L-Theanine Powder

Buy L-Theanine Powder Online

L-Theanine is a naturally occurring amino acid found predominantly in tea leaves. It is widely studied for its ability to promote a relaxed state without pronounced sedation and has been investigated for stress, sleep, attention, and cognitive performance.

Product Information

Human clinical trials have evaluated L-Theanine at doses ranging from 200 to 400 mg/day. Recent meta-analytic evidence involving 31 randomized trials found measurable effects on certain stress and cognitive outcomes, although the overall clinical significance varies between studies.

How It Works

L-Theanine influences several neurotransmitter and brain-wave pathways and may promote a relaxed but alert mental state. Its effects appear different from conventional sedatives because it does not primarily act as a direct GABA receptor agonist.

POTENTIAL BENEFITS

1. Supports Relaxation

L-Theanine has been extensively studied for its ability to promote relaxation during periods of psychological stress. Controlled human research has reported reductions in several stress-related measures.

2. Supports Attention

Research has identified potential improvements in attention and reaction-time measures, particularly following acute administration. A 2026 meta-analysis found an improvement in choice reaction time following a 200 mg dose.

3. Supports Sleep Quality

Human trials have reported improvements in selected sleep measures, including sleep latency and sleep disturbance, particularly in individuals experiencing stress.

4. Calm Cognitive Performance

L-Theanine's appeal comes from its potential to support mental performance without the strongly stimulating profile associated with caffeine or traditional stimulants. This makes it particularly interesting for stress-sensitive cognitive performance.

Dosage

Human studies have commonly evaluated 200 mg/day, while other controlled trials have used 400 mg/day. The appropriate amount depends on the formulation and intended use.

Side Effects

L-Theanine is generally well tolerated in clinical studies. Mild headache, gastrointestinal symptoms, dizziness, or drowsiness may occur in some individuals.

References

1. Hidese S, et al. Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial. Nutrients. 2019;11(10):2362. PMID: 31623400. PubMed
2. Moulin M, et al. Safety and Efficacy of AlphaWave L-Theanine Supplementation for 28 Days in Healthy Adults with Moderate Stress. Neurol Ther. 2024;13(4):1135-1153. PMID: 38758503. PubMed

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