Swanson Suntheanine L-Theanine is a dietary supplement that helps you relax and stay calm focused, thanks to the patented Suntheanine L-Theanine, a pure form of the amino acid from green tea. The star ingredient Suntheanine L-Theanine supports a calm mood and reduces stress. Swanson uses GMP certified facilities and independent third party testing to ensure potency and purity, so it’s a handy daily helper.

Available Sizes & Variants:

60 vcaps – convenient monthly supply of l theanine supplements.

Benefits & Features:

• Promotes relaxation and steady focus daily.
• Calm mood is supported by Suntheanine L-Theanine, a patented form known for calming effects.
• Daily use helps maintain a clear focus without sedation during demanding tasks.
• Manufactured in GMP certified facilities, a hallmark of our natural supplements, with independent third party testing to ensure potency and purity.
• Suntheanine L-Theanine delivers a predictable calm onset within minutes, helping you stay productive during busy days, maintain steady focus under pressure, and keep stress from spiralling.

Swanson Suntheanine L-Theanine brings a calm, focused vibe to everyday life. The patented Suntheanine L-Theanine comes from green tea and has been studied for relaxation without sedation. Swanson runs GMP certified facilities and partners with independent labs to check potency and purity, ensuring each capsule delivers consistent support. The vegetarian capsule makes it easy for both vegetarians and vegans to enjoy a natural supplement that fits a mindful routine. This wellness approach sits well with a routine that includes probiotics for gut health, you know.

Suntheanine L-Theanine, Suntheanine L-Theanine

• GTIN: 87614021102
• Manufacturer: Swanson
• Categories: L-TheanineNootropicsSleep & Relaxation SupplementsStress Relief & Calming SupplementsSupplements for AnxietySwanson
• 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.

As a dietary supplement, take one veggie capsule one to two times per day with water before meals. Store in a cool, dry place out of reach of children. Consult your doctor before use if you are pregnant, nursing, taking medication, or have a medical condition. Do not exceed the recommended daily dose.

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

*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Active Ingredient Is: L-Theanine (Suntheanine)

L-Theanine is a natural amino acid found in tea that supports relaxation and a calm mental state. This form, Suntheanine, is a patented, pure L-Theanine used in supplement form and sourced from green tea.

This ingredient contains Suntheanine as the active component, with supporting ingredients limited to the capsule materials and stabilisers as listed in product information. The aim is to provide a standardised, high‑quality source of L-Theanine for its relaxing properties.

What Does L-Theanine Do?

L-Theanine helps promote a relaxed mood and can support a calm mental state without sedation, in line with EFSA‑aligned and NHS‑recognised discussions of normal cognitive function. Dr. Hidese of Jichi Medical University found that Suntheanine supports relaxation and attention under stress.

It plays a role in normal brain function and stress processing, contributing to everyday emotional balance as part of a healthy lifestyle.

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

This brand rests on stringent facility standards and a clear commitment to quality, which is why we decided on Swanson as our trusted partner for Suntheanine L-Theanine. Their GMP certified facilities and use of independent third‑party laboratories show a longstanding dedication to purity and potency, aligning with Welzo’s expectations for safe, reliable supplements.

The manufacturer’s testing approach sits central in our decision. Swanson states that every wellbeing supplement undergoes purity and potency testing in collaboration with independent labs, backing a transparent process that backs consistent label accuracy and safety. This emphasis on rigorous testing is a cornerstone of why we teamed up with them and is supported by our own quality stance the certifications we require.

Swanson’s heritage as a dedicated supplement maker, their focus on a patented ingredient like Suntheanine L‑theanine, and their well-established industry standing distinguish them from other brands. This product’s fit with our focus on calm mood support and focused attention in non‑sedative formats further clarifies our choice. Our collaboration rests on the expertise of our team of medical experts and a mutual commitment to quality across every stage of manufacture.