Supplements / Conditional
L-Theanine
Best for: Stress, Sleep, Cognitive performance
L-Theanine is rated limited evidence (tier C on our evidence scale). Modest daily dose, often used acutely for stress or before sleep wind-down. Use in the late afternoon or evening for sleep contexts.
Sources last reviewed
When and how to take L-Theanine
- Dose
- Modest daily dose, often used acutely for stress or before sleep wind-down.
- Timing
- Use in the late afternoon or evening for sleep contexts.
- Review
- Reassess after 2 to 4 weeks.
- Forms
- suntheanine, standardized l-theanine
What L-Theanine is used for
- Small but real signal for acute stress reduction without sedation.
- Generally well tolerated, but not a treatment for clinical anxiety.
When Almavivo suggests L-Theanine
- If you reported elevated daily stress: studied for acute stress response and perceived calm.
- If you flagged trouble falling asleep: studied for subjective relaxation before sleep.
- If you reported poor focus: studied for attention quality when paired with caffeine.
- If you flagged stress-induced fog or task-switching trouble: studied for calmer attention and working memory under load.
What to look for when buying L-Theanine
- Preferred third-party verification: Third-party tested (COA).
- Common contamination risks: Mislabeling / identity.
- Form: Suntheanine or comparably verified L-theanine preferred over generic 'theanine' blends.
Where to get it
We’re building a curated list of third-party-tested products for L-Theanine. Each one will meet our quality bar (preferred certifications, contamination screens) and carry an explicit affiliate disclosure.
Your experience
If you’ve tried L-Theanine, you can log how it went. This stays on your device — only you see it.
We frame these as personal experience, not medical claims. Self-reported subjective outcomes are influenced by placebo, regression to the mean, and parallel lifestyle changes. We’ll never present ratings as equivalent to RCT evidence.
Research sources for L-Theanine
- L-theanine for stress and anxiety: systematic review (reviewed 2026-04-30)
Related supplements
Almavivo is for education only, not medical advice. Check with a doctor or pharmacist before starting a supplement, especially if you take prescription medicine, are pregnant or breastfeeding, or have a long-term health condition.