Edit: turns out it was a technical issue. Getting all sorted out did require some patience and exchanging some emails. However I am very glad with the professional attitude of Science in Sport.... See more
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Review summary
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I've been using SiS for a while now and can't fault the products but on this occasion there were delays with the order being received despite paying for next day delivery. After placing the orde... See more
Company replied
Experience is as expected. Choose, pay, receive. No issue's. Strawberry and lime gel is absolutely peng and surprisingly, so is the lime chew. Thought it would be like sticking a urinal cake in my mou... See more
Company replied
I have a regular subscription for SIS Rego protein and Beta Fuel gels, dual fuel drinks, chews and I can say honestly that they never let me down. I would 100% recommend subscribing there are lots of... See more
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Company details
About Science in Sport (SiS)
Written by the company
Science in Sport are an endurance nutrition brand focusing on the key areas of hydration, energy and recovery.
Providing a range of superb premium sports nutrition such as energy gels, energy bars, hydration tabs, protein shake powders and much more, SiS work with pioneering scientists and elite athletes such Sir Chris Hoy & Helen Jenkins. Therefore, it’s clear to see why SiS have been behind 40 Olympic Gold Medals since 1996.
SiS GO Energy Range – Carbohydrate loaded energy gels, energy bars & energy drinks for all endurance sports
SiS GO Electrolyte Range – Balance of carbohydrate energy & effective hydration
SiS GO Hydro Range – When you need hydration with virtually no calories
SiS REGO Rapid Recovery Range – To help recover, rebuild and support the body’s adaptation to training
SiS REGO Protein Range – A blend of rapidly absorbing proteins to provide a protein boost and support muscle rebuild
Providing a range of superb premium sports nutrition such as energy gels, energy bars, hydration tabs, protein shake powders and much more, SiS work with pioneering scientists and elite athletes such Sir Chris Hoy & Helen Jenkins. Therefore, it’s clear to see why SiS have been behind 40 Olympic Gold Medals since 1996.
SiS GO Energy Range – Carbohydrate loaded energy gels, energy bars & energy drinks for all endurance sports
SiS GO Electrolyte Range – Balance of carbohydrate energy & effective hydration
SiS GO Hydro Range – When you need hydration with virtually no calories
SiS REGO Rapid Recovery Range – To help recover, rebuild and support the body’s adaptation to training
SiS REGO Protein Range – A blend of rapidly absorbing proteins to provide a protein boost and support muscle rebuild
Science In Sport - Leaders in Endurance Sports Nutrition Products
Written by the company
- TRUSTED BY ELITE OLYMPIC ATHLETES & WORLD CHAMPIONS
- Being a leading endurance nutrition manufacturer, we are proud to be part of HFL’s list of Informed-Sport approved brands and products, having been the first to pass through the sport laboratory’s evolved banned substance testing programme. It’s no wonder our ambassador is Sir Chris Hoy.
- SiS CUSTOMER SERVICE
- We value each and every one of our customers, whether you buy from us directly or from any of our trusted partners around the world. Every customer receives personal support and guidance from our expert team of professional customer service advisors and qualified sports nutritionists.
- SiS REWARDS LOYALTY PROGRAMME
- The SiS Rewards programme has been designed to reward our ever-growing loyal customer base with fantastic exclusive offers and a chance to earn money off every single order placed at scienceinsport.com. Joining the SiS Rewards scheme is FREE and discounts can be earned today.
- EXCLUSIVE BUNDLES & PRODUCTS
- Scienceinsport.com gives customers the opportunity to try a range of different products and flavours in various money-saving bundles not available anywhere else. Addressing key areas such as energy products, hydration tabs and protein products, these online-exclusive bundles contain individual sachets and packets that are great for gifts as well as convenient to take out and about.
SCIENCE IN SPORT GUARANTEE
If you’re not fully satisfied, please get in touch
We pride ourselves on providing an exceptional experience for all our customers. From ordering their favourite sports nutrition on our website to feeling the positive benefits whilst competing in races, we strive to ensure every customer gets the full SiS experience. If you are unhappy with your order, please do not hesitate to get in touch with our friendly customer service team who will be happy to help you.
Contact info
United States
- support@scienceinsport.com
- www.scienceinsport.com
4.2
Great
66K reviews
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Always excellent on delivery product is…
Always excellent on delivery product is the best
2 October 2026
Reply from Science in Sport (SiS)
Hi Elizabeth,
We are so thrilled to hear that your items arrived so quickly and that you consider our range to be the very best. Thank you so much for taking the time to share your wonderful feedback with us!
Kind regards
Team SIS
Always had fantastic service from…
Always had fantastic service from Science in Sport
30 September 2026
Reply from Science in Sport (SiS)
Hi Paul,
Thank you for your feedback. We are glad you always enjoyed our excellent service.
Kind regards
Team SiS
Fast delivery and superb customer…
Fast delivery and superb customer service, thanks.
30 September 2026
Reply from Science in Sport (SiS)
Hi Karen,
We are delighted to hear that you experienced prompt shipping and exceptional assistance from our team. Thank you so much for taking the time to share your positive experience with us.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Lisa,
We truly appreciate you taking the time to share your feedback. It is wonderful to hear that you are so satisfied with the quality of our items and the speed of our shipping.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Marcus,
We are so pleased to hear that your order arrived quickly and was packaged securely. Thank you very much for taking the time to share your positive experience with us!
Kind regards
Team SiS
I've used SiS for years
I've used SiS for years. Good quality products at sensible prices in a fitness landscape that seems to be pricing people out of researched nutrition.
12 May 2026
Reply from Science in Sport (SiS)
Hi Robert,
We're happy to hear that you have trusted our products over the years. We appreciate your positive feedback regarding our commitment to keeping scientifically backed nutrition accessible and reasonably priced for everyone.
Kind regards
Team SiS
Great product & always reliable
Great product & always reliable, easy and ontime - simples
30 September 2026
Reply from Science in Sport (SiS)
Hi Paul,
We are glad you enjoyed your experience with our dependable service and seamless, punctual deliveries. Thank you for your review.
Kind regards
Team SiS
GO Electrolytes are good to go :)
GO Electrolytes has become my “daily driver”. Nice not overpowering taste. Isotonic & Beta Fuel gels are nice, package opening could use a tweak. Tried the nootropics on my longer run last week. It’s got caffeine!! Might have helped a bit, long run anyway. Trying the chews today.
3 October 2026
Reply from Science in Sport (SiS)
Hi there,
We are glad you enjoyed your experience with our products.
We hope your run with the chews goes just as well, and we truly thank you for taking the time to share your helpful thoughts with us.
Kind regards
Team SiS
Top Service
Smooth process for quick efficient replenishment.
Products chosen online and delivered within 24hrs. Thank you.
30 September 2026
Reply from Science in Sport (SiS)
Hi John,
Thank you for your review. We're glad you enjoyed your experience with our fast order fulfilment and seamless online purchasing. We appreciate your support!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Glenn,
Thank you for your feedback. We are sorry to hear that your order did not arrive, we are currently auditing our delivery process to ensure shipments reach our customers reliably.
We are glad to hear our team were able to assist with a refund.
Kind regards
Team SiS
Used for over a year commuting and…
Used for over a year commuting and training on the bike, no issues.
26 September 2026
Reply from Science in Sport (SiS)
Hi Dave,
We are happy to hear that our product has been reliable for your daily cycling commutes and training sessions over the past year. Thank you very much for sharing your positive experience with us.
Kind regards
Team SiS
Great products cycling
Great products for before, during and after cycling including recovery. Very efficient service.
28 September 2026
Reply from Science in Sport (SiS)
Hi,
Thank you for sharing your positive feedback with us! We are thrilled to hear that our range supports every stage of your rides and that you experienced fast, reliable service.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
Thank you for your feedback. We regret the delay in your shipment and are looking into our delivery process to ensure your items arrive promptly.
Kind regards
Team SiS
I still have not receieved this order
I still have not receieved this order. No one also answered my previous review so far. Your customer service gave me a tracking number that doesnt move to anywhere
order number is 9000668857
30 September 2026
Reply from Science in Sport (SiS)
Hi Paolo,
Thank you for taking the time to share your feedback with us.
We recognize how frustrating it is to wait for your order after being notified that it was sent, only to see no movement on the tracking details after three days. We are actively investigating this delay with our shipping team and the courier.
We can however see a refund for your order has been provided.
We apologise for the inconvenience caused.
Kind regards
Team SiS
Great products but poor delivery
Great products, however paid an additional £6 for next day delivery but didnt arrive until almost a week after.
29 September 2026
Reply from Science in Sport (SiS)
Hi Bruce,
We are glad you enjoyed our products, but we sincerely apologize for the delay in receiving your order. We are looking into our delivery services to ensure prompt shipments moving forward. Thank you for your feedback.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Timothy,
We are glad you enjoyed your experience with our user-friendly product. Thank you for taking the time to share this positive feedback with us!
Kind regards
Team SiS
Fast delivery and the product worked…
Fast delivery and the product worked well for me in my training and half marathon.
27 September 2026
Reply from Science in Sport (SiS)
Hi Robert,
We are so thrilled to hear that your order arrived quickly and supported you effectively throughout your training and half marathon. Congratulations on your achievement!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi,
Thanks for your feedback!
Kind regards
Team SiS
SIS make some great products
SIS make some great products, and particularly like the GO powder, tastes good and really adds a boost while exercising hard
27 September 2026
Reply from Science in Sport (SiS)
Hi Paul,
It is wonderful to hear that you enjoy the flavour of our energy drink mix and that it gives you an extra lift during intense workouts. Thank you for taking the time to share your positive experience with us.
Kind regards
Team SiS
The order should have included a pack…
The order should have included a pack of energy gels as a promotional gift, whilst our order was complete in relation to our paid purchase, the missing items was disappointing
27 September 2026
Reply from Science in Sport (SiS)
Hello Mark,
Thank you for sharing your feedback. We regret that the expected promotional gift was missing from your delivery, as we did not hear from you in regards to this missing item, we've been unable to resolve this.
A member of our team will be in touch shortly.
Kind regards
Team SiS
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