The Effect of the Amino Acid L-Theanine on Alertness and Vigilance

The Effect of the Amino Acid L-Theanine on Alertness and Vigilance

The amino acid l-theanine (the active ingredient in green tea) is considered to have a calming effect without causing sleepiness. This study evaluates whether l-theanine affects blood pressure, heart rate, alertness, and sense of well-being.

Inclusion Criteria:

• adult
• able to swallow capsule

Exclusion Criteria:

• none