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 for hydrationScience In Sport 800ml clear drinks bottle with easy-mix markings, ideal for mixing SiS powders during workouts.

      Science In Sport 800ml Clear Drinks Bottle with Easy-Mix Markings for SiS Powders

      Stay hydrated effortlessly with the Science In Sport Drinks Bottle, designed specifically for SiS powders. Its clear 800 ml capacity and easy-mix markings make preparing your favorite sports drink quick and mess-free. Just add powder, some water, shake, and top up—perfect for on-the-go hydration....
      £4.77
      £6.00
      £4.77
      Save £1.23
    • Science In Sport Hydro+ electrolyte drink mix stick powder in orange mango flavor, showing the orange and mango-flavored powder packet.Science In Sport Hydro+ electrolyte drink mix stick with orange mango flavor, showing the powder inside the packaging.

      Science In Sport Hydro+ Electrolyte Drink Mix Stick Powder Orange Mango - Mango Tango

      Science In Sport Hydro+ Stick Powder Orange Mango is a scientifically crafted electrolyte drink mix designed to deliver optimal hydration whenever you need it. This convenient powder combines five essential electrolytes—Calcium, Magnesium, Chloride, Sodium, and Potassium—with three vital vitamins to support your body's hydration...
      from £6.96
      £8.00
      from £6.96
      Save £1.04
      • Mango Tango
      • Orange and Mango
    • Science In Sport GO Isotonic Energy Gel, a fast carb fuel accessory for endurance athletes, shown in its packaging.Science In Sport GO Isotonic Energy Gel packet, fast carb fuel accessory for endurance athletes, shown in the image.

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

      Experience sustained energy and optimal hydration with the Science In Sport GO Isotonic Energy Gel, the world’s first isotonic gel designed for athletes who demand quick and efficient carbohydrate delivery during exercise. Unlike traditional gels, it requires no water for consumption, drastically reducing the...
      £48.00
      £48.00
      • Fruit Salad
      • Orange
      • Apple
      • Lemon / Lime
    • Science In Sport GO Hydro Tablet | Swinnerton CyclesScience In Sport GO Hydro Tablet | Swinnerton Cycles

      Science In Sport GO Hydro Electrolyte Tablets – Hydration & Energy Boost - Pink Grapefruit

      Science In Sport GO Hydro Tablet offers an effortless way to maintain optimal hydration during your workouts or daily activities. These effervescent tablets dissolve quickly in plain water, providing essential electrolytes without any added calories, helping you stay refreshed and energized. With a variety...
      £57.77
      £64.00
      £57.77
      Save £6.23
      • Pink Grapefruit
      • Strawberry and Lime
      • Lemon
      • Pineapple and Mango
    • Science In Sport GO electrolyte drink powder in lemon lime flavor, with a scoop and packaging showing hydration and energy boost benefits.Science In Sport GO electrolyte drink powder in lemon lime flavor, shown in a resealable pouch for hydration and energy boost.

        Science In Sport GO Electrolyte Drink Powder Lemon Lime – Hydration & Energy Boost

        Science In Sport GO Electrolyte drink powder in lemon and lime flavor is expertly crafted to support endurance athletes and active individuals during prolonged exercise. This 500 g tub contains a carefully balanced mix of easily digestible carbohydrates and essential electrolytes, designed to optimize...
        £13.59
        £16.00
        £13.59
        Save £2.41
      • Science In Sport GO electrolyte drink powder, energy and hydration supplement, in a resealable pouch with orange flavor.Science In Sport GO electrolyte drink powder package for energy and hydration boost, accessories for active hydration.

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

        Science In Sport GO Electrolyte drink powder is expertly formulated to boost your energy levels while ensuring optimal hydration during intense physical activities. Combining easily digestible carbohydrates with essential electrolytes like sodium, this drink supports muscle function and endurance, especially during longer, hotter rides...
        from £13.59
        £16.00
        from £13.59
        Save £2.41
        • Orange
        • Lemon / Lime
        • Blackcurrant
      • Science In Sport Beta Fuel energy gel with electrolytes, designed for endurance athletes, shown in a portable accessory package.Science In Sport Beta Fuel energy gel with electrolytes for endurance athletes, shown in a clear packet with vibrant branding.

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

        Science In Sport Beta Fuel Energy Gel + Electrolyte is expertly crafted to support endurance athletes during prolonged moderate to high-intensity exercise lasting over two hours. This dual-source energy gel combines 40g of carbohydrate in a scientifically optimized 1:0.8 maltodextrin to fructose ratio, designed...
        from £14.62
        £15.00
        from £14.62
        Save £0.38
        • Raspberry Lemon
      • Yellow Science In Sport SiS 800ml drink bottle with measurement markings for mixing sports drinks and hydration.Yellow Science In Sport SiS 800ml drinks bottle with measurement markings for mixing and hydration.

          Science In Sport SiS Drinks Bottle 800ml Yellow with Measurement Markings for Mixing

          The Science In Sport Drinks Bottle - 800 ml in vibrant yellow is designed for athletes who value convenience and precision. Its unique markings simplify the mixing process, ensuring your SiS drink is perfectly blended every time. Made specifically for SiS products, this bottle...
          £4.77
          £6.00
          £4.77
          Save £1.23
        • Science In Sport Beta Fuel Energy Gels with nootropics, endurance energy supplement, box of 6, plastic packaging with gel packets.Science In Sport Beta Fuel energy gel box with six endurance gels, featuring nootropics for mental focus and physical stamina.

          Science In Sport Beta Fuel Energy Gel + Nootropics – Endurance Energy Box of 6

          Experience a groundbreaking fusion of physical and mental energy with the Science In Sport Beta Fuel Energy Gel + Nootropics. Specially formulated to deliver ultra-optimized fuel, this innovative gel combines a precise carbohydrate blend with Cognizin Citicoline, caffeine, taurine, and theanine to support peak...
          £14.46
          £15.00
          £14.46
          Save £0.54
        • Science In Sport Beta Fuel energy gels and nootropics pack, 30-count endurance fueling accessories for athletes and active lifestyles.Science In Sport Beta Fuel Energy Gel and Nootropics pack, endurance fuel accessories, with 30 gels for athletic performance.

          Science In Sport Beta Fuel Energy Gel + Nootropics – 30 Pack Endurance Fuel

          Experience a new level of endurance with the Science In Sport Beta Fuel Energy Gel + Nootropics, designed to fuel both your body and mind during intense physical activity. This ultra-optimised energy gel combines a scientifically balanced carbohydrate blend with powerful cognitive enhancers, helping...
          £68.09
          £72.00
          £68.09
          Save £3.91
        • Science In Sport Beta Recovery Drink Powder container, a dietary supplement for endurance and muscle repair.Science In Sport Beta Recovery Drink Powder for endurance and muscle repair, shown in a clear container with scoop and powder.

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

          Science In Sport Beta Recovery Drink Powder is expertly formulated to support endurance athletes in their journey to faster recovery and improved performance. This premium dual-source recovery drink combines carbohydrates and high-quality whey protein, scientifically proven to enhance muscle protein synthesis and replenish both...
          from £17.40
          £20.00
          from £17.40
          Save £2.60
          • Chocolate
          • Strawberry
          • Vanilla
          • Salted Caramel
        • Science In Sport Rego whey protein drink powder for muscle recovery and growth, shown in a container with scoop and powder.Science In Sport Rego whey protein powder container, muscle recovery and growth supplement, with scoop and nutritional info visible.

          Science In Sport Rego Whey Protein Drink Powder for Muscle Recovery & Growth - Chocolate

          Science In Sport Rego Whey Protein Drink Powder is expertly formulated to support muscle repair and growth following shorter, less intense workouts. With 22g of high-quality whey protein per serving, this premium powder offers an efficient way to replenish your body’s protein needs without...
          from £25.00
          from £25.00
          • Chocolate
          • Strawberry
          • Vanilla
        • Science In Sport Rego Rapid Recovery Drink Powder, vegan post-workout supplement, shown in a resealable pouch with scoop.Science In Sport Rego Rapid Recovery vegan drink powder in a container, designed for post-workout recovery.

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

          Science In Sport Rego Rapid Recovery Drink Powder is a meticulously crafted vegan-friendly recovery drink designed to replenish your body efficiently after exercise. Combining high-quality soy protein with carbohydrates, it supports muscle repair and growth while providing essential vitamins and minerals. This well-balanced formulation...
          from £17.40
          £20.00
          from £17.40
          Save £2.60
          • Chocolate
          • Strawberry
          • Vanilla
        • Science In Sport Rego Clear Whey Protein drink in a clear bottle, showing the low sugar recovery supplement with label details.Science In Sport Rego Clear Whey Protein Drink in a clear bottle, low sugar recovery supplement, designed for post-workout hydration.

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

          The Science In Sport Rego Clear Whey Protein Drink offers a light and refreshing way to support your recovery after exercise. Combining 20g of clear whey protein with 21g of carbohydrates, this recovery drink is specially formulated to help refuel and repair your muscles...
          from £25.00
          £45.00
          from £25.00
          Save £20.00
          • Raspberry and Cranberry
          • Peach
        • Science In Sport Hydro+ Lemon electrolyte powder stick for hydration and energy, with lemon flavor and convenient portable packaging.Science In Sport Hydro+ Lemon electrolyte stick powder for hydration and energy, shown in a close-up image.

          Science In Sport Hydro+ Lemon Electrolyte Stick Powder for Hydration & Energy - Lemon

          Science In Sport Hydro+ Stick Powder Lemon offers a scientifically formulated electrolyte drink mix designed to optimize hydration with a refreshing citrus twist. This convenient solution supports your body's electrolyte balance, ensuring you maintain peak performance during exercise and daily activities. Each sachet contains...
          from £6.96
          £8.00
          from £6.96
          Save £1.04
          • Lemon
        • Science In Sport GO Mini Energy Bar vegan endurance carb boost, 30-pack, close-up of the compact energy bars in packagingScience In Sport GO Mini Energy Bar vegan endurance carb boost pack of 30, compact accessories for active athletes.

          Science In Sport GO Mini Energy Bar – Vegan Endurance Carb Boost, 30-Pack - Chocolate Fudge

          Science In Sport GO Mini Energy Bar offers an easily digestible, high-carbohydrate boost designed to fuel your performance during exercise. Crafted from wholesome fruits and natural ingredients, these bars provide a practical solution to maintain energy levels efficiently. Whether you're cycling, running, or engaging...
          £42.00
          £42.00
          • Chocolate Fudge
          • Banana Fudge
          • Apple and Blackcurrant
          • Red Berry
        • Science In Sport GO Energy Drink Powder for endurance and rapid carb fueling, shown in a resealable pouch.Science In Sport GO Energy Drink Powder packet for endurance and rapid carb fueling, with colorful packaging and product label.

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

          Science In Sport GO Energy drink powder is expertly formulated to provide a rapid and easily digestible source of carbohydrate energy, perfect for fueling every ride and enhancing endurance performance. This versatile energy drink powder allows you to customize your concentration to meet your...
          £30.36
          £35.00
          £30.36
          Save £4.64
          • 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, No Artificial Sweeteners, 12-Pack - Strawberry

          Science In Sport GO Energy Bake offers a delicious and convenient way to fuel your body during any activity. This soft-filled energy bar combines a scientifically balanced carbohydrate content with a natural fruit centre, delivering 30 grams of energy and 10 grams of fructose...
          £24.00
          £24.00
          • Strawberry
          • Lemon
          • Tiramisu
        • Science In Sport GO Energy + Electrolyte GelScience In Sport GO Energy + Electrolyte Gel

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

          Science In Sport GO Energy + Electrolyte Gel is the ultimate companion for athletes seeking a fast and effective energy boost during intense workouts or competitions. As the world’s first isotonic energy gel with added electrolytes, it ensures rapid carbohydrate absorption (22 grams per...
          £56.74
          £60.00
          £56.74
          Save £3.26
          • Raspberry
          • Salted Caramel
        • Science In Sport GO Energy + Caffeine GelScience In Sport GO Energy + Caffeine Gel

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

          Experience the ultimate boost with Science In Sport GO Energy + Caffeine Gel, the world’s first isotonic energy gel enhanced with 75mg of caffeine. Designed to fuel athletes during high-intensity races and demanding endurance sessions, this gel delivers fast-absorbing carbohydrates combined with a precise...
          £63.00
          £63.00
          • Berry
          • Cola
          • Double Espresso
        • Science In Sport Energy Oat Bar for sustained energy and muscle support, shown as a nutritious snack accessory.Science In Sport Energy Oat Bar, a nutritious snack with oats for sustained energy and muscle support, shown in packaging.

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

          The Science In Sport Energy Oat Bar is your reliable companion for sustained energy and muscle support throughout the day. Crafted with real ingredients, this bar combines 40g of carbohydrates and 10g of protein, delivering a balanced blend that fuels your body efficiently. Whether...
          £29.23
          £30.00
          £29.23
          Save £0.77
          • Blueberry
          • White Chocolate Macadamia
        • Science In Sport Beta Fuel Energy Gels isotonic endurance carb boost 6-pack, portable gel packs for active athletes.Science In Sport Beta Fuel Energy Gel isotonic endurance carb boost 6-pack, convenient sports nutrition accessories for athletes.

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

          Science In Sport Beta Fuel Energy Gel offers a scientifically advanced fuelling solution designed to maximize your endurance and performance. With its innovative 1:0.8 maltodextrin to fructose carbohydrate ratio, this gel optimizes carbohydrate absorption and utilization, helping to increase your power output and delay...
          from £13.76
          £13.80
          from £13.76
          Save £0.04
          • Orange
          • Strawberry and Lime
          • Neutral
        • Science In Sport BETA Fuel energy drink powderScience In Sport BETA Fuel energy drink powder

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

          Science In Sport BETA Fuel energy drink powder is a scientifically advanced formula designed to optimize your endurance and power output. Favored by elite athletes worldwide, this energy drink has been enhanced with a precise 1:0.8 maltodextrin to fructose ratio, boosting carbohydrate oxidation efficiency...
          £37.48
          £45.00
          £37.48
          Save £7.52
          • Red Berry
          • Strawberry and Lime
          • Orange
        • Science In Sport Beta Fuel Energy Chew packets with endurance carb energy chews for athletes on a table.Science In Sport Beta Fuel Energy Chews for athletes, showing colorful endurance carb energy chew packets in a close-up shot.

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

          Science In Sport Beta Fuel Energy Chew offers a scientifically optimized source of carbohydrates in a convenient chewable format, designed to support athletes during prolonged physical exertion. These energy chews deliver 46 grams of carbohydrate per serving, combining maltodextrin and fructose in a 1:0.8...
          from £11.94
          £15.00
          from £11.94
          Save £3.06
          • Orange
          • Lemon
        • Science In Sport Hydro+ electrolyte stick powder in berry flavor, designed for hydration and electrolyte replenishment.Science In Sport Hydro+ electrolyte stick powder in berry flavor for hydration, shown in a close-up of the packaging and serving spoon.

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

          Science In Sport Hydro+ Stick Powder Berry is a scientifically crafted electrolyte drink mix designed to keep you optimally hydrated throughout your day. Whether you’re pushing your limits in sports or simply need reliable hydration, this powder offers a refreshing berry flavor combined with...
          from £6.96
          £8.00
          from £6.96
          Save £1.04
          • Berry
        • Science In Sport GO Immune Hydro TabletScience In Sport GO Immune Hydro Tablet

          Science In Sport GO Immune Hydro Tablet Orange Flavor – 8 Tubes, Immune Support & Hydration - Orange

          Science In Sport GO Immune Hydro Tablet in refreshing orange flavor is expertly formulated to support your immune system during and after intense exercise. Each effervescent tablet dissolves quickly in 500 ml of water, providing an optimal hydration experience without added calories. Infused with...
          £57.77
          £64.00
          £57.77
          Save £6.23
          • Orange
        • Science In Sport GO Energy Gel Fruit Salad flavor, box of 6, showing individual energy gel packets with colorful fruit-themed packaging.Box of six Science In Sport GO Energy Gels in Fruit Salad flavor, featuring vibrant gel packets for sports nutrition accessories.

          Science In Sport GO Energy Gel Multipack Fruit Salad Flavor - Box of 6 Gels - Fruit Salad

          Experience sustained energy with the Science In Sport GO Energy Gel multiPack in delicious fruit salad flavor. These isotonic gels provide a rapid and easily digestible source of carbohydrates, designed to fuel your body efficiently during exercise without the need for extra water. This...
          £10.50
          £10.50
          • Fruit Salad
        • Science In Sport GO electrolyte drink powder in blackcurrant flavor, hydration and endurance accessory for active athletes.Science In Sport GO electrolyte drink powder in blackcurrant flavor, shown in a resealable pouch for hydration and endurance.

            Science In Sport GO Electrolyte Drink Powder Blackcurrant Flavor for Endurance & Hydration

            Science In Sport GO Electrolyte drink powder in Blackcurrant flavor is expertly formulated to support your endurance and hydration needs during intense training sessions or long rides. Combining easily digestible carbohydrates with essential electrolytes like sodium, this drink powder ensures optimal hydration to keep...
            £13.59
            £16.00
            £13.59
            Save £2.41
          • Science In Sport GO Isotonic Energy Gel Variety Pack with 7 mixed flavors, designed for athletes' energy and hydration.Science In Sport GO Isotonic Energy Gel Variety Pack with 7 mixed flavors, ideal for active and sports nutrition.

              Science In Sport GO Isotonic Energy Gel Variety Pack – 7 Mixed Flavors Box

              Experience sustained energy with the Science In Sport GO Isotonic Gel Variety Pack, a convenient box containing 7 mixed gels. These gels were pioneers as the world’s first isotonic energy gels, designed to provide a rapid and easily digestible carbohydrate boost during exercise. The...
              £9.85
              £143.84
              £9.85
              Save £133.99
            • Science In Sport 700ml clear protein shaker bottle with mixing ball, ideal for blending SiS powders and supplements.Clear 700ml Science In Sport protein shaker bottle with mixing lid for optimal blending of SiS powders.

                Science In Sport Protein Shaker Bottle 700ml Clear – Optimal Mixing for SiS Powders

                Experience effortless hydration with the Science In Sport Protein Shaker Bottle - 700 ml. Designed specifically for optimal mixing of SiS products like Rego Build and Rego Rapid, this clear bottle features precise measurement markings that guide you through a foolproof mixing process. Its...
                £5.43
                £7.00
                £5.43
                Save £1.57
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