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Pure Encapsulations - L-Theanine (Suntheanine)

Pure Encapsulations - L-Theanine (Suntheanine)

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Info: 60 Veg. Capsules

Originally found in green tea (in relatively small doses), L-Theanine is a unique type of amino acid which turns out to be a biologically active compound capable of promoting relaxation without inducing drowsiness during the day, and also promoting a more restful sleep at night. It acts by regulating neurotransmitter activity in the brain and decreasing cortisol levels in the face of stress. L-Theanine has also been reported to help moderate the effects of caffeine on the central nervous system. Pure Encapsulations L-Theanine is a registered brand of pure, consistent quality called Suntheanine, which has been used in clinical studies.

Product Notes:

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

Suntheanine is not an extract of green tea, but rather is produced via a patented fermentation process that mimics the natural process in green tea leaves, resulting in a 100% pure L-isomer-theanine

Supporting Science:

Dodd FL, Kennedy DO, Riby LM, and Haskell-Ramsay CF. "A double-blind, placebo-controlled study evaluating the effects of caffeine and L-theanine both alone and in combination on cerebral blood flow, cognition and mood." Psychopharmacology (Berl). 2015; 232(14): 2563–76. PMCID: PMC4480845

Lyon MR, Kapoor MP, Juneja LR. "The effects of L-theanine (Suntheanine®) on objective sleep quality in boys with attention deficit hyperactivity disorder (ADHD): a randomized, double-blind, placebo-controlled clinical trial." Altern Med Rev. 2011 Dec;16(4):348-54. PMID: 22214254.


Each capsule contains: 200 mg l-Theanine

Non-medicinal ingredients: Hydroxypropyl methylcellulose, purified water, hypoallergenic plant cellulose.

All Pure Encapsulations ingredients are GMO free. They obtain statements from each of their suppliers certifying that the ingredients do not contain GMOs, and for some nutrients, they conduct their own PCR testing to confirm the absence of genetically modified material.

Suggested Usage:

Adults: Take 1 capsule daily. Store sealed in a cool, dry area.


Keep out of reach of children. Health Canada Natural Product Number: 80017548.

UPC / Barcode: 766298009995