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L-theanine – Promote Relaxation and Reduce Stress

L-theanine is an amino acid that helps promote a restful, relaxed state without diminishing daytime alertness.* Its free of the side effects commonly associated with other relaxing agents and can be used to aid in stress management.

During a study of human volunteers, L-theanine promoted the generation of alpha brain waves, an indication of relaxation.* Another small, controlled clinical trial suggests that L-theanine supports a healthy stress response.* Results of yet another human trial suggest that L-theanine may act via the sympathetic-medullary system, either in addition to or instead of the hypothalamic-pituitary-adrenal axis.* L-theanine has long thought to interact with the binding of L-glutamic acid to glutamate receptors in the brain.*

Yokogoshi H, Kobayashi M, Mochizuki M, Terahima T. Neurochemical Res. 1998;23:667–73.
Juneja L, Chu D, Okubo T, Nagato Y, Yokogoshi H. Trends in Food Sci Tech. 1999;10:199–204.
Ito K, Nagato Y, Aoi N, et al. Nippon Nogeikagaku Kaishi 1998;72:153–7.
Kimura K, Ozeki M, Raj Juneja L, Ohira H. Biol Psych. 2007;74(1):39–45.
Yoto A, Motoki M, Murao S, Yokogoshi H. J Physiol Anthropol. 2012 Oct 29;31:28.

Servings Per Container: 60 

Take 1 capsule two or three times daily. If additional support is desired, increase to 2 capsules three times daily, or as recommended by your healthcare professional.


Serving Size: 1 Veg Capsule

Amount Per Serving
L-Theanine ... 100mg
(Suntheanine® brand)

Other Ingredients: cellulose, vegetable capsule (modified cellulose), and magnesium stearate

L-Theanine Does Not Contain

  • artificial coloring
  • artificial flavoring
  • corn
  • dairy products
  • gluten
  • ingredients of animal origin
  • preservatives
  • salt
  • soy
  • sugar
  • wheat
  • yeast

Suntheanine®, a patented form of L-Theanine, is a registered trademark of Taiyo International, Inc.