Supplement$39.95◆ Editor's Pick

L-Theanine - Momentous 200 mg

Name: L-Theanine - Momentous 200 mg
Brand: crrnt.app
Price: 39.95 USD
Availability: InStock

I take mine 30-60 minutes before bed and that's where it actually earns its spot in my routine. No morning grogginess, just an easier time turning my brain off. One capsule (200mg) is the full dose. L-Theanine is a naturally occurring amino acid found in tea leaves that promotes calm, focused mental states without causing drowsiness. It works by increasing alpha brain wave activity and supporting neurotransmitters like GABA and serotonin, helping you stay relaxed yet alert. Would work for day time too.

@LZ·just now·via crrnt.app

Visit source →

May be an affiliate link, see footer.

Upvotes

Verified

Comments

Evidence

5/5

Multiple RCTs show L-theanine reduces anxiety and improves attention, particularly when combined with caffeine. A meta-analysis of randomized trials found consistent benefits for relaxation and cognitive performance. The mechanism is established and human trial evidence is solid, though effect sizes are modest.

Mechanism

L-theanine is an amino acid found in tea that crosses the blood-brain barrier and increases alpha-wave brain activity and GABA (gamma-aminobutyric acid) signaling, promoting relaxation without sedation. It may also modulate glutamate neurotransmission and enhance dopamine release, supporting calm focus.

Best evidence type

Randomized trial

Sources

Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.Nutrients · 2019 · RCT
“This randomized, placebo-controlled, crossover, and double-blind trial aimed to examine the possible effects of four weeks L-theanine administration on stress-related symptoms and cognitive functions in healthy adults.”
The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review.Plant foods for human nutrition (Dordrecht, Netherlands) · 2020 · Systematic review
“Author information: (1)Faculty of Health, University of Canberra, Canberra, ACT, 2601, Australia.”
Green tea effects on cognition, mood and human brain function: A systematic review.Phytomedicine : international journal of phytotherapy and phytopharmacology · 2017 · Systematic review
“BACKGROUND: Green tea (Camellia sinensis) is a beverage consumed for thousands of years.”
Effects of L-theanine-caffeine combination on sustained attention and inhibitory control among children with ADHD: a proof-of-concept neuroimaging RCT.Scientific reports · 2020 · RCT
“We examined the acute effects of L-theanine, caffeine and their combination on sustained attention, inhibitory control and overall cognition in boys with attention deficit hyperactivity disorder (ADHD).”

Caveats

Most studies use doses of 100–200 mg and measure acute effects; long-term safety and efficacy data are limited. Some trials show minimal benefit in non-anxious populations. The combination with caffeine is better-studied than L-theanine alone. Individual response varies widely.

✓

Tried it? Verify this find to help others know it works. Members can verify, free to join.

0 comments

Be the first to comment.

EOD publishes opinions and summaries of research about supplements, services, and protocols. It is not medical advice. Consult a qualified healthcare provider before changing your supplement, exercise, sleep, or medication regimen.

Some outbound links on EOD are affiliate links. If you buy through them we may earn a small commission, at no extra cost to you. It never influences what we publish or how it's ranked. Full disclosure.

EOD · 123 Placeholder Street, New York, NY 10001

END OF DAY · MMXXVI

L-Theanine - Momentous 200 mg

0 comments

One of these every Sunday.