Doctor's Best Suntheanine L-Theanine


Suntheanine®, L-Theanine 150mg 90VC

Suitable for Vegetarians


  • Science-based nutrition
  • Dietary supplement
  • Promotes a relaxed state without drowsiness*
  • Eases stress and everyday nervous tension*
  • Promotes a positive mood and alertness*


Suntheanine® L-Theanine contains 100% Suntheanine®, a patented pure form of the amino acid L-theanine produced in Japan from green tea leaves. This award-winning brand of theanine has been the subject of numerous safety studies and human clinical trials. One of green tea’s natural health-promoting compounds, L-theanine (y-glutamylethylamide) is synthesized in the roots of tea plants and transported to the leaves, comprising about 2% of the total dry weight of green tea leaves. It is the ingredient that is responsible for both the taste and the relaxing effects of green tea. Research shows that supplemental L-theanine crosses the blood-brain barrier within 30 minutes of intake and thus is able to exert its effects directly on the brain.


Suggested Adult Use: Take 1 capsule daily, away from food, or as directed by a health care professional.

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