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
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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Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear that your delivery was smooth and without any issues. We appreciate your positive feedback.
Kind regards
Team SiS
SIS have a great choice of products
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 slightly shorter practice run we relied on energy bars & struggled with fatigue towards the end. For the actual ride we used SIS gels and beta fuel. The difference was phenomenal. Apart from creaking knees I felt as fresh and fit as I did when I set off. SIS fuels work 100%
July 20, 2026
Reply from Science in Sport (SiS)
Hi there,
We're so glad to hear our products made such a significant difference in your sponsored ride!
We truly appreciate you sharing your positive experience with us.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Stan,
We appreciate your positive feedback and are so glad you had a great experience with our fast delivery and great products.
Kind regards
Team SiS
Some bathes not dissolving as easily as others
There seems to be a problem with some batches not dissolving as easily as others, this leaves a powdery taste in the mouth which is not pleasant
July 20, 2026
Reply from Science in Sport (SiS)
Hi Stan,
We appreciate you sharing your experience with us. We are concerned to hear about the dissolving issues and the powdery taste.
Please reach out to our support team, and they'll be happy to look into this with you.
Kind regards
Team SiS
Late delivery …
The products are excellent however delivery company is questionable. Order did eventually turn up.
July 21, 2026
Reply from Science in Sport (SiS)
Hi Allan,
We appreciate your feedback on our products. We are concerned to hear about the delivery experience and are reviewing our courier partners to prevent future issues.
Kind regards
Team SiS
The product is Ronseal
July 21, 2026
Reply from Science in Sport (SiS)
Hi there,
We appreciate you taking the time to share your feedback with us.
Kind regards
Team SiS
Usually good experience overall but I…
Usually good experience overall but I don’t get the part about not able to cancel my subscription after first delivery when I figured out the product is not working well for me
January 12, 2026
Reply from Science in Sport (SiS)
Hi there,
Thanks for your review.
We're sorry to hear the product wasn't the right fit for you.
Our subscription terms do require a minimum of two orders before cancellation is available. This information is outlined on the subscription page prior to sign-up and is also detailed within our Terms & Conditions.
We appreciate your feedback and thank you for giving the product a try.
Kind regards,
Team SiS
Ordine effettuato il 18/7/2026
Ordine effettuato il 18/7/2026, ad oggi 31/07/2026 non mi è stato ancora consegnato e non è la prima volta che succede con il corriere DPD - BRT.
Tale servizio è veramente PESSIMO.
I plased my order on 18/7/2026, 13 days passed by and it hasn.t been delivered yet.
It's not the first time with DPD - BRT which is a VERY POOR courier to say the least!
July 18, 2026
Reply from Science in Sport (SiS)
Hi there,
We sincerely regret the significant delay in the delivery of your order and the frustration this has caused. We understand your disappointment, especially as this is a recurring issue with the courier.
We are actively reviewing our delivery processes and courier partnerships to prevent such experiences in the future. We can see that your order is due for delivery within the next 24 hours.
We appreciate you bringing this to our attention.
Kind regards
Team SiS
Very professional and helpful support!
July 18, 2026
Reply from Science in Sport (SiS)
Hi there,
We are so glad to hear that you had a great experience with us!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We are very sorry your order was not received. We are investigating this issue and will follow up shortly.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Valerie,
We're so pleased to hear that your order arrived on time and that you experienced great communication. We're especially happy you love our products! Thank you for your amazing feedback.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Howard,
Thank you for your wonderful feedback! We are so pleased to hear that you are enjoying our products and experienced excellent service.
Kind regards
Team SiS
My order was cancelled due to product…
My order was cancelled due to product being out of stock but there was no follow up with an offer of a replacement order or when the product would be back in stock. This was supposed to be an automatic subscription
July 20, 2026
Reply from Science in Sport (SiS)
Hi there,
Thank you for sharing your feedback. We sincerely apologize for the inconvenience and frustration caused by the cancellation of your subscription order due to an out-of-stock item, and for the lack of follow-up regarding a replacement or restock date.
We understand how disappointing this must be, especially for an automatic subscription.
We are truly sorry for this oversight and for not meeting your expectations.
Kind regards
Team SiS
Great service thank you
July 17, 2026
Reply from Science in Sport (SiS)
Hi Rod,
We are so glad to hear that you had a great experience with our service. Thank you for your kind words.
Kind regards
Team SiS
Great product
July 19, 2026
Reply from Science in Sport (SiS)
Hi there,
We are so glad to hear that you had a great experience with our products. Thank you for your kind words.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Ed,
We're so pleased to hear that you found the ordering process easy and that our beta fuel consistently meets your expectations!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're so pleased to hear that you found the ordering process straightforward and that your item arrived quickly. Thank you for sharing your positive experience!
Kind regards
Team SiS
Great experience working with SIS
Great experience working with SIS. Our order arrived before race day, communication was excellent throughout the process, and they provided samples for our team to try beforehand. The feedback was very positive, and the athletes found the Nitrate shot beneficial.
July 17, 2026
Reply from Science in Sport (SiS)
Hi there,
We're so pleased to hear about your positive experience with us! It's fantastic that your order arrived on time and that the communication was excellent throughout.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're so pleased to hear you found our product great, the ordering process easy, and that it arrived quickly! Thank you for your wonderful feedback.
Kind regards
Team SiS
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
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