GO Isotonic Energy Gels

The world’s first fast-absorbing, easy-to-digest isotonic gel
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Informed Sport

FUEL YOUR PERFORMANCE

Containing 22g of carbohydrates and designed for versatile fueling, whether for endurance or intensity, this clean energy source helps you keep your pace, push through fatigue, and finish strong.

FAST ENERGY

Easy on your stomach, the gel is designed for rapid digestion

ISOTONIC FORMULA

The unique formula allows for easy consumption without needing extra water

Energy in Your Pocket

Lightweight, portable, and perfect for training, competition, or any workout that demands endurance

SINGLE SOURCE

Formulated with maltodextrin, a clean, single-source carbohydrate source that delivers reliable energy

  1. Vitamin B1 & B2 contribute to carbohydrate conversion
  2. Vitamin B6 aids protein metabolism.
Eilish Mccolgan taking a SiS GO Isotonic Gel mid runEilish Mccolgan taking a SiS GO Isotonic Gel mid run

USED BY ELITES

A quick liquid carbohydrate gel that’s best used during intense exercise sessions to maintain energy and delay exhaustion. The isotonic formula absorbs quickly, so you can fuel without bloating or needing extra fluids.

Recognized as the world’s first isotonic energy gel and winner of the Queen’s Award for Enterprise (Innovation) in 2015, it remains the go-to choice for top athletes across endurance and team sports worldwide.

Why Elite Athletes Choose GO Isotonic Gels

  • Supports steady energy to help you maintain pace longer
  • Unique formula means no need for extra fluid intake
  • Absorbs smoothly to prevent stomach upset
  • No artificial flavors, just clean, effective ingredients
Athlete adjusting their watch holding a GO Isotonic Energy GelAthlete adjusting their watch holding a GO Isotonic Energy Gel
Wild water swimmer having a GO Isotonic Energy Gel in the waterWild water swimmer having a GO Isotonic Energy Gel in the water

SUGGESTED USE

Depending on your sport and intensity, aim for 1–3 gels per hour to reach a 60–90g carbohydrate target.

Tear open, squeeze, and go whenever you need a quick energy boost

ENGINEERED FOR ENERGY

Depleting carbohydrate stores is one of the biggest causes of fatigue during exercise. Replacing those stores with fast-acting carbohydrates improves endurance, delays fatigue, and keeps performance levels high when the effort intensifies.

FUEL DURING EXERCISE

To maintain optimal energy, consume 60-90g of carbohydrates per hour during training or competition. The GO Isotonic Energy Gel provides rapid energy uptake without adding liquid volume, so you stay fueled and focused, not heavy or sluggish.

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SUPPORT THE SWEAT

Each gel helps stabilize blood glucose, sustain endurance, and prevent “hitting the wall.” By delivering quick, efficient carbohydrate replenishment, it supports your body’s glycogen stores and keeps muscles performing longer. Designed for endurance athletes and team players alike, this gel works as hard as you do, especially when fatigue sets in.

WHAT IS ISOTONIC?

“Isotonic” means the gel matches your body’s natural fluid balance, allowing it to empty from the stomach quickly and deliver energy immediately: no extra water needed. This is also known as osmosis, and it helps maintain the balance of blood cells by maintaining the same concentration of solutes as the fluid inside the cells. This allows your cells to function properly. 

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WHAT IS ISOTONIC?

Created in 2000, the GO Isotonic Energy Gel provides a convenient source of carbohydrates and hydration to support your performance. Its isotonic formula is designed to match the body’s natural fluid balance, allowing for rapid absorption and easier digestion during exercise. By helping maintain hydration and energy levels, this gel can help you sustain your effort for longer and reduce the risk of fatigue-related issues. 

Reviews

Reviews

4.8/5
72 reviews

by Chris Uber

25/10/2018

Loving these gels. This is the first gel that is easy to take while doing an activity. You don't have to struggle to make sure you get all of the gel and you don't waste half a bottle trying to wash it down. Much smoother than other gels that are like trying to eat peanut butter. And the taste is spot on.

by LC

03/10/2018

Best flavor I've tried so far!

by Guest

02/10/2018

I haven’t found a better energy gel that sits so well in my stomach. I can down the entire thing without hesitation.

by SINDY Almaraz

24/09/2018

The best for long runs, you don’t need add water and the flavor is really good

by Eric Hanson

08/09/2016

Amazing gels, basically instant energy, taste great, easy on tummy.

by Guest

30/09/2018

Love this product for the simple reason it goes down easy. It’s not thick and gooey like all other gels I’ve tried and you can take it without water which is nice. I bought the cherry without the caffeine and I love it

by Jay

27/09/2018

All I can say is wow. Great flavors with not aftertaste and from a performance standpoint, all my buddies ask what I am using for energy because the improvement is noticeable.

by Raghu

31/10/2018

Like this flavor the most

by K. Graves

22/10/2018

Im biased, this is my favorite flavor. Easy to use, great flavor, no stomach ache!

by John T

18/10/2018

One of my favorite flavors. Great product in that I don't have to worry about taking with water and timing them with aid stations during a race. I can take them whenever I want or need to.

by Bryan Thornton

15/10/2018

Love the taste goes down easy would recommend this to friends and maybe competitors

by Chance Morgan

11/10/2018

Always great! My tried and true.

by Guest

10/10/2018

At first I wasn't entirely taken by the flavor, but this turned out to be one of the best things about the Gels. There is more liquid than most gels I have used in the past, and often the intense flavor can be overbearing. SIS Gel's have a very subtle flavor and are extremely easy to consume, meaning you get the full benefit from the nutrition. I had no gastric upset from the Gel. I took the Gel 1 hr into a 2 hr ride. There was no sugar spike, just a maintained level of energy throughout the rest of my ride.

by Guest

10/10/2018

Great taste. I did not need water.

by Guest

08/10/2018

Good for sustainability during long runs

by Elaine Keating

05/10/2018

Not my favorite flavor but they went down easy. Nice not to have to drink when taking them.

by Guest

05/10/2018

love them, the presentation is great for longer rides. the packaging will hold when in the hydration pack along with the tools and extra tube.

by Guest

04/10/2018

Tastes good and truly does not need to be taken with water--amazing! The only complaints I have are the full price ($$) and the difficulty to open the packs while running. If my hands are a bit sweaty, it is very hard to open the energy gel pack.

by Guest

04/10/2018

Smooth texture and consistency makes these easy to drink/eat while on a run or bike ride. Flavor is good too!

by Kelly

03/10/2018

Given that I don't enjoy Lemon & Lime Gatorade I was a little skeptical however, this taste A LOT better than Gatorade.

by Guest

03/10/2018

Taste good. Nice energy boost.

by Guest

01/10/2018

Taste was ok. Great performance but I don’t like things with artificial sugars.

by Guest

30/09/2018

Great taste, not too thick, heavier than other gel or goo packets but I like waaaay better. Also no nasty post gel burps or tummy rumble.

by Guest

28/09/2018

Unappealing flavor, sloppy and messy when opening and consuming while riding on bike, need to follow with water to get rid of after taste. I'll stick with my favorite GU gel which seems just as effective and much easier to open and consume with out mess. After using one package I'm done with this and have been giving them to friends to sample. No one has asked for a second sample.

by Gina Cole

27/09/2018

The taste, texture and volume of this product are very unique, and to my liking. I appreciate that I don't need to "wash it down" with more liquid.

by Herman Lopez

27/09/2018

Fantastic flavor and delivers much needed energy quickly with no stomach upset.

by Joe Z....

27/09/2018

My daughter loves to use these during her triathlons.

by WALTER

19/10/2018

Better than Gu, goes down fast without a sticky mess. Worked well in my last century ride

by Guest

07/10/2018

This is a great product - the benefit is almost instant - right now I’m looking for something that’s more like a power bar - the trouble with bars is that they’re hard to get down - too much chewing and too sweet, so your mouth is full of sugar for an hour - if only there was something in between a gel and a bar that was more substantial, but easier to chow down on....

by Mark Ferguson

25/09/2018

Great fuel, easy to use and fast results

by Christopher Malenab

01/10/2018

Excellent flavor what I want to change from my two favorites (vanilla and apple)

by DENNIS SCHAMP

27/09/2018

Works better than the smaller, "GU" style products.

by Chris Fulbright

16/09/2018

Great taste and easy to get down. What really makes this gel the best is the packet. It's very easy to open on the bike with no mess.

by Simon Thomas

06/09/2016

Used them for a while, great for the bike.

by Riamar Tayam

04/08/2016

Truly works and flavor is subtle.

by carlos` barrios

03/08/2016

Good flavor, all product have a good taste, no after taste no water need after raking a gel so overall good product

by craig burleigh

27/07/2016

Little weak on the orange taste, but it works!!

by Guest

22/10/2018

I really like these gels as they are easily digested and do not need to be taken with water; my only negative is that I bought a "bulk" pack and they have an exp. date of 02/19. I wish these would last a little longer.

by Cameron Paterson

26/09/2018

Great product. Great flavor. I use them for very exercise

by Anders Dybdahl

24/09/2018

These gels are the best on the market. Not only do they taste good, they provide the needed energy without destroying your gut.

by Maddi

21/09/2018

Love the taste! Easy and compact for running packs!

by Daniel Corredor

17/09/2018

Gels are excellent and work for training easy on the stomach

by Guest

02/11/2018

I like all the flavors. You don't need water with them.

by Guest

23/10/2018

Excellent product that doesn’t make you sick while running.

by K. Graves

22/10/2018

Not overly sweet which is awesome. Again so easy to use and no stomach issues.

by Boricuatri

17/10/2018

This gels are absolutely amazing. Love everything about them. The flavors, the liquid texture to them and the best part, that they do not cause GI distress under any circumstances. I've used them in training and during racing and no problems whatsoever.

by Guest

12/10/2018

I really like that these are easy to take in and don't need water.

by Chance Morgan

11/10/2018

Delicious flavor, same great performance as the original Lemon & Lime!

by Guest

11/10/2018

Excellent. Easy to carry and take on the run. Great taste and no need for water.

by Guest

08/10/2018

Not the best taste but got the job done. Gave me energy for my runs.

by Guest

08/10/2018

Great taste and good amount of energy. Not too slow not overly done.

by CALVIN

04/10/2018

This flavor taste great, probably one of my favorites

by Guest

04/10/2018

Great tasting product perfect for long rides

by Cheston VanAlstyne

04/10/2018

These gels are great for my long runs and my triathlons.

by Kelly

03/10/2018

Really enjoy the flavor, probably one of my favorite.

by Guest

29/09/2018

The Go Energy gel packs are exactly what I need to make it through a rough workout!

by Guest

29/09/2018

For five years I did long distance triathlons with Gu, water, and Gatorade. I always started to peter out at the end, and assumed it was just my training. Made the switch to this product, six months before my last half iron. PR the course by close to 25 minutes over my last half iron distance on similar terrain. The only changes I made were in fueling with this product and increased water intake.

by Omar Meer

29/09/2018

Great taste! Easy on my stomach.

by Joseph

28/09/2018

Love the flavor of this one, no off-flavor after-taste, none of the strange gel like stickiness feeling, and no water needed to wash it down!

by Guest

27/09/2018

Tasty, love that u don't need water

by Chris Hepburn

20/10/2018

These do the trick. I’m a big fan of this product.

by Hieu Nguyen

10/10/2018

I have used these several times to prevent from bonking. These gels have always occupied a cycling jersey pocket on all of my rides for a quick energy boost.

by Wayne Tucker

28/09/2018

The tropical flavor is great. The gels provided a boost and are easy to carry.

by Nic Faure

25/09/2018

Great and easy to use. These work great along with the electrolyte and caffeine gels.

by Bryan Prince

24/09/2018

Love these gels! The flavor is great and the performance is better.

by ALVARO Fernandez

24/10/2018

Goes down easy it’s like drinking water.

by Guest

22/10/2018

Bought the Tutti-Frutti flavor to see how it taste. I like it so far.