Caffeine Combined With L-Theanine for Gaming

This pairing mattered to me more than almost anything else when we were putting the Levelz® formula together.

It's easy to chuck a stimulant dose into a gummy and call it energy. Getting the balance right so it feels good to use, that's the harder part, and it's the part I cared about most.

Caffeine alone vs caffeine with L-theanine

This is how people commonly describe the difference. It's lived experience rather than a lab result, and the research section below covers what's actually been measured.

Factor	Caffeine alone	Caffeine with L-theanine
Jitteriness	Common at higher doses	Often reported as less
How focus feels	Sharp but can feel scattered	Often described as calmer
Duration of clean feeling	Shorter before jitters build	Often described as steadier
Comedown	Can feel abrupt	Tends to feel more gradual

The "how focus feels" row is the one worth dwelling on, because it's the difference people notice most in practice.

Caffeine alone makes you alert, but alert isn't the same as focused. At a high enough dose you get a kind of scattered urgency where you're wide awake and finding it harder to settle on one thing. That's fine if you need to stay conscious. It's counterproductive if you need to hold your attention on a match for two hours.

What does the research on caffeine and L-theanine say?

Caffeine blocks adenosine, the chemical that makes you feel drowsy, which is why it wakes you up. But on its own, it can also push your nervous system into a slightly overstimulated state, particularly past a certain dose.

L-theanine is an amino acid found naturally in tea leaves. It's generally described as calming without being sedating, which is the important distinction. It isn't a relaxant fighting against the caffeine.

Caffeine combined with L-theanine has been tested in a handful of small, controlled studies:

A Northumbria University study gave people 150mg of caffeine with 250mg of L-theanine. Compared with placebo, the combination led to faster reaction times on some tasks, better accuracy on others, and lower "headache" and "tired" ratings. L-theanine on its own actually raised headache ratings and lowered scores on one mental arithmetic task.
A study of 27 people found 50mg of caffeine with 100mg of L-theanine improved speed and accuracy on an attention-switching task and reduced distraction in a memory task.
A study of 44 young adults found 40mg of caffeine with 97mg of L-theanine improved task-switching accuracy and self-reported alertness, with no effect on other tasks such as visual search or reaction time.
A brain-activity study using 50mg of caffeine with 100mg of L-theanine found better performance on an attention task with the combination than with placebo.

A 2014 review that pooled 11 trials found moderate effects of the combination on alertness and attention switching in the first two hours, with the changes tracking the caffeine dose more closely than the L-theanine dose.

Worth being honest about the limits. These were small, single-dose studies measured over an hour or two in a lab, not long gaming sessions. None of them measured "jitters" directly. And two were run by researchers at Unilever, which sells tea. It's a promising and fairly consistent picture, not a settled one.

Where do L-theanine and caffeine occur naturally?

Tea is the natural source of both. Green, black, white and oolong tea all come from the same plant, and every cup contains caffeine and L-theanine together, which is part of why so many tea drinkers describe a calmer kind of alertness compared with coffee.

The amounts per cup are smaller than people expect. A lab analysis of 37 commercial teas found brews averaged roughly 5mg to 6.5mg of L-theanine and 16mg to 19mg of caffeine per gram of tea. A typical teabag holds around 2g, so a cup lands at very roughly 10mg to 13mg of L-theanine and 30mg to 40mg of caffeine, depending on the tea and how long you brew it. Black tea came out slightly lower in L-theanine, and pu-erh had almost none.

Matcha is powdered whole tea leaf, so you drink the leaf rather than an infusion of it. Amounts vary a lot by grade and how much powder you use, so I wouldn't trust a single number for it.

Coffee and guarana are different. They give you caffeine but no meaningful L-theanine. That's also true of the 60mg of caffeine in Levelz® that comes from guarana, which is why the L-theanine is added separately.

The same goes for most gaming energy drinks. The classic cans get their caffeine from added caffeine, coffee or guarana, with no L-theanine at all. A few newer formulas add it, so it's worth checking the label rather than assuming. We compare the formats properly in energy gummies vs energy drinks for gaming.

To get the amounts used in those studies from tea alone, you'd need several cups, which is exactly why formulating it directly makes sense.

Levelz® dosing

Each Levelz® serving contains 150mg of caffeine paired with 150mg of L-theanine.

To be clear about where that comes from: the studies above mostly used more L-theanine than caffeine, roughly two to one, and often lower caffeine doses than ours. A one-to-one ratio is our formulation choice rather than a ratio proven to be best. We picked 150mg of L-theanine because it sits inside the range those studies used (roughly 100mg to 250mg), alongside a moderate caffeine dose, without the serving becoming mostly theanine.

Ingredient	Per serving	Why it's in there
Caffeine (total)	150mg	Alertness and energy
L-theanine	150mg	Paired with the caffeine for a calmer feel
Lion's Mane extract	500mg	Functional mushroom, research still early

L-theanine sits alongside Lion's Mane in the formula. They're there for different reasons and on different timescales: L-theanine is paired with the caffeine you feel in the next half hour, while Lion's Mane is studied over weeks of use.

What it doesn't do

Worth being clear, because this ingredient gets oversold.

L-theanine won't stop caffeine wearing off. The taper still happens, it just tends to feel like a slope rather than a step. If you're expecting the energy to last longer, that's not what the pairing does.

It also won't make a caffeine dose safe that wasn't already. Theanine may take the edge off, it doesn't neutralise a high dose. If 300mg of caffeine makes you feel awful, adding theanine won't fix that, and the sensible move is less caffeine rather than more of something else.

And if caffeine genuinely doesn't agree with you, this pairing isn't a workaround. Some people are better off without stimulants entirely, and there's no shame in being one of them.

FAQ

Does L-theanine cancel out caffeine's effects?

No. In the studies on caffeine combined with L-theanine, people reported feeling more alert than on placebo, not less. What many people notice is a calmer feel than caffeine on its own.

How much L-theanine is in Levelz® gummies?

150mg per serving, paired with 150mg of caffeine. That's a one-to-one ratio.

Can I get L-theanine and caffeine together naturally?

Yes, tea contains both. A cup of green or black tea has very roughly 10mg to 13mg of L-theanine and 30mg to 40mg of caffeine. Coffee and guarana contain caffeine but no meaningful L-theanine.

Do gaming energy drinks contain L-theanine?

Most don't. The classic cans rely on caffeine alone, from added caffeine, coffee or guarana. A few newer formulas add L-theanine, so check the label.

Is the caffeine-theanine combination backed by research?

There's a modest body of it. Small, short studies and a 2014 review of 11 trials found moderate effects on alertness and attention switching in the first two hours. Most tested single doses on lab tasks, not long gaming sessions.

Will L-theanine make me drowsy?

It's generally not described as sedating, and in the studies above the combination raised alertness ratings rather than lowering them.

Why one-to-one rather than more theanine?

Most studies used about twice as much theanine as caffeine, usually with less caffeine than we use. We chose 150mg of each so the theanine sits in the range those studies used, alongside a moderate caffeine dose. It's our formulation choice, not a ratio proven to be best.

In short

Caffeine wakes you up. L-theanine is paired with it to keep that alertness feeling calmer. Levelz® uses 150mg of each. Tea is the natural source of both, while coffee, guarana and most gaming energy drinks give you caffeine alone. It won't extend how long the caffeine lasts and it won't rescue a dose that's too high for you, and the research on the pairing is small and short-term but fairly consistent.

For the other half of our formula, what Lion's Mane is and why it's in Levelz® covers that side of things.

See the full formula on the product pages, and the FAQ page has more on how all eight actives work together.