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  • How are reviewers describing this item?
    great, good and better.
  • Our engine has profiled the reviewer patterns and has determined that there is minimal deception involved.
  • Our engine has determined that the review content quality is high and informative.
  • Our engine has detected that Amazon has altered, modified or removed reviews from this listing. We approximate total reviews altered up to 495.
  • Our engine has discovered that over 80% high quality reviews are present.
  • This product had a total of 265 reviews as of our last analysis date on Jan 9 2020.


Most positive reviewquestion

I don't consume any type of caffeine without taking L-Theanine along with it - and this brand has been great!

Least positive reviewquestion

Returning customer!

Most authentic reviewquestion

BRI seems to be of just as good quality as other more expensive brands. This is my first order of l-theanine from them, maybe i...  Read More

Least authentic reviewquestion

Not enough review data to provide meaningful insight.

Helpful Insights


    Posted by a reviewer on Amazon

    It lasts about 3 hours before wearing off.

    Posted by a reviewer on Amazon

    Already see a diff ce after only a week.

    Posted by a reviewer on Amazon

    I have chronic insomnia, but wake very early no matter how much sleep i've had, so mornings can been rather miserable for me.

    Posted by a reviewer on Amazon

    If you found my review to be useful, please let me know by clicking the “yes” or “helpful” button.

    Posted by a reviewer on Amazon

    So i was not sure this stuff would work but based on the reviews i bought it.

    Posted by a reviewer on Amazon

    The bottle is not as shiny as the illustration might indicate, so it loses a point for that marketing nonsense.

Review Count History
Price History