Quick Reference
- Scientific Rating
-
4.6/ 5.0
- Primary Mechanism
- Modulates Alpha brain waves; increases GABA and Dopamine
- Standardized Form
- Pure L-Theanine or Suntheanine® (patented form)
L-theanine is an amino acid found almost exclusively in tea leaves, most notably green tea, and is one of the few compounds shown to promote relaxation without inducing drowsiness. Its proposed mechanism involves increasing alpha brain wave activity, a pattern associated with a state of calm, wakeful relaxation, while also modestly influencing GABA, serotonin, and dopamine levels. This unique profile has made it a common pairing with caffeine, where it is used to smooth out the jittery, anxious effects some people experience from stimulants while preserving focus. L-theanine is generally well tolerated even at higher intakes, with a safety profile that differs notably from sedative compounds.
Table of Contents
Clinical Summary
A non-protein amino acid primarily found in tea leaves. It promotes a state of relaxed alertness and is highly synergistic with caffeine, effectively smoothing out the "jitters" while sustaining focus.
Dosage Guidelines
100-200mg daily. Most effective when taken in a 2:1 or 1:1 ratio with caffeine (e.g., 200mg L-Theanine to 100mg Caffeine).
Safety & Side Effects
Extremely well-tolerated. Very high doses may cause mild headaches or drowsiness in isolated cases.
Known Interactions
May mildly lower blood pressure; use caution when combined with antihypertensive drugs or excessive alcohol.
Scientific References
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Medical Disclaimer
The information provided in this clinical review is for educational and informational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment.
*These statements have not been evaluated by the Food and Drug Administration (FDA). This product or ingredient is not intended to diagnose, treat, cure, or prevent any disease.
Always consult your physician or other qualified health provider with any questions you may have regarding a medical condition, or before beginning any new diet, fitness, supplement, or treatment regimen, especially if you have pre-existing medical conditions or are taking prescribed medications.
