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Natural Awakenings Milwaukee Magazine

L-Theanine for Stress Reduction and Cognitive Function

Mar 01, 2023 12:00AM ● By Jack Cincotta
Stress and cognitive decline are highly relevant issues in modern society. L-theanine has been used for many years in traditional medicine to improve mental well-being. L-theanine is an amino acid found in green tea leaves that has been shown to increase brain wave activity associated with a calm, alert state of mind.

A study published in the Current Developments in Nutrition Journal investigates the effects of L-theanine supplementation on stress and cognitive function. Researchers conducted a randomized, double-blind crossover study on adults with non-clinical psychiatric symptoms. They gave participants either a placebo or 200 milligrams of theanine for four weeks, followed by a two-week washout period, and then continued the crossover study (in which participants were switched treatments).

The researchers found that theanine supplementation led to significant decreases in stress and significant improvements in sleep quality and cognitive function compared to the placebo.

While more research is needed to elucidate the benefits of theanine in clinical populations, this supplement appears to be effective for reducing stress and improving brain function in the general population. This is likely enhanced when coupled with a healthy diet and lifestyle practices, such as meditation and regular exercise.

Jack Cincotta, AADP Board-Certified Holistic Health Practitioner and AFPA-Certified Holistic Health Coach, is located at N4147 W. Water St., Sullivan. For more information, call 920-650-7674, email [email protected] or visit