L-Theanine for longevity
Grade AAmino acid from green tea that induces relaxed-but-alert focus by elevating alpha brain waves, with excellent synergy with caffeine.
78/100 Evidence Strength
Why L-Theanine matters for longevity
Amino acid from green tea that induces relaxed-but-alert focus by elevating alpha brain waves, with excellent synergy with caffeine.
- Calm, focused attention without sedation
- Reduces caffeine-induced jitters and blood pressure spikes
- Modest improvement in sleep quality
- Lower subjective stress under cognitive load
Typical dose
100–200 mg with caffeine, or 200–400 mg alone
Best timing
With morning caffeine, or 30–60 min before bed for sleep
Evidence grade
Grade A 78/100
Mechanism of action
Crosses the blood-brain barrier; increases GABA, serotonin, and dopamine; promotes alpha-wave activity associated with calm focus; modulates glutamate signaling.
Dosage & Timing
Typical
100–200 mg with caffeine, or 200–400 mg alone
Range
50–600 mg
Timing
With morning caffeine, or 30–60 min before bed for sleep
With Food
Not required
Form
Capsule, powder, or naturally present in matcha/green tea
Category
Cognition
Reported Benefits
- Calm, focused attention without sedation
- Reduces caffeine-induced jitters and blood pressure spikes
- Modest improvement in sleep quality
- Lower subjective stress under cognitive load
Side Effects
- Generally none at standard doses
- Headache (rare)
Contraindications
- No clinically significant contraindications
Known Interactions
AntihypertensivesMinor additive blood-pressure lowering.
StimulantsReduces stimulant side effects — generally beneficial.
References
L-Theanine — Frequently Asked Questions
Common questions about dose, benefits, side effects and longevity use of L-Theanine.
What is the typical dose of L-Theanine?+
100–200 mg with caffeine, or 200–400 mg alone (range 50–600 mg). With morning caffeine, or 30–60 min before bed for sleep. Food not required.
How does L-Theanine work in the body?+
Crosses the blood-brain barrier; increases GABA, serotonin, and dopamine; promotes alpha-wave activity associated with calm focus; modulates glutamate signaling.
What are the longevity benefits of L-Theanine?+
Amino acid from green tea that induces relaxed-but-alert focus by elevating alpha brain waves, with excellent synergy with caffeine. Reported benefits include: Calm, focused attention without sedation; Reduces caffeine-induced jitters and blood pressure spikes; Modest improvement in sleep quality; Lower subjective stress under cognitive load.
What are the side effects of L-Theanine?+
Generally none at standard doses; Headache (rare) Avoid in: No clinically significant contraindications.
What is L-Theanine commonly stacked with for longevity?+
Caffeine (2:1 theanine:caffeine ratio), Magnesium glycinate, Lion's Mane.
Comparison vs Alternatives
All Supplements →| Attribute | L-TheanineThis page | Creatine Monohydrate | Lion's Mane |
|---|---|---|---|
| Evidence | Grade A78/100 | Grade A94/100 | Grade B61/100 |
| Category | Cognition | Cognition | Cognition |
| Best for | Calm, focused attention without sedation | Strength and lean mass | Improved cognitive scores in mild cognitive impairment (small Japanese RCT) |
| Typical dose | 100–200 mg with caffeine, or 200–400 mg alone | 5 g daily | 1 g dual-extract daily |
| Timing | With morning caffeine, or 30–60 min before bed for sleep | Any time of day, consistent | Any time, with or without food |
| Form | Capsule, powder, or naturally present in matcha/green tea | Micronized powder | Dual-extract (water + ethanol) capsule or powder — single-extract products are notably weaker |
| Action | Current page | View → | View → |