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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Review summary
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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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This product and company are my go to…
This product and company are my go to for marathon gels, neutral is my favorite as i don’t like the flavors. Only negative about this company is I have no idea how to add products to a order when I’m also re upping a subscription
June 20, 2026
Reply from Science in Sport (SiS)
Hi Daniel,
We're so happy to hear our marathon gels are your go-to, especially the neutral flavour!
We understand your frustration regarding adding products to an existing subscription order, as mentioned within our Help Centre, this is not something we offer at the moment. Apologies.
Your feedback is truly helpful as we strive to enhance our services.
Kind regards
Team SiS
Quick delivery
Quick delivery, Great Products. Had a problem with my 1st order but they more than made up for that. Will order again in a few weeks.
June 17, 2026
Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear you're pleased with our products and delivery!
We appreciate you acknowledging how we resolved your initial concern.
Kind regards
Team SiS
Good product perfectly times with a…
Good product perfectly times with a subscription & very welcome extras on some deliveries which fuel my Ultras!!
June 16, 2026
Reply from Science in Sport (SiS)
Hi there,
We are so pleased to hear that our product and subscription service are perfectly timed for your needs, and that the extras are fuelling your Ultras!
Thank you for your wonderful feedback.
Kind regards
Team SiS
Faulty Water Bottle and Replacement
I had a faulty water bottle and contacted SIS. Beth helped me and with proof of purchase is sending me a replacement. Thank you Beth and SIS for your great help and customer experience.
June 27, 2026
Unprompted review
Reply from Science in Sport (SiS)
Hi Toby,
We are so glad to hear that we could assist you with your water bottle and that our team provided a great customer experience.
We appreciate your kind words!
Kind regards
Team SiS
After an order placed
After an order placed, I only received half of my order even though I was charged for all of it. I'm claiming my second product. Looking forward to this reception
June 18, 2026
Reply from Science in Sport (SiS)
Hi there,
We sincerely apologize for the incomplete order. We can see that a replacement has been issued via our team and that this has already been dispatched.
Kind regards
Team SiS
Great an responsive
Great an responsive. Support was helpful and fast. Even though my first order was not registered correctly I spoke with support and the issue was resolved and got my package. Ordered a second time after with no issues at all.
June 16, 2026
Reply from Science in Sport (SiS)
Hi there,
We are so happy to hear that our support team was able to quickly resolve the issue with your first order and that you received your package.
We appreciate you giving us another chance, and we are glad your second order went smoothly. Thank you for your kind words!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Hannah,
We are so glad to hear that our recovery solution has been the best you've purchased! We appreciate your positive feedback.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear we could resolve the issue with your box quickly. We appreciate your kind words!
Kind regards
Team SiS
Excellent guidance through purchase
Excellent guidance through purchase, and also a prompt delivery.
June 17, 2026
Reply from Science in Sport (SiS)
Hi Sean,
We're so glad to hear you found our purchase guidance excellent and that your delivery was prompt. Thank you for your positive feedback!
Kind regards
Team SiS
Consistency Matters
June 14, 2026
Reply from Science in Sport (SiS)
Hi there,
We appreciate your positive feedback.
Kind regards
Team SiS
Evri is awful
Product is good. Website works well. Evri is awful. Please provide options for other courier
June 15, 2026
Reply from Science in Sport (SiS)
Hi Dave,
We appreciate your feedback. We apologise for the inconvenience caused with delivery courier, and will review this internally.
Kind regards
Team SiS
Faster delivery than expected
Faster delivery than expected. However I was disappointed to not receive what I expected. I thought I had ordered the 75mg caffeine gels and received the 150 mg. I now have a glut of them. Going back to the product page I find that the mg changes with the flavour and I didn’t notice. I now will have to place another order when finances allow. Regards Keith
June 13, 2026
Reply from Science in Sport (SiS)
Hi Keith,
We appreciate you sharing your experience.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Luke,
We appreciate your positive feedback. We are happy you found your transaction easy and delivery quick.
Kind regards
Team SiS
Usual top quality products and back to…
Usual top quality products and back to quick delivery now switched to dhl 👍🏻
June 14, 2026
Reply from Science in Sport (SiS)
Hi there,
We're so glad you're happy with our products and the quick delivery. Thank you for your wonderful feedback!
Kind regards
Team SiS
Sound product/prompt delivery
Sound product, delivered promptly (just before a 70.3 Ironman race), thank you!
June 13, 2026
Reply from Science in Sport (SiS)
Hi James,
We're so glad the product arrived promptly for your Ironman! We wish you the best of luck.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Lesley,
We're delighted you enjoyed your experience. Thank you for your kind words!
Kind regards
Team SiS
The product is great
The product is great, but the communication about the delivery process can definitely improve
June 10, 2026
Reply from Science in Sport (SiS)
Hi Antonio,
We're glad you like our product! We'll improve our delivery communication. Thank you for your feedback.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're glad you enjoyed our quick delivery! Thank you for your feedback.
Kind regards
Team SiS
Terrible experience attempting place…
Terrible experience attempting place online order as a new customer.
I was told that my email account with a highly secure, credible Swiss organisation is banned and blocked and therefore they wouldn’t accept any of my orders unless I changed to a less secure email service. How stupid and poor of SiS
June 11, 2026
Reply from Science in Sport (SiS)
Hi Peter,
We're sorry to hear about your experience. Our payment provider uses automated fraud-prevention checks which can sometimes result in orders being declined due to certain email addresses. Unfortunately, this decision is outside of our direct control.
We appreciate how frustrating this can be and apologise for the inconvenience caused.
Kind regards,
Team SiS
Always prompt delivery and my daughter…
Always prompt delivery and my daughter loves the strawberry protein shakes.
June 9, 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
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