Pure Encapsulations

L-Theanine (Suntheanine®)

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The Promise

What this is — pure Suntheanine® L‑theanine calming amino acid

A concentrated L‑theanine product using the Suntheanine® brand.

Single, research-used ingredient

Contains L‑theanine as the sole active ingredient, provided at a clinical dose per capsule.

Standardized ingredient form

Uses Suntheanine®, a branded L‑theanine produced by enzymatic fermentation.

Vegetarian delivery

Supplied in vegetable capsules with hypo‑allergenic plant fiber to complete capsule volume.

Daily‑use friendly

Formulated for daily use and labeled for divided dosing to fit regular routines.

Why It Works

How it works — formulation facts ingredient details

Clear formulation details explain the dose, form, and supporting features.*

01

Clinically referenced dose per capsule*

Each capsule provides 200 mg of L‑theanine.

02

Free‑form amino acid source

L‑theanine is the most abundant free‑form amino acid in tea leaves and is supplied here in that free form.

03

Branded, fermented production

Suntheanine® L‑theanine is produced via enzymatic fermentation rather than extracted directly from leaf.

04

Non‑pharmaceutical excipients

Capsules use cellulose and hypo‑allergenic plant fiber rather than animal gelatin.

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Customer Reviews

Your Journey

How to use it — practical directions serving and safety

Simple instructions and precautions to fit this into daily routines.

Serving

Follow the recommended range

Take 1–6 capsules per day in divided doses.

Timing

Between meals

Take each dose between meals as directed to match suggested use.

Format & storage

Vegetarian capsules

Product comes in vegetable capsules; store as you would other supplements.

Precautions

Pregnancy and drowsiness note

Consult your physician if pregnant or lactating; higher doses may cause drowsiness in some people.

Product education

L-Theanine (Suntheanine®) – Theanine, is a unique amino acid, found in green tea, this clinically researched product is great for everyday stress relief and management. L-Theanine, enhances the production of alpha-waves in the brain, the brain waves responsible for calming and relaxation. Safe to use daily, will not cause drowsiness and can often moderate the effects of caffeine. This is a great product for women who suffer from PMS symptoms as it helps to calm the mind and nervous system.*

About Suntheanine® brand L-Theanine

Green tea has been recognized for centuries as having relaxant properties. l-Theanine, a unique amino acid derived from tea, provides the characteristic taste of green tea. l- Theanine has also been discovered as the biologically active constituent of green tea responsible for promoting relaxation. In a preliminary non-clinical study, an l-theanine solution enhanced alpha wave production in the occipital and parietal regions of the brains of volunteers. These observed patterns are considered to be an index of relaxation. Furthermore, it did so rapidly and without causing drowsiness. In two additional studies, alpha waves were also shown to be detectable soon after l-theanine administration. Theanine is also useful for supporting healthy cellular function. Preliminary research suggests that l-theanine may be helpful for premenstrual support including healthy attitude. Furthermore, theanine has been reported to moderate the effects of caffeine on the central nervous system. l-Theanine’s safety is supported in studies and by its long history of safe consumption in tea. Pure Encapsulations l-Theanine is Suntheanine®, the brand which has been used in scientific studies.*

L-Theanine: What Is It?

l-Theanine is a natural component of green tea that is responsible for its characteristic taste. l-Theanine is also believed to be the component in green tea responsible for its relaxation effects.*

Uses For l-Theanine

Relaxation Support: Preliminary clinical evidence shows an increase in alpha brain wave activity after theanine administration. Alpha waves are an indication of an alert/relaxed mental state.*

Premenstrual Support: In a clinical test, theanine provided both mental and physical support for women, including moderation of occasional irritability and stress.*

Nervous System Support: l-Theanine moderates the effects of caffeine on the central nervous system. It has also been shown to support healthy neurotransmitter function.*

What Is The Source?

l-Theanine is the most abundant free-form amino acid found in tea leaves. Suntheanine® l-Theanine is produced from enzymatic fermentation. Hypo-allergenic plant fiber is derived from pine cellulose.

Suntheanine® is a registered trademark of Taiyo International, Inc.

How To Use L-Theanine (Recommendations)

Pure Encapsulations recommends 1-3 capsules daily, in divided doses, between meals. Each capsule contains 200 mg L-theanine.

Are There Any Potential Side Effects Or Precautions?

If pregnant or lactating, consult your physician before taking this product. Higher doses in some people may cause drowsiness; however lower doses are not associated with this effect.

Are There Any Potential Drug Interactions?

At this time, there are no known adverse reactions when taken in conjunction with medications.

Supplement record

Review serving details and ingredients for this product.

Supplement Facts:
Suggested Use: 1-6 capsules per day, in divided doses, between meals.
Each vegetable capsule contains:
Ingredients AMT %DV
L-theanine (Suntheanine®) 200 mg -
Other Ingredients: vegetarian capsule (cellulose, water),Hypo-allergenic plant fiber (cellulose) added to complete capsule volume requirement
(-) There is no %DV or the manufacturer has not provided this data.