Informed Sport tested

Energy Gel. Your stomach shouldn’t decide your race.

Low Salt and High Salt gels: same carbs, two salt levels, gels per hour by intensity and sweat

Energy Gels box and sachets: 40g carbohydrate, 98 or 386mg sodium, 1:1

Customer reviews of the Energy Gels, rated 4.8 out of 5

The ingredients of the Energy Gels around a sachet

Energy Gels nutrition facts and ingredients

For runners who gave up on gelsBest seller

Energy Gels

Name: Energy Gels
Brand: truefuels
Price: 29.95 GBP
Availability: InStock
Rating: 4.78 (240 reviews)

4.8 · 240 reviews

40g carbs and 98mg or 386mg sodium in one gel.

Informed Sport certified · Developed with Alistair Brownlee

Tested with 50+ elite athletes, then raced at the Castle Race Series.

2 · # Sachets: 10

10 20 404% off 608% offBest value

Not sure which? Start with the Mix Box: 5 Low + 5 High. Ten long sessions to find your setting.

3 · Salt Content: Mix Box

Low Salt High Salt Mix Box

98mg or 386mg sodium per gel. Low Salt for normal sweat; salt marks or extreme heat: High Salt.

1 · Choose your plan

Flexible PlanSubscribe · save 30% Skip or cancel any time.

Every delivery30% off
Month 3Free bottle
Month 6Free Pro membership

30% off every delivery Delivered every month Free bottle after your third month Free Pro membership in month six: free shipping, early access to new drops and merch Skip, reschedule or cancel anytime One-time purchaseBuy once £29.95

Skip or cancel any time.

60-day guarantee, opened or not. See Delivery and returns

Made in the UKInformed Sport certified

40g carbs · 1:1 glucose:fructose · Unflavoured

4.8 240 reviews

“Great taste! Really easy to digest. No stomach issues after… easy to digest. No stomach issues …”

Oli L. · review via Judge.me

“… easy to digest and stop me from needing to carry salt tabs as well… stop me from needing to carry salt tabs …”

Mike P. · review via Judge.me

“hands down the best gels I’ve used”

Dylan E. · review via Judge.me

Batch tested

Our philosophy

Own your physiology. We develop what it takes for you to do just that.

Same philosophy, every product: based on the latest science, test it in the real world, stripped of anything that isn’t needed to perform again tomorrow.

Used by elite athletes around the world.

How to use

Low Salt for normal sweat. Salt marks on your clothes or extreme heat? Replace Low Salt with High Salt. Mix the two to set your hour.

Gels per hour, from the box: 1 at low intensity, 1 to 2 at medium, 2 to 3 at high. On high sweat, 1 Low + 1 High at medium and 1 Low + 2 High at high.

Before	One gel 15 minutes before the start.
During	Gels by the table on the box, with water.
After	Refuel, then note what worked for next time.

For a plan built on your race, your sweat and the weather, use Your plan on this page. For a personal recommendation, email support@truefuels.com.

What it does

Each gel carries 40g of carbohydrate in a 1:1 glucose to fructose ratio, with electrolytes built in.

Two salt levels, 0.25g or 1g, so you can match the gel to how much you sweat. Neutral flavour, no artificial colours.

40g carbohydrate
Two salt levels
Easy on the stomach
Race tested

Delivery and returns

Delivery to the UK: 1 to 3 working days, free over £40, otherwise the fee shows at checkout.

The 60-day guarantee covers opened products. If it isn’t right, email support@truefuels.com within 60 days of purchase for a full refund.

You can cancel an order within 14 days, then return unopened products in their original condition within a further 14 days. We refund in full within 14 days of receiving them. Return postage is yours unless the item is faulty.

Faulty or damaged? Email support@truefuels.com with your order number and a photo. Full details in our returns and refunds policy.

Energy Gels · from £29.95

01 / The problem

Energy Gel · 40g carbohydrate

Gels 1 and 2
Other gels: ~~Most gels are built for the first hour.~~ truefuels: 40g of carbs and the salt you need, in one gel.
Gels 3 and 4
Other gels: ~~Too sweet, too thick.~~ truefuels: Thinner than most gels.
By the third, the sweetness and the thickness are what you remember, not the carbs.
Gels 5 and 6
Other gels: ~~A stomach that votes against the plan.~~ truefuels: Gel six tastes like gel one.
Mild, with a hint of salt.

“Most gels I just can’t stomach, 2 is my limit, but these are no problem at all.”

Thomas S., review via Judge.me

02 / Why it works

Fuel that keeps pace with the effort.

01

40g carbohydrate
Enough to matter on long days, in one sachet. Two gels an hour gives you 80g.
02

Two salt levels
Low for normal sweat. High when you see salt marks on your clothes or race in extreme heat.
03

“Easy on the stomach.”
“… managed 8 gels in 4 hours with no stomach issues. …”
JF, marathon · review via Judge.me
04

Race tested
Tested with 50+ elite athletes before launch, then raced at the Castle Race Series.

03 / The dial

Two salt settings, one rule.

Mix the two to set your hour.

Low Salt for normal sweat.

Gels per hour	Normal sweat	Salt marks or extreme heat
Low intensity	1 Low · 40g · 98mg	1 High · 40g · 386mg
Medium intensity	1 to 2 Low · 40 to 80g · 98 to 196mg	1 Low + 1 High · 80g · 484mg
High intensity	2 to 3 Low · 80 to 120g · 196 to 294mg	1 Low + 2 High · 120g · 870mg

The salt is already in the gel, so you’re not carrying tabs.

04 / Proof

“Easy on the stomach.”

4.8

240 reviews

96%: rated the gels 4 or 5 stars

★ 4.8 from 238 reviews · 228 of 238 rated 4 or 5 stars · Developed with Alistair Brownlee, two-time Olympic triathlon champion

“Love them, the taste is great and are very easy on my stomach. Highly recommend”
Bryan D. · review via Judge.me
“… I have been able to build up use to 120g+/hr whereas with other brands I was struggling with such high carb loading.”
mark m. · review via Judge.me
“Easy on the stomach and great fueling for long rides.”
Jez T. · review via Judge.me
“A great product and very easy on the tummy.”
Mark W. · review via Judge.me
“… I find it easy to digest with no stomach pain or cramping. … I’m training for my first Ironman and find these help on the long training efforts.”
Damen F. · review via Judge.me
“… It helped me achieve a 21-minute PB in a Half-Ironman race this summer.”
Tom C. · heavy sweater · review via Judge.me

5 stars: 201 (84%)
4 stars: 29 (12%)
3 stars: 7 (3%)
2 stars: 2 (1%)
1 star: 1 (0%)

Some of the reviews shown are from related products the merchant grouped with this one.

Problem it solved: Finding a high carb gel that has a nice taste and has a high sodium option for those hot days.

After learning the hard way that you really do need to take on some carbs during a marathon I have tried many different gels over the years. Truefuels are the only brand I have subscribed to receive every month.

used for first time in a race unique taste! It was hotish in pontevedra managed to get 2 gels down on the bike but couldnt stomach another on the run. I think prob get some of the lower salt gels for UK races.

Love them, the taste is great and are very easy on my stomach. Highly recommend

Suffering with severe IBS most gels don’t agree with me. During an Ironman I need something I’m confident in using. 2 Ironman and 2 podiums with 0 loo stops 🙌 definitely gets my vote

New packaging has taken this product from a 4 star rating to a 5 star rating. I use this alongside the rehydration packs and this works superbly. Used these in Tenerife and at the Marmotte Gran Fondo and kept my energy and hydration levels spot on. The great thing with the energy gels is the ease of taking on board - I find I don’t need much water if any to wash down. I have even converted my son onto these, he is fussy but finds them very palatable.

Really like the product. Taste of gel and electrolyte mix very palatable! Certainly more tasty way to fuel during race!

First time taking these and I had no stomach issues at all which is very rare. Will definitely be continuing with these gels.

Great bottle to train with and they stand out in the crowd

Found the gel themselves really effective but getting into the packaging was very hard! We could only make a small hole in it and the gels ended up on the outside of the packet as well, making everything sticky. Should they open more than this?

Nice to have choice about salt content. The gel is very easy in the digestive system... absolutely love the honey taste. Thanks for a great product. Will recommend to all my running buddies as we practice our fueling for Dublin marathon in October.

So far, so good. I'd bought the race ready set up ahead of a 70.3 and have been using the gels and the electrolytes to train. The addition of salt is a pro and con - great in terms of replacing what's lost, but you can taste the salt in the drink especially (less so in the gel). Nonetheless, I'm impressed - no GI distress (yet) and as someone with collitis (and therefore a very sensitive stomache to trying new things) that's key!

Wife loves it

Love the 40g of carbs/gel vs 30, makes it easier to dial in the required amount for longer races. Same for the high salt content, especially in summer training. Also makes the taste is not as sweet as other gels. Solvability in bottles is an added bonus for convenient fuelling in the bike.

Used every time, these are amazing

So far I'm loving the gels, early days but they've worked wonders with my performance and I'm a fan of the 40g of carb's and the salty dual mix is a winner for me. The only negative has been that out of the 60 gels ordered there were a couple that had burst. Not sure why but its left a bit sticky mess and its a shame to waste good energy.

I've been using TrueFuels Energy Gels for a number of months now during longer training sessions, half marathons, Munro hikes, and extended cycling rides, and they've become my go-to fuel source.

What really stands out is the flavour. Unlike many energy gels that can become sickly sweet or artificial tasting after a few hours of exercise, the Trueffuels gels are genuinely enjoyable and easy to take, even when working hard or several hours into an activity.

From a performance perspective, they deliver exactly what I need. The combination of fast-acting carbohydrates and electrolyte salts helps maintain energy levels and replace what is lost through sweat, whether I'm pushing through the latter stages of a half marathon, tackling a long climb in the hills, or spending several hours on the bike.

The consistency is spot on as well. They're not overly runny, which can make gels messy and awkward to use on the move, but they're also not too thick or 'kleggy' like some competitors. They go down easily without needing excessive water afterwards, making them practical during races and outdoor adventures alike.

I've found them easy on the stomach, reliable for maintaining energy, and convenient to carry. Whether I'm training, racing, hiking Munros, or heading out for a long cycling session, they've consistently performed well.

Overall, I'm extremely happy with Trueffuels Energy Gels and would happily recommend them to anyone looking for a great-tasting, effective, and easy-to-use energy gel that provides both essential carbohydrates and electrolyte replenishment during endurance activities.

Like the larger size with 40g carbs
Easy to digest nice texture

A good flavour that’s not too sweet, good packaging that stays in one piece and worked well for me on a 64k run. I didn’t notice any immediate issues relating to GI upset.

Shipment was quick and felt the benefits of first test of gel during long run.

Alistair’s perspective

Alistair Brownlee · Two-time Olympic triathlon champion · Co-founder

05 / The system

Works best as a system.

Electrolytes
1g Salt per stick · 390mg sodium
From £24.95
CoreCtrl
4,000mg L-Taurine
From £28.95
Gels and electrolytes
The Training Bundle
Shop the bundle

The Fourth Discipline™

The system is ours. The destination is yours.

06 / Formula

What's inside. Nothing it doesn't need.

Six ingredients plus water. Every one has a job, and every job fits on one line.

Read the full science

This formula doesn’t stop evolving once it ships. We keep testing and refining it with sports scientists and our own athletes.

See our process

Glucose and fructose, 1:1. The fuel for long efforts

or 98mg From Himalayan salt: 1g salt in High Salt, 0.25g in Low Salt.

From coconut. 14% of your daily reference intake, in every gel.

8% of your daily reference intake, in every gel.

Mix the two to set sodium independently of carbs. 1 Low + 1 High = 80g carbs and 484mg sodium an hour.

Per gel: 160 kcal · 40g carbohydrate · 23.4g sugars · 288mg potassium · 30mg magnesium. Where two values are given, the first is High salt.

07 / How to use

Simple enough to do at race pace.

One gel 15 minutes before the start. Then by the table on the box, for your race:

Your kit

CoreCtrl
Energy Gels
Electrolytes

Race protocol · Marathon

Hot race: 1 CoreCtrl sachet a day from 7 days before, the eighth on race morning
30 min before: 1 Electrolytes in 500ml water
Pre-start: 1 Energy Gel
Energy Gels: 2 an hour = 80g carbs. Low Salt for normal sweat; salt marks or extreme heat: High Salt
Hydration: 150 to 250ml per gel. Heat or heavy sweat: 1 Electrolytes
Straight after: 1 Electrolytes in 500ml water

08 / Your plan

Get your personalised fuelling plan.

Your weight, your sweat, your race. We’ll tell you how many gels, which salt level, and when. No maths at mile 18.

Your Details

Weight kg

Bottle size ml

GI Tolerance

Sweat Saltiness

Training Volume

Hours per week h/week

Select Your Race

Race Details

Time

Temperature °C

Humidity %

RPE (1 to 10)

Session

Swim

Bike

Run

Duration

DistanceOptional

Temperature °C

Humidity %

RPE (1 to 10)

Session

Distance

Time

Temperature °C

Humidity %

RPE (1 to 10)

Session

Time

Temperature °C

Humidity %

RPE (1 to 10)

Session

Time

Temperature °C

Humidity %

RPE (1 to 10)

Session

Time

Temperature °C

Humidity %

RPE (1 to 10)

Session

Distance

Time

Temperature °C

Humidity %

RPE (1 to 10)

Session

Time

Temperature °C

Humidity %

RPE (1 to 10)

Session

Sweat Rate L/h

Sweat Sodium mmol/L

If you have tested your sweat rate or sodium concentration, entering these will sharpen the fluid and electrolyte recommendations. Leave blank to use the algorithm's estimates.

If you have more questions, contact support@truefuels.com

Algorithm informed by published research on exercise fluid replacement, sweat rate, sweat sodium concentration and carbohydrate use during endurance exercise, including Sawka et al. (2007), Jeukendrup (2011) and Baker (2017). Constants: 40 g carbohydrate per gel, 1 g salt per high-salt gel, 0.25 g salt per low-salt gel and 1 g salt per electrolyte serving. Scientific estimate only. Individual variation exists. Validate all recommendations in training before race day.

If you have more questions, contact support@truefuels.com

09 / Athletes

Trusted from the podium to the parkrun.

Tap a face to read their story.

Alistair Brownlee
“By race day, your legs should be doing the work, not your brain.”
Alistair Brownlee · Co-founder
Ben Millar
“For me, it’s pretty simple: the gels taste great, they’re easy to consume, and I’ve had zero stomach issues with them. 40g of carbs never felt so easy.”
Ben Millar · Reflex-Nopinz
Malachi Cashmore
“A gel I can actually get down means I’m still fuelling when it matters most.”
Malachi Cashmore · Professional triathlete
Joanna Tallmann
“What I like about truefuels is the understated flavour. It’s not a taste you get tired of quickly.”
Joanna Tallmann · Ultrarunner

10 / Questions

Questions? Answered.

Visit the help centre

Which gel do I use?

Low Salt for normal sweat. Salt marks on your clothes or extreme heat? Replace Low Salt with High Salt. Mix the two to set your hour.

Is it sweet?

Mild. Reviewers most often say “not too sweet” and “easy to get down”.

I’m switching from Maurten, SiS or Precision. How do I start?

Swap like for like on 40g, then use your long sessions to test before race day.

What does it cost per 10g of carbs?

£0.75 one-time for a box of 10, from £0.48 on the Flexible Plan.

Do I still need electrolytes?

Up to 870mg sodium an hour comes from the gels, at 1 Low + 2 High. Heavy or salty sweaters add Electrolytes in the bottle.

How do I open it on the bike?

Tear from the notch, one-handed.

Delivery?

Delivery to the UK: 1 to 3 working days, free over £40, otherwise the fee shows at checkout. The delivery date for your order is shown under Add to cart.

Can I put it in a bottle?

Yes. It’s thinner than most gels, so many customers mix it into water on the bike.

Is it tested for banned substances?

Every batch is Informed Sport certified before it ships.

truefuels® · The Fourth Discipline™

Train with it before you race with it.

Order a Mix Box, use it on your next three long sessions, and race with the setting that worked.

Order a Mix Box

Energy Gels

Other gels: Most gels are built for the first hour. truefuels: 40g of carbs and the salt you need, in one gel.

Fuel that keeps pace with the effort.

40g carbohydrate

Two salt levels

“Easy on the stomach.”

Race tested

Two salt settings, one rule.

“Easy on the stomach.”

Works best as a system.

Electrolytes

CoreCtrl

Never run out mid-block. Save 30%.

The system is ours. The destination is yours.

What's inside. Nothing it doesn't need.

Simple enough to do at race pace.

Get your personalised fuelling plan.

Trusted from the podium to the parkrun.

Questions? Answered.

Train with it before you race with it.