Product Reviews
L-Theanine Supplements Review

Reviewed and edited by Tod Cooperman, M.D. Tod Cooperman, M.D.
 Initial Posting: 8/8/15 Last Update: 5/12/20
L-Theanine Supplements reviewed by

Find the Best L-Theanine Supplement

Find Out If L-Theanine Helps for Stress and Which Products Are Best

Alphabetical list of L-theanine supplement brands compared in this review
Bluebonnet L-Theanine NOW L-Theanine Double Strength Swanson Ultra Suntheanine
Country Life L-Theanine Puritan's Pride L-Theanine Thorne Research Theanine
GNC L-Theanine Solgar L-Theanine TwinLab L-Theanine Dots
Jarrow Formulas L-Theanine 200 Source Naturals L-Theanine Vitamin World L-Theanine
Life Extension L-Theanine    
Bluebonnet L-Theanine Country Life L-Theanine GNC L-Theanine Jarrow Formulas L-Theanine 200 Life Extension L-Theanine NOW L-Theanine Double Strength Puritan's Pride L-Theanine Solgar L-Theanine Source Naturals L-Theanine Swanson Ultra Suntheanine Thorne Research Theanine TwinLab L-Theanine Dots
Make sure the L-theanine supplement you take passed our test and is right for you!
Isn't your health worth it?

L-theanine, an amino acid found in tea leaves, is often promoted to reduce stress and for use in a variety of conditions including ADHD, but does it really work? In this report, reviews the evidence for this supplement, explains how L-theanine is used and, most importantly, shows you which L-theanine supplements are high-quality, provide the right dose for your needs, and offer the best value. We found, for example, that you can get the same, high-quality L-theanine for nearly one-third the price of other supplements if you choose the right product. Be aware that the suggested dosing on products may much higher or lower than you want.

You must join to see the full review and test results for L-theanine supplements along with recommendations and quality ratings. You'll get test results and quality ratings for 8 supplements selected for review by, plus 4 others which passed the same tests through's voluntary, Quality Certification Program. Plus, you'll learn:

    • Which L-theanine supplements failed testing and which passed
    • Differences in the marketed forms of L-theanine
    • The best L-theanine supplements at the lowest cost
    • The dosage of L-theanine taken for different applications and the related clinical evidence
    • Potential side effects and drug interactions of L-theanine supplements
    • Tips for buying and using L-theanine, and more!

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