Calm focus

L-Theanine

L-theanine is an amino acid found almost only in tea leaves (Camellia sinensis) and a few mushrooms. Japanese researchers first isolated it from green tea in 1949. It is the most-studied pairing partner for caffeine: nearly every published trial tests the two together, which is exactly how it shows up in a cup of Joe's Blend.

Attention tasksAlpha brain wavesCaffeine pairing

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Green tea leaves beside L-theanine powder

In every 21 g sachet

L-theanine is an amino acid from tea leaves that researchers almost always study alongside caffeine. Trials have measured attention, reaction time and EEG alpha activity when L-theanine and caffeine are taken together. Joe's Blend pairs it with Arabica caffeine; we describe what the studies measured, not what it will do for you.

Found in

Green and black tea leaves, and the bay bolete mushroom. Grown across Asia.

Studied for

Attention and reaction-time tasks, EEG alpha activity, subjective alertness when taken with caffeine

In your sachet

Listed on the label. The milligrams per sachet will be published here from the client's formulation sheet.

Why we use it

Why is L-Theanine in your coffee?

Coffee alone can feel spiky. The trials on L-theanine nearly all test it next to caffeine, so it is the natural partner for a coffee that wants to feel steady. It is tasteless at these amounts, so the cup still tastes like coffee.

The most-studied caffeine partner
Tasteless in the cup
In Japanese green tea for centuries

The research

What does the research on L-Theanine say?

Peer-reviewed papers you can read yourself. We describe what they measured, never what will happen to you.

The effects of L-theanine, caffeine and their combination on cognition and mood.Haskell CF, Kennedy DO, Milne ALBiological psychology, 2008PubMed →The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness.Giesbrecht T, Rycroft JA, Rowson MJNutritional neuroscience, 2010PubMed →L-theanine, a natural constituent in tea, and its effect on mental state.Nobre AC, Rao A, Owen GNAsia Pacific journal of clinical nutrition, 2008PubMed →

Education, not advice. Joe's Blend is coffee, not medicine, and carries no approved therapeutic claims. If you have a condition or take medication, talk to your doctor before adding anything new to your day.

FAQ

L-Theanine questions people ask

What does L-theanine do in coffee?

It is the amino acid most studied next to caffeine. Published trials have looked at attention and alertness when caffeine and L-theanine are taken together. We report what the research measured and make no health claims.

Does L-theanine stop coffee jitters?

People often describe the caffeine-and-L-theanine combination as feeling steadier than coffee alone, and researchers have studied the pairing, but results vary by person. Joe's Blend makes no promise about how you will feel.

Is L-theanine safe to take with caffeine?

The two are studied together in most L-theanine trials. As with any ingredient, if you are pregnant, have a health condition or take medication, ask your doctor before adding it. This page is education, not medical advice.

How much L-theanine is in Joe's Blend?

L-theanine is listed on the label, and the milligrams per sachet will be published here from the formulation sheet. Trials usually study L-theanine alongside caffeine rather than one fixed dose.

Is L-theanine the same as the amino acid in green tea?

Yes. L-theanine is found almost only in tea leaves (Camellia sinensis) and was first isolated from green tea in 1949. It is the same compound, added here to coffee.

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