L-theanine supplements may improve sleep quality and reduce the time it takes to fall asleep. Doses studied by researchers ...

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 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 ...

L-theanine is an amino acid naturally found in tea leaves. First linked to tea’s calming effects in the 1940s, it is now sold as a supplement for stress relief, focus and better sleep. Research into ...

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 ...

If you’re waking at 3am with a mind that won’t quiet down, or taking longer than you’d like to drift off at night, you’re not alone. Sleep patterns shift as we age, and many people find themselves ...

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 ...