l-theanine
L-Theanine is an amino acid found primarily in tea leaves that promotes relaxation without sedation. It increases alpha brain waves, enhances focus when combined with caffeine, and supports calm, clear-headed mental states.
Lab Notes — Research Studies
01 l-Theanine: An astounding sui generis integrant in tea
L-theanine offers potential health benefits including anti-stress and neuroprotective effects with modulation of anti-neoplastic agents.
View Study ((ScienceDirect))02 L-Theanine and Immunity: A Review
L-theanine enhances immune function, reduces immunosuppression, and serves as an immunomodulator for inflammation management.
View Study ((MDPI))03 l-Theanine Activates the Browning of White Adipose Tissue Through the AMPK Axis and Ameliorates Diet-Induced Obesity
L-theanine triggers white adipose tissue browning and reduces diet-induced obesity by enhancing thermogenesis.
View Study ((American Diabetes Association))04 l-Theanine reduces psychological and physiological stress responses
L-theanine intake decreases stress responses through inhibition of cortical neuron excitation during acute stress.
View Study ((ScienceDirect))05 L-theanine: an astounding sui generis amino acid in poultry nutrition
L-theanine demonstrates antioxidant, growth-promoting, immune-boosting, and anti-stress benefits in poultry applications.
View Study ((ScienceDirect))06 L-theanine relieves symptoms in patients with schizophrenia: an 8-week, randomized, double-blind study
L-theanine augmentation of antipsychotic therapy improves positive, activation, and anxiety symptoms in schizophrenia.
View Study ((Journal of Clinical Psychiatry))07 l-Theanine regulates glucose, lipid, and protein metabolism via insulin and AMP-activated protein kinase signaling
L-theanine regulates metabolism in rats through insulin and AMPK signaling mechanisms.
View Study ((Royal Society of Chemistry))08 Psychotropic effects of L-theanine and its clinical properties
L-theanine demonstrates promising therapeutic potential for managing anxiety disorders and stress.
View Study ((ScienceDirect))09 L-theanine in the adjunctive treatment of generalized anxiety disorder
L-theanine showed limited efficacy for anxiety reduction but may improve sleep satisfaction in those with insomnia symptoms.
View Study ((ScienceDirect))10 An overview of biological production of L-theanine
Bacterial enzymes demonstrate potential for producing L-theanine for human health and food applications.
View Study ((ScienceDirect))Formula — Benefits & Dosage
⚗️ Effects
- Caffeine Synergy: Most popular use is with caffeine for focused energy.
- Fast Acting: Effects typically felt within 30-60 minutes.
- Consistent Results: Reliably produces calming effects.
💉 Dosage & Administration
- Typical Range: 100-400mg daily.
- With Caffeine: Common ratio is 2:1 (L-theanine:caffeine).
- For Sleep: 200-400mg 30-60 minutes before bed.
⚠️ Side Effects
- Extremely Safe: Very few side effects reported.
- Possible Drowsiness: At high doses, some may feel sleepy.
- Lower Blood Pressure: May slightly reduce blood pressure.
- Drug Interactions: Minimal; generally safe with most substances.
📦 Availability & Sourcing
- Widely Available: Found in almost all supplement stores.
- Very Affordable: One of the most cost-effective nootropics.
- Multiple Forms: Capsules, powder, and in many pre-made stacks.
Reaction Log — User Experiences
Widely praised for its calming effects without drowsiness. The combination with caffeine is a popular starting nootropic stack. Very well-tolerated with minimal side effects.
Synthesis — Related Compounds
⚠️ IMPORTANT DISCLAIMER
This information is for educational and research purposes only. l-theanine may not be approved for human use. Always consult a qualified healthcare professional before using any supplements or research compounds. We do not guarantee accuracy or completeness of information presented.