BCCT plans to write a summary on L-theanine. While our summary is in development, you can visit About Herbs: L-Theanine

L-theanine is a water soluble amino acid found in green tea and in mushrooms.


The About Herbs summary of L-Theanine highlights several cautions, contraindications and herb-drug interactions. See summary for more information. This summary also advises that “patients undergoing chemotherapy should discuss the use of L-theanine with their physicians because these [anticancer] effects are not based on clinical trials, and epigallocatechin-3-gallate (EGCG) in green tea reduces activity of the chemotherapy drug bortezomib.” 


BCCT does not recommend therapies or doses, but only provides information for patients and providers to consider as part of a complete treatment plan. Patients should discuss therapies with their physicians, as contraindications, interactions and side effects must be evaluated.

Dosage recommendations are available from these sources:

Integrative Plans, Protocols and Medical Systems

For more information about plans and protocols, see our Integrative Plans and Protocols page.
  • Plans, protocols and programs
    • Alschuler & Gazella complementary approaches: stress relief1
    • Block program2
      • Combination stress hormone supplement
      • Coupler to improve effectiveness of chemotherapy (Adriamycin)
      • Combination formula to strengthen cancer-killing effects of conventional treatment
  • Traditional systems

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