Science in Sport (SiS) (www.scienceinsport.com) has a 4.2 out of 5 rating on OK.one, based on 201 user reviews collected here. It is listed under Sports and its reputation is good. 78% of reviews are 4 stars or higher and 14% are 1 star; The business has replied to 85% of negative reviews. Last updated 2026-08-10.
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.
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, 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
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
best service ever, broken box was replaced within 24h
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, and also a prompt delivery.
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
I really enjoy the recovery drink following a hard bike ride as well as after a gym session. I feel it helps recover for the following day.
Hi there, We're so pleased to hear that our recovery drink is helping you after your bike rides and gym sessions. It's great to know it aids your recovery for the next day! Kind regards Team SiS
Hi there, We appreciate your positive feedback. Kind regards Team SiS
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
Hi Keith, We appreciate you sharing your experience. Kind regards Team SiS
Product is good. Website works well. Evri is awful. Please provide options for other courier
Hi Dave, We appreciate your feedback. We apologise for the inconvenience caused with delivery courier, and will review this internally. Kind regards Team SiS
Usual top quality products and back to quick delivery now switched to dhl 👍🏻
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
Easy seamless transaction and quick delivery
Hi Luke, We appreciate your positive feedback. We are happy you found your transaction easy and delivery quick. Kind regards Team SiS
Sound product, delivered promptly (just before a 70.3 Ironman race), thank you!
Hi James, We're so glad the product arrived promptly for your Ironman! We wish you the best of luck. Kind regards Team SiS
Super quick delivery - great work
Hi there, We're glad you enjoyed our quick delivery! Thank you for your feedback. Kind regards Team SiS
Easy to order. Quick delivery. Brilliant product.
Hi Lesley, We're delighted you enjoyed your experience. Thank you for your kind words! Kind regards Team SiS
The product is great, but the communication about the delivery process can definitely improve
Hi Antonio, We're glad you like our product! We'll improve our delivery communication. Thank you for your feedback. Kind regards Team SiS
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
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 loves the strawberry protein shakes.
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) I hope that soon we'll be able to sign up for products that are currently unavailable again)
Hi there, We are very happy to know everything was satisfactory this time. We truly appreciate your positive feedback. Kind regards Team SiS
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!
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
Great product and very efficient, quick delivery, with good communications following order placement
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
Hi Jon, We appreciate your kind words. We are so glad you had a great experience with us. Kind regards Team SiS
201 reviews matching