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Best Caffeine Gel for Endurance: How Caffeine Fuels Performance
Choosing the best caffeine gel in Australia is less about the brand than about the number on the back. Most athletes take caffeine without ever adding up how much they have had, then wonder why the last hour felt jittery rather than sharp. This is the arithmetic, the timing, and where a gel fits alongside the coffee you already drink.
The short version
The evidence based range is 3 to 6 mg of caffeine per kilogram of body weight. For a 70 kg athlete that is 210 to 420 mg across the whole day, coffee included. A gel is not meant to deliver all of it. It is meant to put a measured top up in the second half of a race, when a coffee is not an option.
How much caffeine should an endurance athlete take?
The International Society of Sports Nutrition position stand puts the performance range at 3 to 6 mg per kilogram of body weight, taken around 60 minutes before the effort. Above roughly 9 mg per kilogram there is no further benefit and the side effects climb sharply.
That is a total for the day, not a per serve figure. It includes the flat white you had at breakfast.
Body weight
3 mg/kg, conservative
6 mg/kg, upper end
55 kg
165 mg
330 mg
65 kg
195 mg
390 mg
70 kg
210 mg
420 mg
80 kg
240 mg
480 mg
90 kg
270 mg
540 mg
For reference, a double shot flat white runs roughly 120 to 150 mg. A single shot long black is around 80 mg. Most Australian athletes are already halfway to their target before they leave the house.
What caffeine actually does in an endurance event
Three effects are consistently reported in the literature, and they are worth separating from the marketing.
It lowers how hard the effort feels
This is the best evidenced effect and the one athletes notice first. The same pace registers as less punishing. Over a marathon, that changes the decisions you make at 32km more than it changes your legs.
It sharpens focus and reaction time
Useful in a bunch ride, on technical trail, and in the second half of any event where your concentration is the first thing to go.
It supports repeated high intensity efforts
Most of the research is on endurance, but there is also evidence for sprint and power output. That matters for anyone whose event mixes steady work with surges: criterium racing, HYROX, a hilly trail race.
When to take a caffeine gel
Caffeine peaks in the bloodstream roughly 45 to 60 minutes after you take it, and stays elevated for hours. So the useful question is not when you take the first dose but how you space the total.
Event
Before
During
10k or parkrun
Coffee 60 min out is enough
Nothing
Half marathon
Coffee 60 min out
One caffeine gel at halfway
Marathon
Coffee 60 to 90 min out
One caffeine gel around 21km, a second around 32km
70.3
Coffee 60 min before the swim
One late on the bike, one early on the run
Full distance
Skip the pre race dose
Save it entirely for the marathon leg, spaced across it
The full distance line is the one most athletes get wrong. Loading caffeine at 6 am leaves you with nothing in reserve for the leg that decides the day.
Test the plan on two long sessions before you race it. Caffeine tolerance varies enormously, and race morning is the worst possible place to find out where yours sits.
The problem with most caffeine gels
A standard caffeine gel bundles the stimulant with 20 to 30 g of concentrated sugar. You are making two decisions with one sachet, and they do not run on the same clock. The caffeine keeps working for hours. The sugar is gone in twenty to thirty minutes, so you take another gel, which brings more caffeine you did not necessarily want.
By the fourth gel of a marathon you can be at 300 mg of caffeine without having planned any of it, on top of the coffee. That is where the jitters and the tight stomach come from.
Separating the two decisions is the whole point. Fuel on the schedule your body needs, dose caffeine on the schedule your head needs, and keep the two independent.
The best caffeine gel for endurance in Australia: UCAN EDGE Mixed Berry
UCAN EDGE Mixed Berry is the caffeinated gel in the range. It carries 45 mg of caffeine and 15 g of LIVSTEADY, the slow release carbohydrate that runs across 75 minutes or more, with zero sugar.
45 mg is deliberately lower than the 75 to 100 mg you will find on most caffeinated gels, and that is the argument for it rather than against it. A smaller unit is easier to plan around. Two of them across a marathon is 90 mg, which sits comfortably on top of a morning coffee without pushing a 70 kg athlete past the top of the range. A gel at 100 mg leaves you almost no room to manoeuvre.
It also means you can carry the same fuel for the whole race and only change flavour when you want the caffeine. The rest of the EDGE range is caffeine free, same carbohydrate, same texture, same 15 g dose.
Where it wins
45 mg is a planning friendly dose, not an all or nothing hit
Zero sugar, so the caffeine decision is separate from the fuel decision
15 g of LIVSTEADY covering 75 minutes or more from one pouch
Thin liquid texture, no bottle needed to get it down
Same format as the caffeine free flavours, so nothing else in your plan changes
Where it loses
If you want 100 mg in a single sachet, this is not it. You would carry two
One caffeinated flavour, where some brands offer three or four
Sugar gels arrive faster if what you want is a lift in the last kilometre
Coffee is the better pre race option. It is cheaper, you already know how you respond to it, and the dose is large enough to matter.
A gel is the better mid race option, for reasons that have nothing to do with the caffeine itself. It is portable, the dose is printed on the sachet, it does not need a cup, and it carries fuel at the same time. There is no aid station on the Gold Coast run leg handing out espresso.
Most athletes end up using both, which is exactly right. Coffee before, gel during.
Worked example: a 70 kg marathon runner
When
What
Caffeine
90 min before
Double shot flat white
140 mg
30 min before
One serve Energy Powder
0 mg
Km 10
EDGE, caffeine free flavour
0 mg
Km 21
EDGE Mixed Berry
45 mg
Km 32
EDGE Mixed Berry
45 mg
Total
4 gels, 1 powder, 1 coffee
230 mg, or 3.3 mg/kg
That total sits at the conservative end of the evidence based range, with the caffeine arriving when it is most useful rather than all at the start. Move the second Mixed Berry earlier if you want more of it in the last hour, or add a third if you tolerate caffeine well and have tested it.
Where caffeine goes wrong
Sleep. The half life is around five hours, so an afternoon session dosed at 4 pm is still in your system at bedtime. This is the most common reason athletes plateau and never connect the two.
Stomach. Large single doses are harder on the gut, particularly combined with concentrated sugar and hard running.
Tolerance. Habitual high intake blunts the effect. Some athletes taper caffeine for a week before an A race to restore sensitivity. It works, and it is unpleasant.
Losing count. The one that catches most people. Coffee, pre workout, gels and cola at aid stations all add up, and only the gels have a number printed on them.
Frequently asked questions
How much caffeine is in a UCAN EDGE gel?
EDGE Mixed Berry carries 45 mg of caffeine per pouch. Every other EDGE flavour is caffeine free. They all carry the same 15 g of LIVSTEADY, so you can mix caffeinated and caffeine free pouches through a race without changing anything about your fuelling.
Is a caffeine gel good before a marathon?
It works, but coffee is usually the better pre race choice because the dose is larger and you already know how you respond. Save the gels for during the race, where they do a job coffee cannot. A common pattern is coffee 60 to 90 minutes before the start, then one caffeinated gel around halfway and another at 32km.
How many caffeine gels can I take during a race?
Work backwards from your total. At 3 to 6 mg per kilogram, a 70 kg athlete has 210 to 420 mg to spend for the day. Subtract your coffee, then divide what is left by the caffeine in your gel. On a 45 mg gel that leaves room for two to five across a long race, depending where in the range you sit and how much you drank that morning.
Is 45 mg of caffeine enough to make a difference?
On its own, at the margins. As part of a total that already includes coffee, yes. The point of a smaller unit is that it lets you place caffeine where you want it in the race rather than committing to a large dose you cannot take back. Two of them across a marathon is 90 mg, which is a meaningful top up on top of a morning coffee.
Are there caffeine free energy gels?
Yes. Every UCAN EDGE flavour except Mixed Berry is caffeine free, and they carry the same 15 g of LIVSTEADY. If you want energy without any stimulant at all, that is the whole caffeine free range plus UCAN Energy Powder for the pre session serve.
Will a caffeine gel upset my stomach?
Caffeine itself is rarely the problem at these doses. The concentrated sugar it usually travels with is a bigger factor, because it has to be diluted in the gut before anything is absorbed. A sugar free gel removes that variable. Every gut is individual, so test it in training first.
Where can I buy caffeine gels in Australia?
Generation UCAN Australia is the official Australian reseller. EDGE Mixed Berry ships from our warehouse in Dandenong South, Victoria, with free shipping on orders over $220. Single sachets are available if you want to test one before buying a box.
References
Guest NS et al. International Society of Sports Nutrition position stand: caffeine and exercise performance. Journal of the International Society of Sports Nutrition, 2021.
Grgic J et al. Wake up and smell the coffee: caffeine supplementation and exercise performance, an umbrella review. British Journal of Sports Medicine, 2020.
Australian Institute of Sport. Sports Supplement Framework, Group A: caffeine.
Caffeine content of coffee is an approximation and varies with bean, roast and preparation. Guidance here is general and not individual advice. Caffeine tolerance varies widely between individuals. Test any change to your fuelling or caffeine plan in training before you race it.
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