L-Theanine helps you relax and stay focused, delivering calm clarity with a trusted UK brand behind it, manufactured to strict GMP standards. The star ingredient is L-Theanine, a natural nootropics component, with green tea extract for antioxidant support, and a vegan friendly formula protected by careful fermentation and strict quality controls Lamberts upholds.

Available Sizes & Variants:

60 tablets – convenient daily dose for steady calm and focus.

Benefits & Features:

• Calm focus when you need it most.
• Supports relaxed mood with clear thinking during busy days.
• What really makes this a strong nootropics choice is the star ingredient L-Theanine, which promotes neurotransmitter balance to help reduce anxiety and support sustained attention without heaviness or jitters.
• Green tea extract adds natural antioxidant support for everyday resilience.
• Designed for daily use by vegans and vegetarians, with careful fermentation for purity.

From the Lamberts stable, this l theanine supplement is a UK brand with a long heritage of pharma grade quality, produced in the UK to strict GMP standards and vegan friendly. A careful fermentation process ensures purity, while green tea extract adds natural EGCG (up to 5mg). The star ingredient L-Theanine supports relaxation and balanced mood, and is linked with immune support via γδ T-cell activity and antioxidant properties.

L-Theanine, Calcium Carbonate Cellulose Tablet Coating (Hydroxypropyl Methylcellulose Colour: Titanium Dioxide Glycerin) Silicon Dioxide Stearic Acid Magnesium Stearate.

• GTIN: 5055148414016
• Manufacturer: Lamberts
• Categories: L-Theanine Supplements & TabletsLambertsNew ArrivalsNootropics SupplementsSleep & Relaxation SupplementsStress Relief & Calming SupplementsSupplements for Anxiety
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Take one tablet daily with a meal. Suggested daily intake is one (1) softgel with food or as directed by a medical practitioner.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: L-Theanine

L-Theanine is an amino acid that occurs naturally in tea and contributes to a sense of calm and focus. This form is a vegan-friendly, non-protein amino acid often derived through fermentation processes used in supplement production.

In this product the active ingredient is presented as L-Theanine, sometimes alongside supporting ingredients such as green tea extract and minerals that complement its profile.

What Does L-Theanine Do?

L-Theanine participates in the production of brain neurotransmitters including GABA, serotonin and dopamine, supporting normal psychological function. It is also involved in immune function through stimulation of gamma-delta T-cell proliferation and exhibits antioxidant properties to help manage oxidative stress. These actions align with EFSA and NHS guidance on normal body function.

This information reflects the described mechanisms and is provided to illustrate how L-Theanine contributes to overall physiological balance.

This product is not intended to diagnose, treat, cure, or prevent any disease.

When choosing a partner for L-Theanine, the commitment to manufacturing excellence and thorough quality governance drove our pick of Lamberts. This brand rests on UK-based production that sticks to strict Good Manufacturing Practice and is approved by the UK Department of Health, highlighting a long-standing reputation for reliability and safety in supplement making.

Third-party validation comes via their clearly documented adherence to high-quality control measures, ensuring purity and efficacy across products. The formulation shows careful attention to vegan and vegetarian suitability and uses a meticulous fermentation process to back product integrity.

Our endorsement comes from a thorough evaluation by our team of medical experts here at Welzo, paired with a structured assessment of adherence to our quality certification process, which you can explore via our quality certification process. This mix of manufacturing prowess, regulatory alignment, and transparent quality practices made Lamberts the standout pick for this L-Theanine formulation, aligning perfectly with Welzo’s standards and the needs of this supplement.