Fuel up on carbohydrates and take your performance to the next level. Discover our scientifically formulated energy gels, bars and powders.


When you need energy fast, the GO Isotonic Energy Gel delivers great-tasting, easily digestible carbohydrate without the need for water.

Carbohydrates per gel


Energy source


Best for

60-90 Mins


Delivers not only a rapid supply of easily digestible carbohydrates for energy, but key electrolytes, to replace those lost via sweat.

Carbohydrates per gel


Electrolytes per gel


Best for

Hot conditions


A mental and physical energy boost to elevate your session and enhance your performance.

Carbohydrates per gel


Caffeine per gel


Best for

Caffeine Boost


A dual source energy gel designed for endurance sessions where you need between 80-120g carbohydrates per hour to maintain optimal performance.

Carbohydrates per gel


Energy source

Maltodextrin + Fructose

Best for

120+ MINS





The Science


Endurance Fuelling

Go further with more carbohydrates per hour

The BETA Fuel range is proven to be scientifically superior, providing an optimised 1:0.8 ratio of maltodextrin to fructose, so athletes are able to achieve a 120g per hour carbohydrate intake during prolonged endurance exercise.


When should I take energy supplements?

This depends on the individual and the type of exercise you’re doing. Whether it’s running, cycling, swimming or football, each athlete absorbs and processes carbohydrates at a different rate.

Generally, it’s a good idea to take energy supplement just before your session if it’s high intensity, while longer endurance exericse would benefit from consumption during the session.

Practice during training to ensure you know when and which energy supplements are best for you.

Can I just use Caffeine Gels?

Everybody has an individual tolerance to caffeine. Consume too much caffeine and this could negatively affect performance, depending on the individual. We recommend not consuming over 300mg of caffeine during an event, although some individuals can tolerate more.

It’s best to try-out your response to our GO Energy + Caffeine Gels in training. As best practice use GO Isotonic Energy Gels as your base and only take our caffeine based energy gels when you need a mental boost.

What does Isotonic mean?

The term ‘isotonic’ is used to describe a solution that is a similar ‘thickness’ to another solution. In the context of an energy gel, an Isotonic Energy Gel is a similar concentration (or tonicity), to our blood. Our blood has an osmolarity of 280 – 300 mOsm/L. This is the measurement for the concentration of the blood. So, both our isotonic energy gel and our blood have an osmolarity of 280 – 300 mOsm/L, which means they have a similar concentration of water, carbohydrates, sugar, salt etc.

The concentration is important when it comes to exercise becasue it impacts the amount of carbohydrates, electrolytes and fluids that go into your bloodstream and how quickly thy take effect.

As Isotonic gels have a concentration similar to your blood, it means your body can quickly replace the fluid you're loosing through sweat and provide a boost of carbohydrate.

Our Isotonic Energy Gels are designed to deliver a quick and convenient supply of great-tasting, easily digestible carbohydrate without the need for water.

How will the BETA Fuel Energy Gel give me more energy?

The BETA Fuel Energy Gel delivers 40g of carbohydrate in a single serving (compared to 22g from the GO Isotonic Energy Gel) to help you hit the recommended intake of 120g per hour during endurance exercise.

We have optimised this 40g of carbohydrates in our Beta Fuel Energy Gel with 1:0.8 ratio (maltodextrin to fructose) that increases your body’s carbohydrate usage efficiency, which in turn enhances your power output and limits gastrointestinal distress.

Need more energy information? Help Centre

Which gel and when?

An overview of the different types of energy gels

Train your gut for optimal performance

Your nutrition has the power to make or break your event. Minimise GI issues by having a planned & practiced fuelling strategy that you know works for you and your gut.

GO Energy Bakes

A delicious soft filled bake, delivering 30g of carbohydrate. A great alternative to gels to consume during exercise.



One of my favourite SiS products are the energy chews from the BETA range, super easy to eat and a great alternative to gels, whilst importantly getting in 46g of carbohydrates.
Tom Pidcock

INEOS Grenadiers

GO Isotonic Energy Gel provides me with the best solution to maintain stable energy levels during my demanding sessions.
Mohammed Reda El-Aaraby

Elite Running Team

The GO Isotonic Energy Gels are the perfect quick energy booster you need before training and competing - the variety of flavours mean you never get bored!
Jessie Knight

England Athletics

Having a GO Energy + Electrolyte Gel at the ready for my indoor Zwift sessions cave is a must for me as the mix of electrolytes and carbs is a great balance for the 60min power sessions.
Tim Don