Mixing

          Engineered for athletes who demand precision and convenience, the Science In Sport Drinks Bottle offers an 800 ml capacity with clear, purpose-designed markings to simplify your hydration routine. This bottle is tailored specifically for SiS drink powders, ensuring accurate mixing every time without guesswork....
          £4.60
          £6.00
          £4.60
          Save £1.40
        • Science In Sport Rego Rapid Recovery Drink Powder vegan supplement, showing the orange-tinted powder in a container.Science In Sport Rego Rapid Recovery vegan drink powder, post-workout supplement in a resealable pouch.

          Science In Sport Rego Rapid Recovery Drink Powder Vegan Post-Workout - Chocolate

          Experience efficient post-exercise recovery with the Science In Sport Rego Rapid Recovery Drink Powder, a premium vegan-friendly formula designed to replenish your body’s essential nutrients swiftly. This scientifically developed recovery drink combines high-quality soy protein with carbohydrates, delivering a balanced nutritional profile that supports...
          from £16.80
          £20.00
          from £16.80
          Save £3.20
          • Chocolate
          • Strawberry
          • Vanilla
        • Science In Sport Beta Fuel energy gel isotonic endurance carb boost pack, showing six gel packets for athletic performance.Science In Sport Beta Fuel energy gel pack showing six isotonic endurance carb gels for sports nutrition and energy boost.

          Science In Sport Beta Fuel Energy Gel Isotonic Endurance Carb Boost 6-Pack - Orange

          Experience a scientifically formulated energy solution with the Science In Sport Beta Fuel Energy Gel, engineered to enhance endurance and optimise athletic performance. Featuring an advanced 1:0.8 maltodextrin to fructose carbohydrate ratio, this gel facilitates superior carbohydrate absorption and utilisation, supporting sustained power output...
          from £10.08
          £13.80
          from £10.08
          Save £3.72
          • Orange
          • Strawberry and Lime
          • Neutral
        • Science In Sport Beta Fuel energy gel with nootropics, endurance supplement, box of 6, in individual gel sachets.Science In Sport Beta Fuel energy gels with nootropics, endurance supplements in a box of 6, designed for athletic performance.

          Science In Sport Beta Fuel Energy Gel with Nootropics for Endurance

          Discover the advanced formulation of the Science In Sport Beta Fuel Energy Gel + Nootropics, expertly crafted to enhance both physical endurance and cognitive performance. This energy gel is engineered with a scientifically balanced carbohydrate blend alongside potent nootropics such as Cognizin Citicoline, caffeine,...
          £12.18
          £15.00
          £12.18
          Save £2.82
        • Science In Sport Beta Fuel Energy Gel plus Nootropics in a 30-pack, endurance fuel accessories for athletes.Science In Sport Beta Fuel Energy Gel and Nootropics pack, endurance fueling accessories, with active gel packets for performance.

          Science In Sport Beta Fuel Energy Gel with Nootropics for Endurance

          Elevate your endurance and cognitive performance with the Science In Sport Beta Fuel Energy Gel + Nootropics. This expertly formulated energy gel is engineered to provide sustained physical energy and enhanced mental focus, making it an indispensable asset for athletes engaged in demanding training...
          £72.00
          £72.00
        • Science In Sport Rego whey protein drink powder for muscle recovery and growth, shown in a container with scoops.Science In Sport Rego whey protein drink powder for muscle recovery, shown in a clear container with scoops and packaging.

          Science In Sport Rego Whey Protein Drink Powder for Muscle Recovery - Strawberry

          The Science In Sport Rego Whey Protein Drink Powder is a scientifically formulated supplement designed to support muscle repair and growth following shorter, less intense workouts. Providing 22g of high-quality whey protein per serving, this product offers an efficient and targeted approach to replenishing...
          from £29.10
          £29.99
          from £29.10
          Save £0.89
          • Chocolate
          • Strawberry
          • Vanilla
        • Science In Sport Rego Clear Whey Protein Drink in a clear bottle, showcasing the low sugar recovery supplement for post-workout recovery.Science In Sport Rego Clear Whey Protein Drink in clear bottle, low sugar recovery supplement accessory with branding visible.

          Science In Sport Rego Clear Whey Protein Drink Low Sugar Recovery - Raspberry and Cranberry

          The Science In Sport Rego Clear Whey Protein Drink is a scientifically formulated recovery solution designed to support efficient muscle repair and energy replenishment after exercise. Combining 20g of high-quality clear whey protein with 21g of carbohydrates, this product offers an optimal balance to...
          from £32.98
          £33.99
          from £32.98
          Save £1.01
          • Raspberry and Cranberry
          • Peach
        • Science In Sport Hydro+ Lemon electrolyte stick powder for hydration and energy, shown in a close-up of the packaging.Science In Sport Hydro+ Lemon electrolyte stick powder for hydration and energy, shown in a close-up image of the accessory package

          Science In Sport Hydro+ Electrolyte Stick Powder with Lemon Flavor for Hydration and Energy - Lemon

          Experience optimal hydration and sustained performance with the Science In Sport Hydro+ Stick Powder Lemon. This expertly formulated electrolyte drink mix is designed to support your body’s electrolyte balance during physical activity and everyday exertion. Featuring a precise blend of five essential electrolytes—Calcium, Magnesium,...
          from £6.72
          £8.00
          from £6.72
          Save £1.28
          • Lemon
        • Science In Sport GO Energy Drink Powder in a container, designed for endurance and rapid carb fueling during physical activity.Science In Sport GO Energy Drink Powder package, endurance and rapid carb fueling supplement, accessories for athletic performance

          Science In Sport GO Energy Drink Powder Rapid Carb Fueling Endurance - Orange

          Science In Sport GO Energy drink powder is a meticulously developed carbohydrate source designed to deliver rapid and easily digestible energy, ideal for athletes seeking to enhance endurance and sustain performance. This adaptable energy formula allows for precise concentration adjustments, enabling users to tailor...
          £29.32
          £35.00
          £29.32
          Save £5.68
          • Orange
          • Lemon
          • Blackcurrant
        • Science In Sport GO Energy Bake natural fruit energy bar, vegetarian snack with no artificial sweeteners, 12-pack.Science In Sport GO Energy Bake natural fruit energy bar, vegetarian snack with no artificial sweeteners, 12-pack.

          Science In Sport GO Energy Bake Natural Fruit Energy Bar Vegetarian - Strawberry

          The Science In Sport GO Energy Bake offers a scientifically formulated energy solution designed to support sustained performance during physical activity. Each bar delivers 30 grams of carbohydrates combined with a natural fruit centre providing 10 grams of fructose, ensuring a balanced and effective...
          £24.00
          £24.00
          • Strawberry
          • Lemon
          • Tiramisu
        • Science In Sport GO Energy + Electrolyte Gel in a squeezable packet, designed for athletes to provide isotonic energy and hydration.Science In Sport GO Energy + Electrolyte Gel in a squeezable tube, designed for athletes to provide isotonic energy and hydration.

          Science In Sport GO Energy + Electrolyte Gel Isotonic Energy Gel for Athletes - Raspberry

          Experience sustained energy and optimal hydration with the Science In Sport GO Energy + Electrolyte Gel, designed to support athletes through demanding training sessions and competitive events. As the world’s first isotonic energy gel enriched with electrolytes, it delivers 22 grams of rapidly absorbed...
          £54.78
          £60.00
          £54.78
          Save £5.22
          • Raspberry
          • Salted Caramel
        • Science In Sport GO Energy + Caffeine Gel isotonic energy gel with 75mg caffeine, packaged in a portable accessory tube.Science In Sport GO Energy + Caffeine gel in a squeeze packet, isotonic energy gel with 75mg caffeine for athletic performance.

          Science In Sport GO Energy Gel Isotonic with 75mg Caffeine Boost - Berry

          Elevate your athletic performance with the Science In Sport GO Energy + Caffeine Gel, a pioneering isotonic energy gel formulated to deliver both rapid carbohydrate replenishment and a precise 75mg caffeine boost. Engineered for athletes engaged in high-intensity competitions and demanding endurance activities, this...
          £60.00
          £60.00
          • Berry
          • Cola
          • Double Espresso
        • Science In Sport Energy Oat Bar with oats and packaging, designed for sustained energy and muscle support as a nutritious snack.Science In Sport Energy Oat Bar showing the bar's packaging and texture, a nutritious snack for sustained energy and muscle support.

          Science In Sport Energy Oat Bar Sustained Energy and Muscle Support Snack - Blueberry

          The Science In Sport Energy Oat Bar is expertly formulated to deliver sustained energy and effective muscle support, making it an essential nutritional option for athletes and active individuals. Each bar contains a precise balance of 40g of slow-release carbohydrates and 10g of protein,...
          £28.22
          £30.00
          £28.22
          Save £1.78
          • Blueberry
          • White Chocolate Macadamia
        • Science In Sport BETA Fuel energy drink powder for endurance and hydration, shown in a clear container with scoops.Science In Sport BETA Fuel energy drink powder for endurance and hydration, shown in a resealable pouch.

          Science In Sport BETA Fuel Energy Drink Powder for Endurance Hydration - Red Berry

          The Science In Sport BETA Fuel energy drink powder is a scientifically formulated solution engineered to enhance endurance and optimise power output during intense physical activity. Trusted by elite athletes globally, this advanced formula features a precise 1:0.8 maltodextrin to fructose ratio, which improves...
          £36.19
          £45.00
          £36.19
          Save £8.81
          • Red Berry
          • Strawberry and Lime
          • Orange
        • Science In Sport Hydro+ electrolyte stick powder with berry flavor for hydration, shown in the image.Science In Sport Hydro+ electrolyte stick powder in berry flavor, hydration accessory with colorful powder and packaging.

          Science In Sport Hydro+ Electrolyte Stick Powder with Berry Flavor for Hydration - Berry

          Experience optimal hydration and enhanced performance with the Science In Sport Hydro+ Stick Powder Berry. This scientifically formulated electrolyte drink mix is designed to maintain your body's fluid balance and support muscle function during physical exertion. Available in multiple configurations, each sachet delivers a...
          from £6.72
          £8.00
          from £6.72
          Save £1.28
          • Berry
        • Science In Sport GO Immune Hydro Tablets in orange flavor, 8 tubes, offering immune support and hydration.Science In Sport GO Immune Hydro Tablets in orange flavor, 8 tubes, immune support and hydration accessory for active lifestyles.

          Science In Sport GO Immune Hydro Tablet Orange Flavor Immune Support - Orange

          Experience reliable immune support and optimal hydration with the Science In Sport GO Immune Hydro Tablet, available in a refreshing orange flavour. Expertly formulated to enhance your body's natural defences during and after intense physical activity, this supplement dissolves quickly in 500 ml of...
          £55.78
          £64.00
          £55.78
          Save £8.22
          • Orange
        • Science In Sport GO Energy Gel Multipack with six fruit salad flavor gels for sports and active lifestyles.Science In Sport GO Energy Gel multipack with six fruit salad flavor gels, designed for active nutrition and energy support.

          Science In Sport GO Energy Gel Multipack Fruit Salad Flavor Isotonic - Fruit Salad

          Enhance your athletic performance with the Science In Sport GO Energy Gel multiPack, expertly formulated to deliver rapid and efficient energy replenishment. Available in a refreshing fruit salad flavour, these isotonic gels provide 22 grams of carbohydrates per serving, designed to be quickly absorbed...
          £7.89
          £7.89
          • Fruit Salad
        • Science In Sport GO Electrolyte Drink Powder in blackcurrant flavor, designed for endurance and hydration, shown in a container.Science In Sport GO electrolyte drink powder in blackcurrant flavor, showing the resealable pouch for hydration and endurance support.

            Science In Sport GO Electrolyte Drink Powder for Endurance Hydration

            Experience reliable hydration and sustained energy with the Science In Sport GO Electrolyte drink powder, expertly crafted to meet the demands of endurance athletes and fitness enthusiasts alike. This blackcurrant-flavoured formula combines a precise balance of carbohydrates and essential electrolytes, including sodium, to optimise...
            £13.12
            £16.00
            £13.12
            Save £2.88
          • Science In Sport GO Isotonic Energy Gel variety pack with 7 mixed flavors, shown in a box, for athletic energy and hydration.Science In Sport GO Isotonic Energy Gel Variety Pack with 7 mixed flavors, perfect for on-the-go energy and endurance.

              Science In Sport GO Isotonic Energy Gel Variety Pack 7 Flavors

              Enhance your endurance and maintain consistent energy levels with the Science In Sport GO Isotonic Gel Variety Pack. This convenient selection features 7 gels in multiple flavours, each formulated with an isotonic composition to deliver rapid carbohydrate absorption without the need for additional water....
              £9.51
              £143.84
              £9.51
              Save £134.33
            • Clear Science In Sport 700ml protein shaker bottle with measurements for mixing SiS powders effectively.Clear 700ml Science In Sport protein shaker bottle with mixing grate for optimal blending of SiS powders.

                Science In Sport Protein Shaker Bottle Clear with Optimal Mixing System

                Enhance your hydration routine with the Science In Sport Protein Shaker Bottle, available in a versatile 700 ml capacity. Engineered for precision and ease, this shaker is ideal for mixing a variety of SiS products such as Rego Build and Rego Rapid. Its transparent...
                £5.24
                £7.00
                £5.24
                Save £1.76
              • Science In Sport 600ml wide neck drinks bottle with clear measurement markings, designed for SiS powders and hydration.Science In Sport 600ml wide neck drinks bottle with clear measurement markings for SiS powders, made of durable plastic.

                  Science In Sport Wide Neck Drinks Bottle with Clear Markings for SiS Powders

                  Ensure optimal hydration during training or competition with the Science In Sport Drinks Bottle – 600 ml wide neck. This specialised bottle is engineered to complement SiS drink powders, featuring clear, precise markings that facilitate accurate mixing every time. Its wide neck design allows...
                  £3.68
                  £5.00
                  £3.68
                  Save £1.32
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