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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Always prompt delivery and my daughter…
Always prompt delivery and my daughter loves the strawberry protein shakes.
9 June 2026
Reply from Science in Sport (SiS)
Hi there,
We're so glad to hear about your prompt deliveries and that your daughter loves our strawberry protein shakes!
Kind regards
Team SiS
This time all ok)
This time all ok)
I hope that soon we'll be able to sign up for products that are currently unavailable again)
10 June 2026
Reply from Science in Sport (SiS)
Hi there,
We are very happy to know everything was satisfactory this time. We truly appreciate your positive feedback.
Kind regards
Team SiS
Great to get electrolyte drink so quickly!
Your product is great and it came almost within the promised timeframe. It wasn't totally necessary, but it would have been nice to get a receipt with tracking information. I am feeling recharged now!
7 June 2026
Reply from Science in Sport (SiS)
Hi Tim,
We are so glad to hear our product is great and you're feeling recharged!
We appreciate your feedback regarding tracking information. We will consider this for future improvements.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Jon,
We appreciate your kind words. We are so glad you had a great experience with us.
Kind regards
Team SiS
Great products. Great Service... Standard
Can't fault the service or the products at SiS. As others have mentioned, the opening for the Creatine is very small so most will struggle to get their hand in. I have decanted it into a container.
Otherwise, fantastic service and products !!
9 June 2026
Reply from Science in Sport (SiS)
Hi David,
We're so happy to hear you're pleased with our service and products!
We appreciate your feedback regarding the creatine container opening and will certainly consider it for future improvements.
Thank you for your support!
Kind regards
Team SiS
Great product and very efficient
Great product and very efficient, quick delivery, with good communications following order placement
9 June 2026
Reply from Science in Sport (SiS)
Hi there,
We're so glad you found our product great and appreciated the efficient, quick delivery and good communication. Thank you!
Kind regards
Team SiS
Quick delivery
Easy website, quick delivery. Alternative available when ordered stock not available.
Improvement could with updating website to inform that stock is unavailable. General discount on order size would be preferred to race packs that are not personalised.
8 June 2026
Reply from Science in Sport (SiS)
Hi there,
We appreciate your feedback on our website and delivery. We are working to improve our stock updates and will consider your suggestions regarding discounts.
Kind regards
Team SiS
The very best quality products that I…
The very best quality products that I have been using for years.
Always amazing prompt customer support when needed.
Good discounts for longevity.
8 June 2026
Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear you've consistently enjoyed our products and customer support over the years.
Thank you for your wonderful feedback!
Kind regards
Team SiS
Use then when cycling and work when…
Use then when cycling and work when hot. Excellent.Quick delivery and good prive
8 June 2026
Reply from Science in Sport (SiS)
Hi Neil,
We're so glad you found our product excellent for cycling and hot weather!
We appreciate your positive feedback.
Kind regards
Team SiS
I recently wrote to SIS to explain…
I recently wrote to SIS to explain this. I recently bought a box of Beta Carb sachets and when they arrived a number of the sachets were split and the box was full of powder. Which is annoying.
I didn’t see any indication that this was caused in transit. Packaging was in good condition and adequate.
7 June 2026
Reply from Science in Sport (SiS)
Hello Simon,
A member of our team was in touch yesterday following your initial query, we haven't yet heard back from you.
If you could please get back to our team, we'd be more than happy to help with this.
Kind regards
Team SiS
Placed order and received items well
Placed order and received items well packed and all in good order. Great Service
8 June 2026
Reply from Science in Sport (SiS)
Hi Seymour,
We appreciate your feedback regarding your order and the invoicing process. As mentioned, sadly we did not receive initial queries as they were sent to an automated inbox.
We're happy to have now provided your invoice :)
Kind regards
Team SiS
I recently contacted SiS
I recently contacted SiS regarding an issue I experienced with one of their electrolyte products. From the moment they responded, their customer service was exceptional. They took my concerns seriously, involved their Quality team, and kept me informed throughout the process. A huge thank you to Kam and the team for their excellent customer service. It's refreshing to see a company stand behind its products and genuinely care about its customers. We will continue to use and recommend SiS products with confidence.
17 June 2026
Unprompted review
Reply from Science in Sport (SiS)
Hi there,
We are so pleased to hear about your positive experience with Kam. It is wonderful to know that we could address your concerns effectively and keep you informed. Your confidence in our products and your recommendation mean a great deal to us.
Kind regards
Team SiS
Ordered online
Ordered online, and never received anything. No tracking number, no response when I emailed about the status of the order, nothing!
Then they ask me to review my experience!
Well this is it.
4 June 2026
Reply from Science in Sport (SiS)
Hi Kevin,
Thanks for your feedback. We can see that a member of our team responded to your enquiry and this was resolved yesterday with a replacement.
If we can help with anything further, please let us know and we'll be happy to help.
Kind regards
Team SiS
How can you cancel an order (made in…
How can you cancel an order (made in advance by subscription) due to insufficient stock and not offer any automatic alternative flavours. I'll stock up on milk and add some banana in future.
5 June 2026
Reply from Science in Sport (SiS)
Hi there,
We understand your frustration regarding the cancelled subscription order due to stock issues and the lack of automatic alternatives.
We are reviewing our process for such situations and apologise for the inconvenience.
Kind regards
Team SiS
I still have not received part of my…
I still have not received part of my order due to "picking error" I was told. I did receive tracking or shipping information at all for any of it.
4 June 2026
Reply from Science in Sport (SiS)
Hi David,
Thank you for reaching out. We apologize for the frustration regarding your missing items and the lack of communication.
We can see that a member of our team was in touch on Saturday and issued a replacement right away. This was dispatched yesterday.
We'll follow up with tracking details shortly.
Kind regards
Team SiS
solid service
5 June 2026
Reply from Science in Sport (SiS)
Hi there,
We're glad you enjoyed your experience. We appreciate your feedback.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're glad you enjoyed your experience. We appreciate your positive feedback.
Kind regards
Team SiS
Rego recovery shake vegan strawberry…
Rego recovery shake vegan strawberry flavour works great after tough cycling 💪 or big nights out🍻 😀 it mixes easily in a shaker with water sometimes I mix water and milk at bedtime to slow absorbtion.
Good price and Rapid delivery
1 June 2026
Reply from Science in Sport (SiS)
Hi there,
We are so pleased to hear you're enjoying the strawberry Rego recovery shake and finding it effective after your activities! We appreciate your positive feedback.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi James,
Thanks for your feedback. We're glad you appreciate our product.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Becky,
We appreciate your review. We are so glad you are enjoying our products and customer service.
Kind regards
Team SiS
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