L-Theanine 200 mg - 90 Veg Caps
L-Theanine 200 mg - 90 Veg Caps
L-Theanine 200 mg - 90 Veg Caps
L-Theanine 200 mg - 90 Veg Caps
L-Theanine 200 mg - 90 Veg Caps
L-Theanine 200 mg - 90 Veg Caps
LifeSource Vitamins
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L-Theanine 200 mg - 90 Veg Caps

Original Price: $24.99   Current Price: $24.99
  • Supports relaxation & calm wellness*
  • Supports cognitive function & clarity*
  • Supports stress response & balance*
  • Supports mood balance & emotional wellness*
  • Supports focus & mental performance*
  • Provides 200 mg L-theanine per capsule*
  • Third-Party Tested for Purity & Quality*

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L-Theanine 200 mg - 90 Veg Caps

L-Theanine is a naturally occurring amino acid commonly found in green tea leaves and is valued for its ability to support relaxation without promoting drowsiness. It is often used to help encourage a calm, balanced mood during times of occasional stress while also supporting mental focus and clarity. L-Theanine may help promote a sense of relaxation while allowing you to remain alert and attentive, making it a popular choice for daily wellness support, work-life balance, and mindfulness routines. This vegetarian-friendly formula delivers 200 mg of L-Theanine per serving in an easy-to-take veggie capsule designed to fit seamlessly into your daily supplement regimen.*

See below for more information

 Promotes Relaxation & Stress Relief*

LifeSource Vitamins L-Theanine delivers 200 mg of pure L-Theanine in a vegetarian capsule to promote calm, help manage stress, and support mental clarity. Crafted in FDA-registered, GMP-certified facilities and 3rd-party tested for identity, potency & purity.*

Research-Driven & Verified Product.
Explore the clinical research, ingredient science, and global evidence supporting this product below.
Research Promise: At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is supported by human clinical studies indexed in the National Institutes of Health (NIH) via PubMed, with full texts available in the National Library of Medicine (NLM) PubMed Central (PMC) when available. In addition, we reference reviews from 39 leading health organizations and insights from 20 top global universities to ensure our guidance aligns with credible science.*

Clinically Studied Benefits

✓ Promotes relaxation (calm without drowsiness) — increased alpha brain-wave activity associated with relaxed alertness (human EEG study).* NIH/PubMed — Nobre, 2008

✓ Helps manage everyday stress & anxiety — reduced subjective tension and moderated physiological stress responses in lab stress tasks (including BP reactivity in high responders).* NIH/PubMed — Kimura, 2011

✓ Supports attention & mental performance — improved attention/task performance; synergistic effects when co-administered with caffeine observed in controlled trials.* NIH/PubMed — Owen, 2008

✓ Supports mood & emotional well-being — supplementation improved anxiety and depressive symptom scores in healthy adults (RCT).* NIH/PubMed — Hidese, 2017

✓ May improve sleep quality in select populations — benefits reported in stressed adults and pediatric ADHD (clinical trials).* NIH/PubMed — Lyon, 2011

✓ May enhance attention/focus — emerging evidence for attention support (alone or with caffeine) in demanding tasks (review).* NIH/PMC — Baba, 2021

✓ May counter caffeine jitters — co-administration with caffeine reduced jitteriness while maintaining performance (RCT).* NIH/PubMed — Rogers, 2008

Additional / Promising Evidence

✓ Mechanistic support (neurotransmitters) — modulation of GABA, dopamine, and serotonin pathways underpinning calm alertness (mechanistic; not a clinical outcome alone).* NIH/PubMed — Juneja, 2006

✓ May support cognitive performance under stress — emerging evidence for attention and focus benefits in demanding tasks.* NIH/PMC — Baba, 2021

✓ May improve sleep quality — benefits reported in select populations (e.g., stressed adults).* NIH/PubMed — Lyon, 2011

University-Led & Academic Studies

✓ Relaxed alertness — EEG alpha-wave increases after L-theanine (university study).* NIH/PubMed — Nobre, 2008

✓ Stress reactivity — reduced tension/anxiety and moderated physiologic stress responses (university RCT).* NIH/PubMed — Kimura, 2011

✓ Attention/performance — attention benefits, with synergy when combined with caffeine (controlled trial).* NIH/PubMed — Owen, 2008

Global Evidence & Reviews

✓ Systematic review — stress/anxiety — evidence synthesis supports a role for L-theanine in stress symptom reduction; larger RCTs warranted.* NIH/PubMed — Camfield, 2022

✓ Systematic review — cognition & mood — human studies highlight potential benefits for attention and mood regulation.* NIH/PubMed — Hidese, 2020

✓ Review — sleep/relaxation — narrative/umbrella evidence suggests sleep and relaxation support, population-dependent.* NIH/PubMed — Unno, 2019

We monitor research from the world’s leading institutions — Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge University, Oxford, Stanford, Yale, MIT, the University of Florida, Oregon State University – Linus Pauling Institute, Tufts, Boston University, Cornell, Columbia, and Ohio State — to ensure our guidance remains aligned with the highest standards of credible science.*

Key Ingredients

  • L-Theanine — amino acid from green tea, clinically studied for relaxed alertness and stress support.*

Brief Benefit Bullets

  • Promotes relaxation (calm alertness)*
  • Helps manage everyday stress & anxiety*
  • Supports attention & mental performance (synergistic with caffeine)*
  • Supports mood & emotional well-being*
  • May improve sleep quality in select populations*
  • 3rd-party lab tested for purity & potency

Suggested Use

Take one (1) capsule one to two times daily, preferably between meals, or as directed by a healthcare professional. If pregnant, nursing, taking medications (e.g., antidepressants or sedatives), or have a medical condition, consult your physician.*

Product Specifications

Serving Size — 1 Veg Capsules (200 mg L-Theanine)

Servings Per Container — 90

Form — Capsules

Free From — Non-GMO, gluten-free, vegan*

Quality — Third-party tested for identity, potency & purity

3rd Party Testing: Each batch is independently verified for identity, potency, and purity. Click to view our 3rd-party testing.

LifeSource Vitamins — Proudly American — Since 1992

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

LifeSource Vitamins L-Theanine — 200 mg, 90 Veg Capsules — Promotes Relaxation & Stress Relief* Clinically Studied Ingredients — NIH/PubMed!*

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