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, an amino acid found in tea leaves, may improve sleep outcomes by crossing the blood-brain barrier to influence neurotransmitters in the central nervous system and promote brain relaxation.

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 ...

Getting a good night's sleep can feel like an elusive dream for many people, which is why a good supplement is a necessity ...

Administering L-theanine to sleep-deprived mice inhibited hippocampal ferroptosis, a process causing cell death in the brain, according to a study published in Phytotherapy Research. Supplementation ...

Two 2025 studies just made the strongest case yet for L-theanine as a natural sleep aid. AFP via Getty Images A lot of people are quietly rethinking their relationship with melatonin right now. A ...

Can’t sleep? Find out if L-theanine or melatonin is the best option for you. Reviewed by Dietitian Madeline Peck, RDN, CDN L-theanine may help reduce stress, making it easier to fall asleep peacefully ...

Quality sleep is the unsung hero of both physical and mental health. Clocking adequate shut-eye (about seven to nine hours per night) supports everything from a strong immune system to better memory.