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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Enhanced experience
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. Also reading your articles on website has allowed me to tweek how best to use products and when, to maximum advantage.
11 July 2026
Reply from Science in Sport (SiS)
Hi David,
We are so glad to hear our products have helped you in this way! We are also happy our articles have provided valuable insights for optimizing product use.
Thank you for sharing your positive experience with us.
Kind regards
Team SiS
Marathon performance
As a marathon runner fuel works well for me before and afrer training and supplements to keep me healthy throughout the year.
Good valuable imformation on how to feul throughout events also.
Im getting more competitive in the over 45s as a marathon runner aproaching the 2h40min target.
10 July 2026
Reply from Science in Sport (SiS)
Hi George,
We're so happy to hear our fuel and supplements are helping you excel in your marathon training and competitive goals.
We wish you the best in achieving your 2h40min target!
Kind regards
Team SiS
I still haven't received my order
It is, in fact, the worst service ever. Terrible. I don't advise anyone to buy SIS online.
It's been 10 days since the order stopped, with no delivery forecast. They kept the money and don't want to refund it. Shameful. The experience started badly right away when I was informed that they hadn't sent the order because the address was too long...if I hadn't questioned the delay, they would have remained silent!!!!
7 July 2026
Reply from Science in Sport (SiS)
Hi Oscar,
Thanks for sharing your review. As mentioned via email, the address entered at payment was too long which caused some issues with processing. We addressed this with you, amended this, and dispatched the order again for you this week.
Please note that tracking updates may pause while the parcel is travelling between countries, as there are no scan events during this stage of the journey. Updates will resume once the parcel reaches the destination country and is processed by the local delivery network.
Based on the current tracking information, your order is expected to be delivered within the next few days.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Marie,
Thank you so much for your wonderful feedback!
We are thrilled to hear that you had such a positive experience with both our product and our service. We truly appreciate your kind words.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
Thank you for taking the time to share your positive feedback. We are delighted to hear that you are pleased with our products and the delivery service.
Kind regards
Team SiS
Service is always very good
10 July 2026
Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear that you consistently receive excellent service from us! Your positive feedback means a lot to our team.
Thank you for sharing your experience.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're delighted you enjoyed our products and service! Thank you for your wonderful feedback.
Kind regards
Team SiS
Good customer service
I had a problem with ordering but the customer service was amazing and quickly resolved my issue.
However, my parcel was delivered days after the expected date I was told, which meant I was unable to take my gels and energy chews with me to a major competition which is a real shame and I know this is probably the fault of the delivery company rather than SiS.
9 July 2026
Reply from Science in Sport (SiS)
Hi there,
We are glad our customer service team could assist you with your order. We understand your frustration regarding the delayed delivery and the impact it had on your competition preparations.
We are always working to improve our delivery processes and appreciate your feedback.
Kind regards
Team SiS
Definitely feel that it helps me
Definitely feel that it helps me, is easy to mix and I enjoy the taste too.
6 July 2026
Reply from Science in Sport (SiS)
Hi Steve,
We're delighted to hear that you find our product helpful and easy to prepare. It's wonderful to know that you also enjoy the taste! Thank you for sharing your positive experience.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Stuart,
We're glad that you enjoy our products!
Kind regards
Team SiS
Fast efficient service
Fast efficient service, easy ordering and subscription service.
Great products too.
7 July 2026
Reply from Science in Sport (SiS)
Hi Linda,
We're so pleased to hear that you found our service fast and efficient, and that our ordering and subscription process was easy for you.
We're also delighted that you enjoy our products!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Sam,
We're so happy to hear you're enjoying the water bottles and appreciate your kind words about our quick shipping! We're glad they're a part of your daily routine.
Kind regards
Team SiS
I ordered a next day delivery and it…
I ordered a next day delivery and it took nearly 7 working days to arrive.
6 July 2026
Reply from Science in Sport (SiS)
Hi Thomas,
We sincerely regret the significant delay in your delivery. We are actively investigating this issue to prevent future occurrences.
Kind regards
Team SiS
Subscription service is fine but it’d…
Subscription service is fine but it’d be great if it could reflect my quantity usage and also be able to consolidate deliveries
6 July 2026
Reply from Science in Sport (SiS)
Hi there,
We appreciate your feedback on our subscription service. We understand your desire for usage-based quantity reflection and consolidated deliveries.
We are always looking for ways to improve our services and will certainly consider these suggestions.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Tom,
We are so pleased to hear that you experienced such prompt dispatch and delivery.
Thank you for taking the time to share your positive feedback with us.
Kind regards
Team SiS
One box of gel has been damages during…
One box of gel has been damages during the supply, one of the gels stick arrived cut open and leaked all over the box.
Pitty but SIS products remain my favorite
26 June 2026
Reply from Science in Sport (SiS)
Hi there,
We are truly sorry to hear about the damaged gel box and the leaked product. Unfortunately as this is the first time we've heard of this issue, we haven't been able to resolve this for you.
While we appreciate your feedback, we always encourage customers to contact our Customer Service team before leaving a review.
A member of our team will be in touch shortly.
Kind regards
Team SiS
Creepy
After ten days mail arrived to leave a review. Unfortunately I did not get any update yet from the store, I just paid and got confirmation, then nothing for ten days. I believe it will finaly arrive, but this is a second time same experience, so I wouldn’t recommend to shop there, they’re getting worse and worse…
4 July 2026
Reply from Science in Sport (SiS)
Hi Lukas,
We appreciate you sharing your experience and feedback regarding the delay in receiving updates on your order.
We'll contact you personally to look into the matter further.
Kind regards,
Team SiS
Worst Delivery & Zero Support. Avoid!
Absolutely terrible experience. I ordered from SIS Sport specifically for my training prep, and it has been a total disaster.
First of all, I still haven’t received my order. They claim they tried to deliver, but nobody ever came to my house, and they never called me. I’ve been stuck waiting around for nothing, and because of their complete failure to deliver, I’ve had to miss my scheduled training sessions.
To make matters worse, their customer support is utterly useless. I contacted them to resolve this, and they did absolutely nothing to fix the issue. When I requested a refund for the delivery costs—considering they failed to actually deliver anything—they completely ignored my request.
Unprofessional, unreliable, and terrible customer service. If you actually need your sports nutrition/gear on time for your training, do yourself a favor and buy from someone else. I want my money back. The 14/07/2026 Italy. No delivery till today
4 July 2026
Reply from Science in Sport (SiS)
Hi Aymen,
Thank you for your feedback. We're sorry to hear that you feel disappointed with your experience.
To provide some context, you first contacted us two days after placing your order, at which point we provided the tracking information and advised of the 5–7 working day delivery timeframe for deliveries to Italy, as stated on our website.
You subsequently requested that the courier contact you before delivery. We explained that we could pass this request on, but unfortunately we cannot guarantee that a courier will call before attempting delivery, as this is not standard practice unless there is an issue with the delivery.
When you contacted us again requesting a refund, we reviewed the tracking and could see that the courier had recorded failed delivery attempts. We provided the tracking details again, advised that a further delivery attempt would be made, and explained that as the parcel was still within the estimated delivery timeframe, we were unable to issue a refund at that stage.
We would also like to clarify that none of your emails have been ignored. We have responded throughout, explained the situation as updates became available, and provided contact details for the local depot should you wish to discuss delivery arrangements directly with the courier.
Following our latest review today, we have refunded your delivery charge as a gesture of goodwill. As there has still been no further tracking update, we have also offered either a replacement order or a full refund, depending on your preference.
We apologise for the inconvenience caused and remain happy to assist in resolving this matter.
Kind regards
Team SiS
I have been using science in sport over…
I have been using science in sport over a large period of time now. This brand supports me in my training therefore is my no. 1 go to brand in terms of fuelling.
4 July 2026
Reply from Science in Sport (SiS)
Hi Michael,
We're so glad to hear that our brand consistently supports your training and remains your top choice for fuelling. We truly appreciate your loyalty and positive feedback!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Gareth,
We're so glad to hear that our products are gentle and effective for you. Thank you for your wonderful feedback!
Kind regards
Team SiS
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