SiS | Science in Sport | South Africa: Energy Gels, Hydration & Recovery Nutrition

Science in Sport (SiS) is a leading sports nutrition brand that develops scientifically researched products to support energy, hydration, endurance, recovery and overall athletic performance.

SiS products are designed for athletes and active individuals of all abilities, including runners, cyclists, triathletes, football players, gym enthusiasts and anyone looking to fuel training and recovery.

Our GO Isotonic Energy Gels are designed to be taken without water, delivering 22g of fast-acting carbohydrate in an easy-to-digest gel. For longer or harder efforts, BETA Fuel gels use a 1:0.8 maltodextrin-to-fructose ratio to deliver 40g of carbohydrate per gel. Every gel is Informed Sport batch-tested.

Yes. All SiS products carry the Informed Sport certification, meaning every production batch is independently tested for substances prohibited in sport, giving athletes confidence in every serving.

Many SiS products are suitable for vegetarians, and selected products are vegan-friendly. Please check the individual product page or packaging for dietary suitability and allergen information.

Yes. This is the official Science in Sport online store for South Africa, so every product is genuine, correctly stored and supported by our local team.

Yes. Science in Sport products are available nationwide through selected retailers, including Dis-Chem, Sportsmans Warehouse, as well as many leading cycling and running stores across South Africa. You can also shop the full SiS range online through this official South African store, with nationwide delivery direct to your door.

Energy gels are best used before or during exercise lasting longer than an hour. Most athletes take their first gel 20–30 minutes in, then one every 20–40 minutes depending on intensity. Always follow the serving guidelines on the pack.

GO Isotonic gels are ideal for steady fuelling in training and most races. BETA Fuel is built for long or high-intensity events where you need more carbohydrate per hour, such as marathons, long rides and triathlons.

No. The isotonic formulation is designed to be absorbed without additional water. However, maintaining adequate hydration throughout exercise remains important for optimal performance.

Drop one tablet into 500ml of water and let it dissolve. Hydro replaces the electrolytes you lose in sweat with minimal calories, so it's ideal before, during or after exercise and on hot days.

Within about 30 minutes of finishing a hard or long session, when your muscles are most ready to refuel. REGO Rapid Recovery combines carbohydrate and protein to replenish energy and support muscle repair.

GO Energy + Caffeine gels contain 75mg of caffeine per gel, and the GO Caffeine Shot contains 150mg. Check each product page for exact amounts. Caffeine products aren't suitable for children under 16 or pregnant or breastfeeding women, and you shouldn't exceed the daily limit on the pack.

Everyone's gut is different. Try new products in training rather than on race day, and build up gradually, because your gut can be trained to handle more carbohydrate. Our isotonic gels are designed to be easy to digest.

Absolutely. SiS products are suitable for everyday training, race preparation, competitive events and post-exercise recovery, helping you perform at your best whether you're exercising recreationally or competing.

We deliver nationwide, and orders usually arrive within 2–4 working days of being placed. Delivery to major city centres is R99, or free on orders over R1,000. Delivery to outlying areas is R169.

If you're not satisfied with your order, you can cancel within 7 days of receiving it and we'll refund your payment. Returned products must be unopened and in their original condition, with heat seals intact. Return postage is the customer's responsibility. See our Returns page for full details.

You can see all the payment methods we accept on our Payment Methods page.

Best Before specials are genuine SiS products that are close to their best-before date, which we choose to offer at a discount. A best-before date is a guide to peak quality rather than safety, so these products are still good to use. For the best experience, enjoy them soon after purchase.