Skip to content
Flat Rate Shipping Only $6.95 on Any Order Size - and Always FREE for Club Members
Flat Rate Shipping Only $6.95 on Any Order Size - and Always FREE for Club Members
L-theanine Found to Help Reduce Stress and Improve Cognitive Function

L-theanine Found to Help Reduce Stress and Improve Cognitive Function

L-theanine is an amino acid that is found in green and black teas. A new study suggests that it may help reduce stress and improve cognitive function.

Thirty adults with an average age of 48 and no major psychiatric illness participated in the study. The participants took 200 mg/day of L-theanine or a placebo for four weeks. They switched interventions after a 2-week washout period.

The researchers assessed depression, anxiety, and sleep quality via the Self-rating Depression Scale, the State-Trait Anxiety Inventory, and the Pittsburgh Sleep Quality Index.  Cognitive function was assessed using the Trail-Making Test and the Stroop test. The assessments took place at baseline, 4 weeks, 6 weeks, and 10 weeks.

Participants had improvements in Pittsburgh Sleep Quality Index scores for sleep latency and daytime dysfunction while taking the L-theanine, compared to while taking the placebo. They also used less sleep medication. Anxiety and self-reported depression decreased while taking the L-theanine.

Verbal fluency and executive functions scores improved after taking L-theanine for 4 weeks. They biggest improvements were seen in participants who had poorer baseline cognitive function.

The study was conducted by researchers from the National Center of Neurology and Psychiatry, Tokyo. It was published on October 3, 2019 in the journal Nutrients.

Previous article Study Finds High Dose of Blueberry Polyphenols May Improve Cognitive Performance

Related Posts

Study Finds High-Intensity Interval Training Benefits Older Adults
Study Finds High-Intensity Interval Training Benefits Older Adults
High-intensity interval training (HIIT) workouts generally combine short...
Read More
Study Finds Constipation More Prevalent During Pregnancy
Study Finds Constipation More Prevalent During Pregnancy
Constipation typically occurs during pregnancy due to an increase in the...
Read More
More Screen Time Associated With Less Healthy Lifestyle
More Screen Time Associated With Less Healthy Lifestyle
The proliferation of smartphones, tablets, and tv-connected devices in r...
Read More

Join Us for Subscriber Only Offers, Product Announcements, and Health News You Can Use!

×