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Science in Sport

Science in Sport (SiS) believe that the most sophisticated piece of sports equipment you’ll ever own is your body. If you don’t put high performance sports nutrition in, you won’t get your full potential out.

Their range of products are researched and developed by sports scientists in conjunction with international athletes. This scientific research underpins everything we do to ensure that all our products meet the exacting standards of Informed Sport. This means that everything we do and every personal best you achieve with us, is FUELLED BY SCIENCE.

FREQUENTLY ASKED QUESTIONS Why use Science in Sport?

WHEN SHOULD I USE SIS GO ELECTROLYTE RATHER THAN SIS GO HYDRO?

Fluid is best absorbed when delivered as part of a carbohydrate-electrolyte drink, so SiS GO Electrolyte is the primary option for hydration and energy in events longer than 90 minutes.

WHEN SHOULD I USE SIS REGO RAPID RECOVERY VERSUS SIS WHEY PROTEIN?

The main difference between the two products is the carbohydrate content. SiS REGO Rapid Recovery has 25g of carbohydrate and 20g of protein per serving. It is best to use it for after training sessions which have significantly depleted your glycogen stores, such as long endurance or high intensity sessions.

SiS Whey Protein contains 23g protein per serving, with less than 2g each of carbohydrate or fat per serving. This makes it a convenient source of high quality protein with very little else, ideal for supporting your lean muscle mass.

ARE SIS GO ISOTONIC ENERGY GELS DESIGNED TO REPLACE ISOTONIC DRINKS?

No, they were designed to make it easy for an athlete to take an energy boost that is convenient during exercise and light on the stomach. More concentrated gels, particularly those which contain simple sugars such as glucose and fructose are more likely to cause gastric distress. No additional water is needed to help the absorption of SiS GO Isotonic gels, but you should still drink to remain hydrated during your activity.

  • SiS Chews Banana Fudge GO Energy Bar Mini XMiles
    SiS Energy Bars GO Energy Bar Mini XMiles
    Offer
    SiS

    GO Energy Bar Mini

    From £1.40 - £30.00 GBP

    Introducing the GO Energy Bar Mini, a power-packed snack designed to fuel your body during intense exercise and keep you energized throughout your...

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    From £1.40 - £30.00 GBP
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  • SiS Gels GO Isotonic Energy Gel 60ml XMiles
    SiS Gels GO Isotonic Energy Gel 60ml XMiles
    SiS

    GO Isotonic Energy Gel

    From £1.75 - £34.50 GBP

    SiS' GO Isotonic Energy Gel is an award-winning and highly acclaimed product designed to provide athletes with a convenient and effective source o...

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    From £1.75 - £34.50 GBP
  • SiS Gels Raspberry GO Energy + Electrolyte Gel 60ml XMiles
    SiS Gels GO Energy + Electrolyte Gel 60ml XMiles
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    SiS

    GO Energy + Electrolyte Gel

    From £1.80 - £44.80 GBP

    The SIS Original Isotonic GO Energy Gel with added electrolytes is a powerful tool for enhancing hydration and maintaining performance during prol...

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    From £1.80 - £44.80 GBP
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  • SiS Bars / Food Strawberry GO Energy Bakes XMiles
    SiS Bars / Food GO Energy Bakes XMiles
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    SiS

    GO Energy Bake

    From £2.00 - £18.90 GBP

    The revolutionary GO Energy Bake is poised to redefine the energy bar landscape with its groundbreaking design and scientific formulation. Unlike ...

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    From £2.00 - £18.90 GBP
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  • SiS Gels GO Energy + Caffeine 60ml Gel (75 / 150mgl) XMiles
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    SiS

    GO Energy + Caffeine Gel

    From £2.15 - £58.00 GBP

    GO Energy + Caffeine Gel is an exceptional energy gel meticulously crafted for high-intensity competitions and endurance events. This innovative g...

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    From £2.15 - £58.00 GBP
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  • SiS Gels Orange Beta Fuel Gel XMiles
    SiS Gels Beta Fuel Gel XMiles
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    SiS

    Beta Fuel Gel

    From £2.20 - £62.70 GBP

    Introducing the Beta Fuel Dual Source Energy Gel, a groundbreaking addition to our world-leading fuelling solution range. Engineered with a revolu...

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    From £2.20 - £62.70 GBP
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  • SiS Chews Beta Fuel Energy Chews XMiles
    SiS Chews Beta Fuel Energy Chews XMiles
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    SiS

    Beta Fuel Energy Chews

    From £2.20 - £39.60 GBP

    Are you an endurance athlete seeking a cutting-edge fueling solution to enhance your performance and push your limits? Look no further than Beta F...

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    From £2.20 - £39.60 GBP
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  • SiS Recovery Drink Chocolate SiS REGO Rapid Recovery 50g Sachets XMiles
    SiS Protein Drink REGO Rapid Recovery XMiles
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    SiS

    REGO Rapid Recovery

    From £2.50 - £37.99 GBP

    SiS REGO Rapid Recovery Powder stands at the forefront of post-exercise recovery supplements, offering a cutting-edge formula meticulously designe...

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    From £2.50 - £37.99 GBP
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  • SiS Gels Beta Fuel + Nootropics Dual Source Energy Gel XMiles
    SiS Gels Beta Fuel + Nootropics Dual Source Energy Gel XMiles
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    SiS

    Beta Fuel + Nootropics Energy Gel

    From £2.50 - £64.80 GBP

    30 x Beta Fuel + Nootropics Lemon & Lime Energy Gels for ONLY £48.60 + FREE UK Shipping Introducing the Beta Fuel + Nootropics Energy Gel: an ...

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    From £2.50 - £64.80 GBP
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  • SiS Protein Bar Peanut Butter & Jelly SiS Protein20 Vegan Bar (64g) XMiles
    SiS Protein Bar SiS Protein20 Vegan Bar (64g) XMiles
    Offer
    SiS

    Protein20 Vegan Bar

    From £2.75 - £26.95 GBP

    Introducing the Protein20 Vegan Bar, a high-protein snack designed specifically for athletes seeking a plant-based alternative that doesn't compro...

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    From £2.75 - £26.95 GBP
    Offer
  • SiS Energy Drink Beta Fuel Energy Drink (82g) XMiles
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    SiS

    Beta Fuel Energy Drink

    From £3.00 - £37.13 GBP

    Introducing the Science in Sport Beta Fuel Energy Drink, the most scientifically superior fuel on the market. Trusted by top-tier athletes, this r...

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    From £3.00 - £37.13 GBP
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  • SiS Electrolyte Drinks GO Hydro (20 Tablets Tubes) XMiles
    Offer
    SiS

    GO Hydro Electrolyte Tubes

    From £6.40 - £48.00 GBP

    GO Hydro Electrolyte is not just your ordinary hydration solution; it is a true game-changer when it comes to enhancing performance through optima...

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    From £6.40 - £48.00 GBP
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  • SiS Flasks SiS Shaker Bottle - 700ml
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    SiS

    SiS Shaker Bottle (700ml)

    £7.00
    £6.50

    WORLD-RENOWNED SUPPLEMENT BOTTLE FOR POWDERED SPORTS NUTRITION The Original Buch Steiner MixMaster Shaker®, our feature-packed SiS-branded Protein ...

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    £7.00
    £6.50
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  • SiS Trial Pack SIS Go Gel Variety Pack - 7 Pack XMiles
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    SiS

    GO Isotonic Energy Gel Variety Pack

    £15.00
    £10.00

    The GO Isotonic Energy Gel Variety Pack offers a convenient and effective way to replenish your carbohydrate stores during exercise, helping to co...

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    £15.00
    £10.00
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  • SiS Electrolyte Drinks Blackcurrant / 500g Tub GO Electrolyte Powder XMiles
    SiS Electrolyte Drinks Blackcurrant SiS GO Electrolyte Powder (1.6kg) XMiles
    Save £1.00
    SiS

    GO Electrolyte Powder

    From £12.00 - £27.99 GBP
    From £11.00 - £27.99 GBP

    GO Electrolyte Powder is a specially formulated sports drink designed to provide athletes and fitness enthusiasts with the perfect combination of ...

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    From £12.00 - £27.99 GBP
    From £11.00 - £27.99 GBP
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  • SiS Wellness Box (90 Tablets) Beta Alanine (90 tablets) XMiles
    SiS Wellness Box (90 Tablets) Beta Alanine (90 tablets) XMiles
    Save £1.00
    SiS

    Beta Alanine

    £14.99
    £13.99

    Introducing Science in Sport's revolutionary product, 100% Pure Beta Alanine! Designed to enhance your performance during short bouts of high-inte...

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    £14.99
    £13.99
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  • SiS Supplement 80 Serving Tub (400g) / Unflavoured Creatine XMiles
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    SiS

    Creatine

    £24.50

    Ideal for successive bursts of short-term, high intensity exercise. High quality version of one of the most commonly used sports supplements. 5g o...

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    £24.50
  • SiS Energy Drink GO Energy Powder 1.6kg XMiles
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    SiS

    GO Energy Powder

    £31.00
    £30.00

    GO Energy Powder is a highly effective and easily digestible carbohydrate supplement that provides a quick supply of energy. This versatile produc...

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    £31.00
    £30.00
    Save £1.00