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

Order a box, ₱549 All eight ingredients

Green tea leaves beside L-theanine powder

In every 21 g sachet

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 L-Theanine is in the cup

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 the studies discuss

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

Questions people ask

What does L-theanine do when it is paired with coffee?

L-theanine is the amino acid found naturally in green tea. Research on the caffeine and L-theanine pairing has looked at attention and alertness, and people often describe the combination as a smoother, steadier kind of energy than coffee alone. We describe what the studies discuss; we do not promise how you will feel.

How much L-theanine and caffeine is in one sachet?

Each sachet is 21 g of medium roast Arabica blend. The exact L-theanine and caffeine figures come from the certificate of analysis for the batch, and we publish them on this page as each batch is released. Arabica naturally carries less caffeine than Robusta, so expect a gentler lift than a Robusta 3-in-1.

Is L-theanine safe to take every day?

L-theanine has been studied at daily amounts and is sold on its own as a supplement in the Philippines. We are a coffee, not a clinic: one sachet is one serving, and if you are pregnant, breastfeeding, on medication or managing a condition, ask your doctor before adding anything to your routine, coffee included.

All 20 questions →