Excellent service, straightforward ordering and prompt delivery. I have been using SiS products for a number of years and the quality is first class.
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Can't fault SiS for their quality products and their service. It would be 5 stars but I can't give 5 to anyone who continues to use Evri as their courier.
Company replied
Before I found SIS I was regularly losing energy fast and completely and on not especially long runs. Since using SIS products, especially gels, I can now cycle anything up to 90 miles no problem. Als... See more
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SIS have a great choice of products. Ordering was easy and delivery was very smooth and on time. I’ve just completed leg 1 of a sponsored ride in support of Ovacome (an ovarian cancer charity). For a... See more
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Company details
- #41 of 87 best companies in Fitness and Nutrition Service
- #7 of 8 best companies in Sports Nutrition Store
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
4.3
Excellent
66K reviews
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I ordered some gels as part of the…
I ordered some gels as part of the shipment and they were cancelled after placing my order and paying. If I would have knew in advance I would have not done the order at all as I don't want to do bits and pieces. Be clearer when something is not available or at least offer a discount for the future purchase.
July 17, 2026
Reply from Science in Sport (SiS)
Hi there,
We appreciate you sharing your feedback regarding the gels being cancelled after your order was placed. We understand your frustration with receiving an incomplete order.
We are reviewing our processes to ensure clearer communication about product availability before purchase.
We've added some loyalty points to your account as a gesture of goodwill.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Rod,
We appreciate your positive feedback and are so glad you had a great experience with our quick delivery and great products.
Kind regards
Team SiS
It just tastes better
After having tried various protein and recovery shakes. This just tastes better!
July 16, 2026
Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear that our shake stands out among others you've tried! We appreciate you sharing your positive experience.
Kind regards
Team SiS
Selling product that works
July 14, 2026
Reply from Science in Sport (SiS)
Hi there,
We're so glad to hear our product is working well for you! Thank you for your positive feedback.
Kind regards
Team SiS
SIS have always given me first class…
SIS have always given me first class service! Their products are also first class, and suite me! I cycle and run long distances,and I don’t take the products until I feel my whole body is ready to cope with the extra strain I will give it by going stronger and faster having taken the products! I tell my co runners and cyclists! It’s like puting jet fuel into an old Morris 1000! It with go very fast for a while, then things with start falling apart! So I don’t take the products until I am fit enough! I am 80 years old! Regards to you all! John Jones
July 14, 2026
Reply from Science in Sport (SiS)
Hi there,
We are so glad to hear that our products suit your needs so well!
Thank you for your fantastic feedback!
Kind regards
Team SiS
Always arrives when due
Always arrives when due. Parcel in good vondition left at designated place
July 14, 2026
Reply from Science in Sport (SiS)
Hi Gail,
We're delighted to hear that your parcel arrived on time and in excellent condition, placed exactly where you wanted it. Thank you for your positive feedback!
Kind regards
Team SiS
Back to stock up on their Beta range
Back to stock up on their Beta range. Great for the longer event or training session.
July 15, 2026
Reply from Science in Sport (SiS)
Hi Wayne,
We are so glad to hear our Beta range is perfect for your longer events and training sessions!
We appreciate your continued support.
Kind regards
Team SiS
An issue with gels with a short bbf…
An issue with gels with a short bbf date was resolved by Beth very quickly.
In general I think the SIS gels are the best tasting and best value that I have tried.
July 20, 2026
Unprompted review
Reply from Science in Sport (SiS)
Hi Axel,
We're so glad to hear that the issue with the gels was resolved quickly and efficiently!
It's wonderful to know that you find our gels to be the best tasting and best value. Thank you for your positive feedback.
Kind regards
Team SiS
Can't fault SiS for their quality…
Can't fault SiS for their quality products and their service. It would be 5 stars but I can't give 5 to anyone who continues to use Evri as their courier.
July 15, 2026
Reply from Science in Sport (SiS)
Hi there,
We appreciate your kind words about our product quality and service.
We understand your concerns regarding our courier partner and are actively reviewing all feedback to improve our delivery experience.
Kind regards
Team SiS
Easy to order
Easy to order , great communication about when and how goods would be delivered great service
July 13, 2026
Reply from Science in Sport (SiS)
Hi!
We are so happy to hear that you found the ordering process easy and that our communication regarding delivery was helpful. Thank you for your kind words about our service!
Kind regards
Team SiS
Great tasting gels
July 13, 2026
Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear that you are pleased with our gels!
Kind regards
Team SiS
Loses a star because SIS to have…
Loses a star because SIS to have stopped doing Banana flavour Rego which is my preferred flavour otherwise fine
July 12, 2026
Reply from Science in Sport (SiS)
Hi there,
We appreciate your feedback and will pass your comments onto our team for review.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi John,
We are so pleased to hear that you were impressed with the speed of our delivery. Thank you for your wonderful feedback!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're happy to hear you found our service good!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Simon,
We're so happy to hear you found our service excellent.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi David,
We appreciate your wonderful feedback! We're so happy to hear you found our service great, easy to deal with, and that you enjoyed our products.
Kind regards
Team SiS
Poor service
I have a subscription for Rest and Recover but it has been out of stock for the last 3 months, I get an email stating my order is about to be dispatched and then a day later I get informed that I am getting a refund as the item is out of stock.
I cancelled my last subscription as the item was continually out of stock!
Very poor show for a company that is supposed to be the best?
July 13, 2026
Reply from Science in Sport (SiS)
Hi Richard,
We sincerely apologize for the ongoing frustration you've experienced with the availability of your Rest and Recover subscription. We understand how disappointing it is to repeatedly receive dispatch notifications followed by out-of-stock refunds, especially after you've already cancelled a previous subscription due to similar issues.
We are actively working to improve our inventory management to prevent these recurring stock problems. We appreciate you bringing this to our attention.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Stephen,
We're so happy to hear you found our service great!!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Greg,
We're so happy to hear you found our service great and that you enjoyed our products.
Kind regards
Team SiS
Using SiS product for long time
Using SiS product for long time, like the taste. Free shipping is also good benefit.
July 11, 2026
Reply from Science in Sport (SiS)
Hi there,
We're so glad to hear you've been a long-time user of our products and enjoy the taste! It's also great to know that you appreciate the free shipping.
Kind regards
Team SiS
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