What is the difference between the isotonic and the caffeinated gel?

The isotonic gel is your fuel during activity. The caffeinated gel is a timing tool for the moments you want to feel sharper. Many people use both: isotonic through the session, caffeinated before the start or in the closing stage. Gel Main contents Typical use Isotonic Hydrolysed carbs, B6, B9, B12 Repeatedly during activity Caffeinated Carbs, caffeine, beta-alanine, L-citrulline Before the start or one hard section

How many FUELR gels can I take per hour?

FUELR advises one to three isotonic gels per hour of activity, and one caffeinated gel about 30 minutes before or during the effort. Build up rather than jumping straight to three. Your gut needs practice at absorbing concentrated carbohydrate while you move, so use training sessions to find your ceiling. Also count everything else you take in: a sports drink or a bar adds carbohydrate too, and going over your own tolerance is the usual cause of stomach trouble.

Do I need to drink water with an isotonic gel?

An isotonic gel is mixed at a fluid concentration close to your body fluids, so it does not need extra water to be absorbed. That is the practical advantage over thick, syrupy gels. It does not replace drinking, though. You still lose fluid and salt through sweat, especially in warm conditions or on long rides, so keep drinking to your usual plan. If you sweat heavily, a drink with sodium alongside your gels helps; see our electrolyte options .

Can I take half a gel and save the rest?

Yes, and that is the point of the design. The pouch has an off-centre resealable nozzle, so you can take a few sips, screw it shut and finish it later. Two situations where that helps: splitting the 200 mg caffeinated gel into two smaller doses across a race, and taking small amounts of the isotonic gel every ten minutes instead of one large hit. It also keeps your hands and pockets clean, which reviewers mention often.

Are FUELR gels suitable for vegans and for a gluten-free diet?

Yes. The gels are vegan and gluten free, so they suit plant-based athletes and anyone avoiding gluten. As always, read the label on the pouch you receive, because recipes and flavours can change and allergen information on pack is the definitive source. If you have a diagnosed food allergy or intolerance, check the full ingredient list before an event rather than during it.

Are FUELR gels tested for banned substances?

FUELR gels are HASTA certified. HASTA is an Australian laboratory scheme that tests sports supplements for substances on the WADA prohibited list, and certified products are batch tested. That is a genuine level of assurance, and it is more than most gels carry. One nuance for UK competitors: many British federations and coaches ask specifically for Informed Sport certification. HASTA is a different scheme, so confirm which one your sport accepts before you use any product in competition.

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Discover FUELR energy gels: an isotonic gel with hydrolysed carbohydrates and B vitamins, plus a caffeinated version. We explain which gel suits your session, how often to take one and what the resealable cap changes.Read more →

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FUELR energy gels for running, cycling and endurance sport

What FUELR makes

FUELR is an Australian sports nutrition brand with a deliberately short range: energy gels. The isotonic gel holds 25 g of hydrolysed carbohydrates, mostly maltodextrin. Isotonic means the fluid balance of the gel sits close to that of your body, so it is absorbed without extra water. Each gel also carries vitamins B6, B9 and B12. Vitamin B6 and vitamin B12 contribute to normal energy-yielding metabolism. Folate (vitamin B9) helps reduce tiredness and fatigue.

The caffeinated gel adds 200 mg of natural caffeine from green tea extract, plus beta-alanine and L-citrulline. Caffeine, beta-alanine and L-citrulline have no authorised health claims in the UK or the EU. So we tell you what is in the gel, and we do not promise what it will do. 200 mg is a firm dose, roughly two cups of coffee. The off-centre resealable nozzle lets you take half now and the rest later, which is the reason many riders and runners pick it: less caffeine at once, and no sticky fingers.

How the two gels are used

Isotonic gel: one to three per hour of activity, or one just before the start and one during.
Caffeinated gel: one about 30 minutes before, or one during the hardest section.

These are FUELR's own directions. Be realistic about the maths: on long efforts most people aim for 60 to 90 g of carbohydrate per hour, so gels alone rarely cover a full marathon or sportive. Plan them alongside a drink, and test the combination in training, not on race morning. You can compare the wider fuelling range in our endurance sport selection.

Why we carry FUELR

We judge a gel on three things: the form of the carbohydrate, the dose, and the combinations. FUELR passes on all three. Hydrolysed carbohydrate in an isotonic base is absorbed without extra water, the B vitamins are present in amounts that carry an approved claim, and the caffeine sits in a separate gel instead of being stirred into every sachet. That last choice is why we stock it: you can dose caffeine in stages instead of all at once. We buy directly from the brand, our compliance team checks every label before it goes live, and we test products ourselves alongside independent lab spot-checks. Curious about the rest of our criteria? See how we select our brands.

Who these gels suit

FUELR fits runners, cyclists, triathletes and team-sport players who train longer than about an hour and want fuel that goes down easily at pace. Reviews of the range consistently mention two things: a gel-like texture rather than syrup, and flavours that stay drinkable late in a session. That matters more than it sounds, because flavour fatigue is a common reason people stop fuelling halfway through.

Honest context: no gel removes the need for gut training. If concentrated carbohydrate has bothered your stomach before, start with one gel on an easy session and build up. FUELR gels are vegan and gluten free, and they are HASTA certified, an Australian batch-testing scheme for banned substances. If your federation asks specifically for Informed Sport, check that requirement before you compete. Prefer capsules and powders for daily support instead? Browse the other brands in our range.

Frequently asked questions

FUELR is an Australian sports nutrition brand that makes energy gels and nothing else. The range has two products: an isotonic gel with 25 g of hydrolysed carbohydrates and vitamins B6, B9 and B12, and a caffeinated gel with 200 mg of natural caffeine from green tea extract, beta-alanine and L-citrulline. Both come in a pouch with an off-centre resealable nozzle, so you can take part of a gel and close it again.

The isotonic gel is your fuel during activity. The caffeinated gel is a timing tool for the moments you want to feel sharper. Many people use both: isotonic through the session, caffeinated before the start or in the closing stage.

Gel	Main contents	Typical use
Isotonic	Hydrolysed carbs, B6, B9, B12	Repeatedly during activity
Caffeinated	Carbs, caffeine, beta-alanine, L-citrulline	Before the start or one hard section

It is a full dose, not a light one. EFSA has assessed caffeine and published reference amounts for healthy adults, shown below. One caffeinated gel reaches the single-dose reference on its own, so count your coffee, tea and energy drinks on the same day. Splitting the gel is easy thanks to the resealable nozzle. If you are pregnant or breastfeeding, the daily reference is lower.

Situation	EFSA reference amount
Adults, single dose	200 mg
Adults, per day	400 mg
Single dose before exercise	3 mg per kg body weight
Pregnancy and breastfeeding, per day	200 mg

Source: EFSA

EFSA. (2015). Scientific Opinion on the safety of caffeine. https://www.efsa.europa.eu/en/efsajournal/pub/4102 NHS. (2023). Foods to avoid in pregnancy. https://www.nhs.uk/pregnancy/keeping-well/foods-to-avoid/

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