There aren't any established standards for L-theanine, but a 2015 review in the Journal of the American College of Nutrition suggests 200 milligrams of L-theanine to ease anxiety, improve sleep ...

L-theanine, an amino acid, is said to enhance concentration, calm the mind, and even improve sleep without causing drowsiness ...

Most people who take l-theanine at doses between 50 and 200mg report a general calming effect within 30 to 40 minutes which may last 8 to 10 hours. Taking l-theanine at a dosage of 200mg once or ...

L-theanine is a low-key supplement that supports calm energy, better sleep, and mental clarity without the crash. Learn how it fits into a high-performance routine without slowing you down.

6. L-Theanine L-theanine is an amino acid found in tea leaves, specifically green tea. It increases GABA in your brain, which can help relieve anxiety, stress, and insomnia symptoms. 12 ...