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  • L-Theanine Capsules from Green Tea Extract - 400 mg High Strength | 120 Capsules Packshot
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L-Theanine Capsules from Green Tea Extract - 400 mg High Strength | 120 Capsules

L-Theanine Capsules from Green Tea Extract - 400 mg High Strength | 120 Capsules

High-strength L-theanine capsules - 400 mg of L-theanine from natural green tea extract rather than from synthetic production.

  • 400 mg L-theanine per daily dose (2 capsules) - from 666 mg green tea extract (Camellia sinensis, leaves), standardised to 60% L-theanine
  • Natural source: L-theanine straight from the tea leaf - 200 mg per capsule, clearly declared
  • Only 20 mg EGCG per daily dose - transparently stated and far below the EU limit of 800 mg
  • Vegan & free from unnecessary additives - plant-based HPMC capsule, rice flour is the only carrier
  • Lab-tested quality from Austria - every batch checked
  • 120 capsules = 60 days - 2 capsules daily with a meal, PZN 20996527

19,95 €
33,25 € 100g
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L-Theanine Capsules from Green Tea Extract - 400 mg High Strength | 120 Capsules

L-Theanine - the amino acid from the tea leaf

  • L-theanine (γ-glutamylethylamide) is a non-proteinogenic amino acid that occurs in nature almost exclusively in the tea plant Camellia sinensis, a member of the tea family (Theaceae). It was first described in 1949 in Japanese green tea.
  • In the tea leaf, L-theanine is the most abundant free amino acid and shapes the umami taste of green tea. A cup of green tea provides around 8-30 mg of L-theanine (Hidese et al., 2019) - the daily dose of 400 mg therefore corresponds arithmetically to roughly 13 to 50 cups.
  • Tea has been drunk in China and Japan for centuries - today, L-theanine is one of the most thoroughly studied constituents of the tea plant: its absorption and metabolism have been examined pharmacokinetically in human studies (van der Pijl et al., 2010; Scheid et al., 2012).

Green tea extract with 60% L-theanine - natural rather than synthetic

  • Green Naturals L-Theanine capsules contain L-theanine from natural green tea extract (Camellia sinensis, leaves) at 400 mg per daily dose - compared with many manufacturers that use synthetically or enzymatically produced L-theanine.
  • The extract is standardised to 60% L-theanine: 666 mg of extract provide 400 mg of L-theanine - compared with many suppliers that declare green tea extracts without a defined L-theanine content.
  • L-theanine from capsules and from green tea has been compared directly: in a randomised crossover study with 12 healthy participants, the kinetics of uptake and metabolism were comparable after both forms of intake (Scheid et al., 2012). In a further human study, the maximum plasma concentration was measured after around 50 minutes (van der Pijl et al., 2010).

400 mg high strength - transparent down to the EGCG content

  • Green Naturals L-Theanine contains 400 mg of L-theanine per daily dose and 200 mg per capsule - compared with many products that make do with 100 to 250 mg per daily dose. In human studies, L-theanine is frequently examined at 200 mg per day (Hidese et al., 2019) - this corresponds to one capsule.
  • The EGCG content is stated separately: 20 mg of epigallocatechin gallate per daily dose, far below the limit of 800 mg per day that applies to green tea extracts in the EU (Regulation (EU) 2022/2340). There are currently no authorised health claims for L-theanine according to EFSA.
  • 120 vegan capsules per tub last for 60 days - a 2-month supply at 2 capsules daily, manufactured and lab-tested in Austria.
L-Theanine Capsules from Green Tea Extract - 400 mg High Strength | 120 Capsules
L-Theanine Capsules from Green Tea Extract - 400 mg High Strength | 120 Capsules

  • Best time to take

    Please take 2 capsules daily with sufficient liquid with a meal. Whether you take them in the morning or in the evening is up to you - the important point is not to take the capsules on an empty stomach.

  • Dosage and duration of use

    Daily dose: 2 capsules (= 666 mg green tea extract with 400 mg L-theanine and 20 mg EGCG). The pack of 120 capsules lasts for 60 days. For adults only; not for pregnant or breastfeeding women or for children and adolescents under 18 years of age. Do not take if you are consuming other products containing green tea on the same day. Do not exceed the recommended daily dose.
Quality in focus. Find out what sets Green Naturals® L-Theanine apart in terms of raw material source, standardisation and laboratory testing.
Quality criterion Green Naturals® Other manufacturers
Raw material source ✔ natural green tea extract (Camellia sinensis, leaves) rather than synthetic L-theanine ✕
Standardisation ✔ 60% L-theanine, 666 mg extract = 400 mg L-theanine ✕
Sensible dosage ✔ 400 mg per daily dose, 200 mg per capsule ✕
EGCG transparency ✔ 20 mg EGCG stated, far below the EU limit of 800 mg ✕
Purity & laboratory testing ✔ every batch lab-tested ✕
Formulation & tolerability ✔ vegan HPMC capsule, rice flour as the only carrier ✕
Transparency & responsibility ✔ clear notes on pregnancy, age and intake ✕
Origin & practicality ✔ manufactured in Austria, 120 capsules = 60 days ✕

Our vision at Green Label® is to create products based on purity and transparency. Our approach is to source high-quality raw materials directly from leading producers worldwide to offer a product that is uncompromisingly committed to natural ingredients. Every capsule of our products carries the promise of purity, sustainability, and maximum effectiveness:

  • Premium active ingredients as pure substances, directly from leading producers.
  • Production and bottling under the highest pharmaceutical standards (GMP, ISO 22000:2018, HACCP).
  • Maximum avoidance of all additives; only valuable natural substances are used.
  • Vegan capsule shells, 100% free of PEG and other undesirable substances.
  • Packaging in environmentally friendly, non-toxic materials for optimal aroma protection.

My name is Dr. Hari Sven Krishnan, founder of Heilpflanzenwohl GmbH and chief pharmacist.

Together with an experienced team of specialists, including Stephan Walz (pharmacist), Marie Schröder (nutritional scientist), and Dr. Christiane Gras (immunologist), we developed Green Naturals.

The result of intensive research with a clear goal: to offer you natural, highly effective products. At Heilpflanzenwohl, quality and purity come first, because we are convinced: "The best medicine comes from nature – we just need to learn how to use it correctly."

Food supplement based on green tea extract
Ingredients: Green tea extract (Camellia sinensis, leaves, containing 60% L-theanine), coating agent: hydroxypropyl methylcellulose (plant-derived); rice flour.
Ingredients 2 capsules / day *NRV %
Green tea extract 666 mg **
• of which L-theanine 400 mg **
• of which epigallocatechin gallate (EGCG) 20 mg **
* NRV % = Nutrient Reference Values according to Regulation (EU) No 1169/2011
** no reference available
Recommended Use: Daily dose: 2 capsules (= 666 mg green tea extract with 400 mg L-theanine and 20 mg EGCG). The pack of 120 capsules lasts for 60 days. For adults only; not for pregnant or breastfeeding women or for children and adolescents under 18 years of age. Do not take if you are consuming other products containing green tea on the same day. Do not exceed the recommended daily dose.
Notes: Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Do not exceed the stated recommended daily dose. Keep out of reach of young children. Store in a cool, dry place protected from light. For adults only. Should not be consumed by pregnant or lactating women and children below 18 years old. Should not be consumed if you are consuming other products containing green tea on the same day. Should not be consumed on an empty stomach. Do not consume a daily amount of 800mg of (−)-epigallocatechin-3-gallate or more. Contains a desiccant sachet (silica gel) to protect against moisture. Not suitable for consumption.
Net quantity ℮: 60,0 g

What is L-theanine?

L-theanine (γ-glutamylethylamide) is a non-proteinogenic amino acid that occurs in nature almost exclusively in the tea plant Camellia sinensis. It is the most abundant free amino acid in the tea leaf and shapes the umami taste of green tea. In food supplements, L-theanine is either produced synthetically or - as here - obtained from green tea extract.

What is L-theanine good for?

L-theanine is one of the most frequently studied constituents of the tea plant and is mostly used in human studies at 100 to 200 mg per day (Hidese et al., 2019). However, there are currently no authorised health claims for L-theanine according to EFSA. For this reason we make no promises about effects, and instead tell you transparently about origin, content and the state of research.

What does L-theanine do in the body?

After intake, L-theanine is rapidly absorbed from the intestine and enters the bloodstream. According to current research, it is broken down in the body into ethylamine and glutamic acid and excreted in the urine (Scheid et al., 2012). The underlying mechanisms are the subject of ongoing research (Li et al., 2022) - there are currently no authorised EFSA claims for L-theanine.

How long does L-theanine take to work?

The pharmacokinetics of L-theanine have been well studied: in human studies, the maximum concentration in blood plasma was measured around 50 minutes after intake, and the elimination half-life was about 65 minutes (van der Pijl et al., 2010). These figures describe absorption into the body - they do not constitute a statement about any effect.

When should you take L-theanine - morning or evening?

Please take 2 capsules daily with sufficient liquid with a meal. Whether you take the capsules in the morning or in the evening is your own choice. The only important points are that you do not take the product on an empty stomach and do not consume any other products containing green tea on the same day.

How much L-theanine per day?

The recommended daily dose is 2 capsules. They provide 666 mg of green tea extract with 400 mg of L-theanine, i.e. 200 mg of L-theanine per capsule. In human studies, L-theanine is frequently examined at 200 mg per day (Hidese et al., 2019). The stated daily dose must not be exceeded.

How much L-theanine is in green tea?

Depending on the variety and preparation, a cup of green tea contains around 8 to 30 mg of L-theanine (Hidese et al., 2019). The daily dose of 400 mg of L-theanine therefore corresponds arithmetically to roughly 13 to 50 cups. A standardised extract provides this amount in 2 capsules and with a consistent content of 60% L-theanine.

Is L-theanine dangerous?

L-theanine has been consumed through tea for centuries. This product is subject to the notices required for green tea extracts: for adults only, not for pregnant or breastfeeding women or under-18s, not on an empty stomach and not together with other green tea products on the same day. Please keep to the daily dose of 2 capsules and speak to your doctor beforehand if you have a pre-existing condition or are taking medication.

Where does the L-theanine in the capsules come from?

The L-theanine comes from a green tea extract that is obtained from the leaves of Camellia sinensis and standardised to 60% L-theanine. Many products, by contrast, contain synthetically or enzymatically produced L-theanine. In a human study, the kinetics of L-theanine from capsules and from green tea were comparable (Scheid et al., 2012).

What does the EGCG notice on the tub mean?

Green tea extracts naturally contain epigallocatechin gallate (EGCG). In the EU, a limit of less than 800 mg per day applies to it, together with mandatory notices on the label (Regulation (EU) 2022/2340). Green Naturals L-Theanine contains 20 mg of EGCG per daily dose and is therefore far below this limit. The notices are nevertheless printed in full on the tub.

Can you open the capsules?

Yes. The vegan HPMC capsule can be opened; the contents can be stirred into yoghurt or a drink, for example. Even then, please make sure you take the powder with a meal and not on an empty stomach. The simplest way is to take the capsule whole with sufficient liquid.

Is the product completely natural?

Yes. The capsules contain only green tea extract from the leaves of Camellia sinensis, rice flour as a natural carrier and a plant-based capsule shell made of hydroxypropyl methylcellulose (HPMC). The ingredients list therefore has three entries - free from colourings, preservatives and flavourings, and completely vegan.

Is the product suitable during pregnancy?

No. The product should not be consumed by pregnant or breastfeeding women or by children and adolescents under 18 years of age. It is intended exclusively for adults. This notice is mandatory for food supplements containing green tea extract and is also printed on the label.

Can you buy L-theanine capsules in a pharmacy?

Yes, in Germany: Green Naturals® L-Theanine with 120 capsules is listed under PZN 20996527, a German pharmacy product number, and can be ordered from German mail-order and local pharmacies. Quoting the PZN there ensures that exactly this product with 400 mg of L-theanine from green tea extract is ordered. The capsules are also available directly from our online shop.

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Sources

  1. Scheid, L. et al. (2012). Kinetics of L-theanine uptake and metabolism in healthy participants are comparable after ingestion of L-theanine via capsules and green tea. The Journal of Nutrition, 142, 2091-2096.
  2. van der Pijl, P.C., Chen, L. & Mulder, T.P.J. (2010). Human disposition of L-theanine in tea or aqueous solution. Journal of Functional Foods, 2. DOI: 10.1016/j.jff.2010.08.001
  3. Li, M.-Y. et al. (2022). L-Theanine: A Unique Functional Amino Acid in Tea (Camellia sinensis L.) With Multiple Health Benefits and Food Applications. Frontiers in Nutrition, 9, 853846. DOI: 10.3389/fnut.2022.853846
  4. Hidese, S. et al. (2019). Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial. Nutrients, 11(10), 2362. DOI: 10.3390/nu11102362

Remarks

  1. HACCP (Hazard Analysis and Critical Control Points) is a preventive system for ensuring food safety that identifies and assesses potential hazards in production and minimizes them through targeted control measures. The seal refers to the manufacturing process.
  2. This is how the grade is calculated: Grade calculation based on star ratings: 5.00 - 4.50 Very good, 4.49 - 3.50 Good, 3.49 - 2.50 Satisfactory, 2.49 - 1.50 Sufficient, 1.49 - 1.00 Poor. For the verification of ratings, no authenticity check of customer reviews is carried out. The ratings are combined from different sources, such as mail-order pharmacies and online marketplaces. Last updated: 19.10.26