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.
The support team (Beth) is the best. Ordering is fast and good.
Hi Chris, We are so pleased to hear that your ordering experience was fast and good. We're especially delighted to know that Beth provided you with excellent service. Thank you for your wonderful feedback! Kind regards Team SiS
Hi George, We appreciate your positive feedback and are so glad you had a great experience with our fast delivery and high-quality products. Kind regards Team SiS
Excellent service again for the delivery and bakes product I have on subscription. Can recommend SIS Products.
Hi Nigel, We are so happy to hear you are consistently pleased with our delivery service and baked products! We appreciate your kind recommendation. Kind regards Team SiS
Hi there, We appreciate your feedback regarding our service and delivery. We are always working to improve our processes. Kind regards Team SiS
Order not shipped. Bad customer service. Will never order again.
Hi there, We are truly sorry your order was not shipped. We are reviewing this internally to prevent future occurrences. We can see that the order has been refunded for you. Kind regards Team SiS
It's all very well you considering the matter "closed" - as the consumer I don't because I have one of YOUR water bottles that is faulty. If YOU are not prepared to replace it (only to suggest I go through the pain of an Amazon return) then you can continue to enjoy my negative reviews. It would seem such a simple (and reasonable) act on your part to do the "right thing", but your arrogance persists .... as will the negative reviews.
I still not received these and have had to buy replacements while waiting, I’m currently training and in need of these
Hi Jamie, We regret the delay in receiving your items, especially given your training needs. We can see that a member of our team has already replaced the order for you yesterday. Kind regards Team SiS
Restocking products - order was quickly fulfilled and delivered. Free water bottled arrived as promised.
Hi there, We're delighted to hear that your order was fulfilled and delivered quickly! It's great to know that you received your free water bottle as promised. Kind regards Team SiS
Great to have subscriptions. Easy for shoppers
Hi there, We're so glad to hear that our subscription service makes shopping easier for you. Thank you for your positive feedback! Kind regards Team SiS
The company (SiS) acknowledged that a delivery mistake had been made (ie I never received my parcel) and said they would let the delivery company (Evri) know. Although they did not accept responsibility (they chose the delivery company!) and they also had misunderstood my missing delivery as a cheaper product and it was this cheaper product that they replaced!! AND, the delivery company STILL DID NOT FOLLOW MY DIRECTIONS and so delivered to the same place my delivery had gone 'missing' from!!!! Words escape me for the absolute poor customer care - but it is what we have to put up with now!! BUT SHOULD WE??? This is a reply to SiS's comment. It seems this website cannot add a response below the company's comments! To SiS - what is the point of responding to you when you tacitly state there is nothing you will do to ensure deliveries' are made to customers safe areas. The ONLY solution you have arrived at is that I change the delivery address! It is more than frustrating.
Hi Richard, Thank you for taking the time to share your feedback. We're very sorry to hear about your experience. Having reviewed the case, we can see that the original replacement was issued based on the order number provided to us at the time. Unfortunately, this related to a different, lower-value order than the one you were referring to. Once this was identified, we arranged for the correct order to be resent. We also raised your delivery concerns with Evri and passed on the delivery instructions you had provided. However, as the delivery process is managed by the courier, we are unable to guarantee that specific instructions will always be followed which was also addressed in our emails. In addition to resending the correct order, we refunded the missing product and suggested redirecting future deliveries to an alternative location if parcels were not being successfully delivered to the original address. Unfortunately, we did not receive a response to this suggestion. We appreciate that this situation has been frustrating, and while we did everything we could to resolve the issue once it was brought to our attention, we're sorry that the outcome did not meet your expectations. Kind regards, Team SiS
I find SIS have very good options of different products that help with the sports you are doing and there products are very well made and are very low in sugar what I find very helpful as I'm a type 1 Diabetic and find when using them my sugars don't go high and when you put in a order they are delivered within a couple of day of you ordering
Hi there, We are so pleased to hear that our product options are beneficial for your sports activities and that the low sugar content helps manage your Type 1 Diabetes effectively. Thank you for sharing your experience! Kind regards Team SiS
The delivery did not arrive 2 weeks after order
Hi Oliver, We are truly sorry to hear you are still awaiting your product. We are looking into this delivery delay for you and will follow up with you shortly. Kind regards Team SiS
Super service. The products I ordered were with me within 24 hours without any drama!!
Hi James, We appreciate your positive feedback! We're happy to hear you received your products so quickly and without any issues. Kind regards Team SiS
I use SiS products for quite some time both for energy boost during my trainings as well as for recovery. Really great products. Also their support is excellent when ever there's a problem with the shipment. I always get immediate and efficient support.
Hi there, We truly appreciate you taking the time to share your positive experience with our products and support. I We're delighted that our support team has been able to assist you efficiently whenever needed. Kind regards Team SiS
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.
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
I can not though them as it all works so well
Hi there, We're so glad to hear everything is working well for you! We truly appreciate your wonderful feedback. Kind regards Team SiS
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
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
Good product perfectly times with a subscription & very welcome extras on some deliveries which fuel my Ultras!!
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
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
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.
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
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