There are many great effects of l-theanine and I am happy to add it to my daily routine. Definitely recommend to give it a try.

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L-theanine derived from the leaves of green tea, with a purity of 98%. Pure, plant-based and without synthetic additives.
Clearly L-theanine is 98% pure L-theanine from green tea leaves (Camellia sinensis), in a small plant-based capsule. 100 mg per capsule, 60 capsules per pouch.
102 mg of 98% L-theanine, which gives 100 mg L-theanine per capsule and 200 mg per serving of two. The purity is measured by HPLC. Because it is extracted from green tea, a trace of caffeine remains: no more than 0.2%, around 0.2 mg per capsule. A cup of tea holds 20 to 50 mg.
L-theanine is an amino acid that occurs almost only in the tea plant. It is one of the compounds that give tea its soft umami taste. Ours is extracted from green tea leaves and concentrated, not made synthetically.
Nothing. No synthetic additives, no fillers. Vegan, non-GMO, non-irradiated, and tested for heavy metals, pesticides and microbiological purity. Certified halal and kosher.
1 to 2 capsules a day with a glass of water, with or without a meal: L-theanine is water-soluble.
One ingredient: 100 mg L-theanine (98% pure, from green tea) per capsule, in a plant-based capsule. Nothing else: no fillers, colours or artificial additives. Every batch is lab-tested in Europe. Formulated and produced in the Netherlands.
Take 1 to 2 capsules a day with a glass of water, with or without a meal. One pouch holds 60 capsules. Do not exceed the recommended daily dosage; a food supplement is no substitute for a varied, balanced diet.
No health claim about L-theanine is approved in Europe, and none that applies to it is awaiting approval, so this page makes none.
The claims that were submitted about L-theanine were assessed by the European Food Safety Authority and not approved.
What we do say is what is in it: the ingredients and their amounts are under Nutrition & ingredients, the label under Product details.
| Nutrition values: | Per capsule |
|---|---|
| L-theanine (98%) | 100 mg |
| of which caffeine | ≤0.2 mg |

L-theanine derived from the leaves of green tea, with a purity of 98%. Pure, plant-based and without synthetic additives.
30-60 servings · 60 capsules
Naturally derived from the leaves of Camellia sinensis.
A high, consistent concentration of L-theanine.
Less than 0.2% caffeine.
L-theanine in a plant-based capsule. Lab-tested in Europe.
The L-theanine
200 mg · 100 %
L-theanine is an amino acid that naturally occurs almost exclusively in the leaves of the tea plant (Camellia sinensis). Ours is naturally derived from green tea and concentrated to 98% purity, without synthetic additives. Plant-based, virtually caffeine-free and certified halal and kosher.
Amounts per serving (2 capsules), as on the label: 204 mg of 98% L-theanine, which gives 200 mg L-theanine. One capsule gives 100 mg. The label gives no amount for the capsule.
Nutrition labelOne or two capsules a day, with water
Take 1-2 capsules a day
With a glass of water
With or without a meal
Our L-theanine is naturally derived from the leaves of green tea (Camellia sinensis). It isn't a synthetically produced substance, but comes from the same plant as tea.
Our L-theanine has a purity of 98%, measured by HPLC. That's a high, consistent concentration: each capsule contains 100mg of L-theanine. The extract is also non-GMO, non-irradiated and tested for heavy metals, pesticides and microbiological purity.
Only a very small amount: no more than 0.2%. Because the L-theanine is naturally extracted from green tea, a minimal trace of caffeine remains, around 0.2mg per capsule. That's far less than a cup of tea, which typically contains 20–50mg.
Final production always takes place in the Netherlands, so we stay in full control of quality and safety. We source our ingredients directly from the origin, always from specialists who are best at what they do.
For every ingredient, there’s someone in the world who does it better than anyone else, and that’s who we work with. No middlemen. Only trusted suppliers who meet the strictest European standards.
At Clearly, our mission is simple: to keep searching for the #1, and make it available to you.
Because it’s clearly the inside that counts.
No flashy design or misleading labels, just a transparent pouch, so you can see exactly what’s inside. Too often, we buy things because they look or sound good… but inside? Sugar, fillers, or low-quality ingredients.
At Clearly, we do it Clearly: only #1 ingredients you can trust, and a fully transparent formula.
We use mono-material, one single type of plastic, which makes the pouch 100% recyclable. Unlike most packaging that mixes paper and plastic and can’t be properly recycled.
When it comes to health, the inside matters most. That’s Clearly.
Yes. Every ingredient is lab-tested for heavy metals, microbiology, and other potential contaminants.
We only use clean, traceable raw materials from trusted suppliers who meet the highest European safety standards.
If it’s not safe, tested, and the best, it’s not Clearly. We don’t go for "good enough", we go for #1 quality.
We use our own products daily. And just like you, we only want the best. Because if your health is #1, what you take should be too.
If you’re pregnant or breastfeeding, we recommend checking with your doctor before taking any supplement. During this time, both your health and your baby’s health are clearly #1.
There are many great effects of l-theanine and I am happy to add it to my daily routine. Definitely recommend to give it a try.

Ik ben er rustig,helder en ontspannen van.gebruik het meestal als ik thuis ben,lekker chill 😎
Ik was eerst sceptisch of het echt zou doen wat ze beloven. Na veel inlezen en vergelijken toch de l-theanine gekocht en aan mijn tiener dochter gegeven onder het mom van ‘baat het niet, schaadt het niet’ Toen zij in de trein naar haar school zat appte ze me en vertelde ze dat ze voor het eerst sinds tijden gewoon voor zich uit heeft gekeken zonder dat ze perse over vanalles na hoeft te denken! Haar hoofd was kalmer en overzichtelijker. Dit gaf haar zoveel rust!!!! Ze neemt het nu elke ochtend en avond in. Dus ja; het doet echt wat ze beloven!
L theanine van Clearly geeft mij een heldere rust op stressmomenten. Zeker een aanrader! Vooral voor ex rokers.
Love the product and also the size of these capsules. It's very easy to swallow, and I find them quite effective with reducing anxiety, stress, racing thoughts, or general calmness.
What I love about Clearly products is that they don't contain a bunch of fillers. I chose this one because its clean and pure. Love it and take it daily before bed.