L-Theanine
L-theanine is an amino acid found in tea that promotes relaxation without sedation, increasing alpha brain waves. It is most famous for taking the edge off caffeine, producing smooth, focused energy.
Benefits
Promotes calm focus
ModerateIncreases alpha brain-wave activity associated with relaxed alertness.
Reduces stress reactivity
PreliminaryMay lower physiological markers of stress.
Pros & cons
Pros
- Pairs perfectly with caffeine
- Non-sedating relaxation
- Excellent safety
Cons
- Effects are subtle for some
- Best benefits come when stacked
Side effects
Very well tolerated
Side effects are rare even at higher doses.
How to take it
Typical dose
100–200 mg per dose
Timing
With caffeine for focus, or alone in the evening for calm
Common forms
Tip: A common ratio is 2:1 theanine to caffeine (e.g., 200 mg : 100 mg).
What the research says
[1]L-theanine, caffeine, and attention
ModerateThe combination improves attention and reduces task-switching errors more than caffeine alone.
Cognitive trials · 2010PubMed[2]L-theanine and stress
PreliminarySmall studies suggest reduced stress and improved relaxation markers.
Psychology studies · 2019PubMed
How L-Theanine interacts
Synergies, absorption effects, and cautions between L-Theanine and other supplements in the matrix.
L-Theanine and its direct connections · click a node to open its guide
Smooths caffeine's jitters and anxiety while keeping its alertness benefits: the signature pairing.
Compare the pairingTwo calming agents often combined for evening relaxation and sleep.
Compare the pairingL-Theanine balances the arousal from tyrosine, creating a calmer, focused state.
Compare the pairingL-theanine calms mental chatter and melatonin advances sleep timing; together they address both the 'wired mind' and the 'wrong clock' causes of poor sleep onset.
Compare the pairingBoth promote calm focus through GABAergic and inhibitory pathways, complementing each other for relaxation without sedation.
Compare the pairingBoth support calm alertness, but high thiamine doses are rarely needed alongside a balanced B-complex.
Compare the pairingFrequently asked questions
What is L-Theanine used for?
L-Theanine is most commonly used for focus, relaxation, and stress. Increases alpha brain-wave activity associated with relaxed alertness.
How much L-Theanine should I take?
A typical dose is 100–200 mg per dose. A common ratio is 2:1 theanine to caffeine (e.g., 200 mg : 100 mg). Start at the lower end and confirm the right dose for you with a healthcare professional.
When is the best time to take L-Theanine?
Recommended timing: With caffeine for focus, or alone in the evening for calm.
What are the side effects of L-Theanine?
Reported side effects include very well tolerated. Side effects are rare even at higher doses.
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The most-studied performance and cognition supplement.
Compare L-Theanine with
Weighing your options? See how L-Theanine stacks up against similar supplements.
Supports these foundations
L-Theanine can help reinforce these lifestyle foundations, but it works best on top of them, not in place of them.