L-theanine is a natural supplement that slows brain waves to improve relaxation and sleep quality. Absorption takes about 30-60 minutes, and it stays in your system for about five hours. Take ...

Daniel Combs, MD, is an Assistant Professor of Pediatrics and Medicine at the University of Arizona. Melatonin may improve sleep quality better than L-theanine, and there is stronger research evidence ...

L-theanine can promote relaxation at any time of day. L-theanine is a compound commonly found in tea leaves, including green, black, white, and oolong teas. The best time to take L-theanine depends on ...

Emmanuella Ogbonna is a licensed pharmacist, health writer, and medical researcher. L-theanine is a natural supplement that slows brain waves to improve relaxation and sleep quality. Absorption takes ...