Life Extension L-Theanine capsules help you feel relaxed and a bit more focused, thanks to pure Suntheanine, and Life Extension's commitment to quality.

Available Sizes & Variants:

60 capsules – everyday calm support in a simple handy capsule form.

Benefits & Features:

• Promotes calmer focus throughout the day.
• The key active ingredient Suntheanine is the patented form that delivers calming effects with the pure L-theanine in each capsule, helping you manage stress while staying productive.
• Independently verified production confirms purity and excludes inferior isomers, ensuring you receive the pure L-theanine form.
• Designed for daily use with flexible dosing to suit daytime alertness or evening relaxation.
• Quality and trust come from Life Extension's long standing premium line; Suntheanine is a patented, pure form that the company independently verifies to ensure you get the real deal every time.

Life Extension has built a reputation as a science led premium supplement maker with international reach. This L-Theanine uses Suntheanine, the patented, pure form that has earned trust in clinical research and is independently verified for purity. The product is designed for daily use, offering a calm, focused feeling without harsh stimulants. Packaging and quality standards reflect Life Extension's commitment to transparency and consistency, so you know you’re getting a reliable, well made supplement you can reach for when you need a steady mood and clear head. Trusted by customers worldwide. Quality you can feel. For a broader wellness routine, some people pair this with a vitamin d supplement.

L-Theanine, L-Theanine

• GTIN: 737870168362
• Manufacturer: Life Extension
• Categories: Best SellersL-Theanine Supplements & TabletsLife ExtensionNootropics SupplementsSleep & Relaxation SupplementsStress Relief & Calming SupplementsSubscribe & Save ProductsSupplements 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 to two vegetarian capsules daily, preferably with food. Store in a cool, dry place away from direct sunlight and out of reach of children. Do not exceed the recommended dose. Consult your healthcare practitioner if pregnant, nursing, or taking prescription medications.

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.

L-Theanine is an amino acid you find naturally in tea leaves that slips into the brain to help a calm, relaxed vibe.

This formula uses Suntheanine, the patented pure L-Theanine form proven in studies to be safe and different from other less tested forms.

What Does L-Theanine Do?

L-Theanine helps promote relaxation and a balanced mental state to support daily wellbeing and focus.

It supports brain activity and neurotransmitter balance, contributing to a sense of calm that can help with daytime alertness and evening relaxation without promising specific medical outcomes.

This product isn’t meant to diagnose, treat, cure, or prevent any disease.

Life Extension has built a solid reputation as a premium supplement maker with a global footprint, powered by a commitment to clinically studied ingredients and scientific rigour. This brand shines for its use of Suntheanine, the patented pure L-theanine form, and for carrying out independent lab verification to confirm the exact L-theanine content. This steadfast focus on a dependable, verified ingredient aligns with our purity and potency standards, and it helps the trust customers place in Life Extension products grow. The mix of a solid track record and a clear emphasis on quality control makes Life Extension a standout partner in our portfolio.

For this particular supplement, Life Extension provides 100mg of pure L-theanine per capsule, allowing flexible dosing while keeping consistent with the validated, patented form trusted by clinicians. This product-specific fit sits well with our emphasis on safety, transparency, and reproducible results. This brand was assessed by our medical team for compliance with the standards we enforce.