20% off

SiS, short for Science in Sport, is one of the biggest names in sports nutrition in the UK.

They're best known for their energy gels, which you'll spot everywhere from local parkruns to professional cycling races and major marathons. If you've ever watched elite runners grabbing brightly coloured sachets during a race, there's a decent chance they were using SiS.

What helped put SiS on the map was their isotonic gel. Unlike many traditional energy gels, it was designed to be taken without needing water at the same time, which made it particularly popular with runners and cyclists.

The range now goes much further than gels. SiS also sells hydration products, energy powders, protein supplements and recovery products aimed at helping people train harder and recover faster.

Whether you're training for a marathon, trying to beat a personal best or simply looking for something to keep you fuelled during longer workouts, SiS is usually one of the first brands people come across.

Things to know

• Get 20% off SiS products
• Best known for energy gels
• Hydration and recovery products available
• Popular with runners and cyclists
• Protein supplements available
• Used by amateur and professional athletes

How to claim the deal

Get 20% off your SiS order by using the link above and adding the promo code.

Browse the range, add your chosen products to your basket and complete your order online.

As always, terms and conditions apply.

SiS pricing

SiS is not the very cheapest option available, but it's usually more affordable than some of the premium specialist brands aimed at serious endurance athletes.

The biggest value tends to come when you're training regularly. If you're only going for the occasional jog, it's probably harder to justify stocking up on gels and recovery products. If you're training for an event or spending several hours a week exercising, the products start making a lot more sense.

SiS pros and cons

Pros

• Good taste
• Lots of flavours
• Huge range of sports nutrition products
• Well-known energy gels
• Widely used by athletes
• Good choice for endurance sports
• Easy to buy online

Cons

• Can become expensive if used regularly
• Some products are aimed more at endurance athletes than casual exercisers

Our thoughts

SiS has been around long enough that most runners and cyclists will have come across the brand at some point.

The gels are still the standout product. They're simple, easy to carry and have become a familiar sight at races and endurance events across the country.

The wider range is worth exploring too. Whether you're looking for hydration, recovery or extra protein, SiS has built out a product range that covers most training goals without becoming overwhelming.

If you're training regularly and want a sports nutrition brand with a strong track record, SiS is a top option.

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