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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Used for over a year for work and…
Used for over a year for work and training on he bike.
30 June 2026
Reply from Science in Sport (SiS)
Hi there,
We're glad to hear our product has been a consistent part of your work and training routine for over a year. We appreciate your feedback.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear you enjoyed our service and found it to be fast. We appreciate your positive feedback!
Kind regards
Team SiS
Best rocket fuel ever made
1 July 2026
Reply from Science in Sport (SiS)
Hi Peter,
We're absolutely thrilled you enjoyed our product so much! Your positive feedback truly means a lot to us.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're glad you enjoyed our product so much! Your positive feedback truly means a lot to us.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Stephen,
We're so happy to hear you consistently receive excellent service! We truly appreciate your wonderful 5-star feedback.
Kind regards
Team SiS
Missing order and disappointing customer service
I placed my order on June 28, with an estimated delivery date between July 1 and July 3. Apart from the initial order confirmation, I never received any further updates.
Since there is no customer service phone number, I had to contact support through the chatbot and email. Despite their claim that they reply within 24 hours, I received my first response after more than 24 hours. After several emails back and forth, it became clear that my order had most likely been lost, as there was no record of it ever being dispatched.
On July 7, customer service told me they would send a replacement order via express delivery. Today is July 13, and I still haven’t received anything. I have not been sent a tracking number or any confirmation that the replacement order has even been shipped.
Overall, this has been a very disappointing experience. The communication was slow and frustrating, and I was left without any proactive updates. We’ll see how this eventually turns out, but so far my experience has been very poor.
7 July 2026
Unprompted review
Reply from Science in Sport (SiS)
Hi Matej,
We are truly sorry to hear about the experience you've had with your recent order. We understand your disappointment regarding the lack of updates, and the delay with the express delivery for your replacement order.
We can see that your enquiries have been responded to by our team and a resolution was provided yesterday.
If we can help with anything further, please feel welcome o respond to the email chain and we'll be happy to help further.
Kind regards
Team SiS
Trusted science
Friendly. Human. Researched. Efficient. Thank you! I have stage 4 lung cancer and am a cyclist. I need products I can trust.
1 July 2026
Reply from Science in Sport (SiS)
Hi there,
We are so glad our products meet your needs. We truly appreciate your trust in us. We wish you strength and continued joy in cycling.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Colin,
We appreciate your kind words and are so pleased to hear that your item arrived quickly and was well-packaged.
We are glad you had a great experience.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Karen,
We're so happy to hear that you're pleased with our product, quick delivery, and good prices. Thank you for your wonderful feedback!
Kind regards
Team SiS
I've moved from an assortment of…
I've moved from an assortment of nutrition and energy products to totally SIS. SIS works best for me than any other product.
9 July 2026
Reply from Science in Sport (SiS)
Hi Tommy,
We are so happy to hear that our products have become your go-to for nutrition and energy! It's wonderful to know they work best for you.
Kind regards
Team SiS
I like being able to order direct from…
I like being able to order direct from SIS, as I can then choose from your full range
2 July 2026
Reply from Science in Sport (SiS)
Hi Robin,
We're so pleased to hear you appreciate the ability to explore our complete product selection directly. Thank you for your kind words!
Kind regards
Team SiS
Terrible
Terrible - no service 2 weeks after payment and I still haven't received anything, not even shipping information - waybill number, status... NOTHING.. No one answers the emails I wrote 2!
29 June 2026
Reply from Science in Sport (SiS)
Hi there,
We sincerely apologize for the significant delay and lack of communication regarding your order. We understand your frustration with not receiving shipping information.
We can see that a member of our team has been in touch and your enquiry has been resolved. If we can help with anything else, please feel welcome to respond to the email chain and we'll be happy to help further.
Kind regards
Team SiS
Sis were fantastic my order arrived…
Sis were fantastic my order arrived damaged as a result of the courier.sis had a replacement sent out straight away.a true test of a company isn't whem things go right it's how they fix them when it goes wrong.10 out of 10
10 July 2026
Unprompted review
Reply from Science in Sport (SiS)
Hi there,
We're truly sorry to hear that your order arrived damaged, but we're so glad we could swiftly send out a replacement for you. We appreciate you recognizing our efforts to resolve issues when they arise. Thank you for your kind words!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Paul.
At this time, our Customer Service team is available exclusively through Live Chat, Email, or our Contact Form. We do not operate a customer service phone line.
This is detailed within our Help Centre.
A member of the team will follow up with you shortly.
Kind regards
Team SiS
Dear Team,
Dear Team,
I placed my order in June, and as of today, I have still not received it. This delay is far longer than expected and is unacceptable.
I am very disappointed with the level of service and would appreciate an immediate update on my order and its expected delivery date.
I look forward to your prompt response.
Kind regards,
Ibrahim Alharami
11 June 2026
Reply from Science in Sport (SiS)
Hi there,
We sincerely regret the extended delay in receiving your order placed in June. We understand your frustration and disappointment with the service experience.
We are actively investigating the status of your shipment and will provide an update shortly, our team will be in touch shortly.
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi there,
We're so happy to hear that your delivery was quick and that the product description was accurate. Thank you for your positive feedback!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Mike,
We appreciate your feedback! We're so happy to hear you had a great experience with our service and enjoyed our tasty product.
Thank you for your continued support!
Kind regards
Team SiS
Placed order and received next day
Placed order and received next day. First rate service
27 June 2026
Reply from Science in Sport (SiS)
Hi there,
We're so pleased to hear that your order arrived promptly and that you experienced our first-rate service.
Thank you for your kind words!
Kind regards
Team SiS
Reply from Science in Sport (SiS)
Hi Don,
We're so happy to hear that your delivery was immediate and that you continue to enjoy our excellent products. Thank you for your feedback!
Kind regards
Team SiS
Great product - poor delivery
Great product, poor delivery. Product ordered on 27 June, finally delivered on 7 July! Lost by courier and may never have turned up had I not chased - a replacement was sent on "express" delivery on 3 July - it is that which arrived today 7 July nowhere near the next working day service advertised on website to UK mainland. (they appear to include Saturday and Sunday as working days on website)
Well done to Beth for sorting issue.
Not well done for Evri.
27 June 2026
Reply from Science in Sport (SiS)
Hi there,
We appreciate you taking the time to share your experience with us. We are truly sorry to hear about the significant delay and the issues you encountered with the delivery of your order.
We are glad that Beth was able to assist you, and we are actively reviewing our courier services to prevent similar situations in the future.
Kind regards
Team SiS
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