# L-theanine Stress Markers Randomized Trial: What the Evidence Says
Canonical: https://www.migaku.app/guides/l-theanine-stress-markers-randomized-trial-evidence-review
Category: evidence-review
Summary: L-theanine Stress Markers Randomized Trial has 2 source documents in the current Migaku evidence database. The strongest available sources in this first pass 
Last reviewed: 2026-06-27
Reviewed by: Migaku Evidence Review
# L-theanine Stress Markers Randomized Trial: What the Evidence Says

## Quick Answer

L-theanine Stress Markers Randomized Trial has 2 source documents in the current Migaku evidence database. The strongest available sources in this first pass are mixed biomedical and public-health sources, so conclusions should be framed as evidence-aware guidance rather than medical advice.

## Key Takeaways

- This page is generated only from sources stored in the Migaku evidence knowledge base.
- Current evidence mix: 1 narrative review, 1 preclinical study.
- Claims should be interpreted with the source type, study design, population, and publication date in mind.
- This article is educational and does not replace care from a qualified clinician.

## Evidence Map

| Source | Evidence type | Level | Date | Identifier |
| --- | --- | ---: | --- | --- |
| Matcha as a Source of Bioactive Compounds: A Review of Health-Promoting Properties and Potential Applications | narrative review | 3 | 2026-05-19 | 10.3390/nu18101613 |
| Phytochemical and Fungal Bioactive Compounds in the “Brain Health Triad”: A Narrative Review on Neurostimulating, Neurotrophic, and Neuroprotective Synergy | preclinical study | 4 | 2026-04-18 | 10.3390/ijms27083607 |

## What The Sources Report

- It was once most popular in Japan; however, in recent years, its use in the food industry has increased significantly. [Sławińska Paulina (2026); evidence level 3]
- Numerous recipes featuring matcha can be found online, and many cafés now offer various flavored versions of this beverage. [Sławińska Paulina (2026); evidence level 3]
- Under normal conditions, it is sequestered in the cytoplasm by Kelch-like ECH-associated protein 1 (Keap1), which targets it for degradation. [Cipriano Giovanni Luca (2026); evidence level 4]
- The following subsections provide a detailed analysis of the molecular profiles and clinical evidence for these three primary bioactives. [Cipriano Giovanni Luca (2026); evidence level 4]

## How To Read This Evidence

Evidence level 1 generally reflects systematic reviews or meta-analyses. Level 2 includes randomized trials, guidelines, or public-health guidance. Level 3 usually reflects observational or narrative-review evidence. Level 4 is weaker or early-stage evidence. The level is a sorting aid, not a final quality grade.

## Practical Interpretation

For l-theanine stress markers randomized trial, the current source set is useful for orientation, but it is not yet broad enough for strong claims. Use cautious language and keep conclusions close to the cited sources.

## Limits Of This First Pass

This is a small-batch MVP article. It uses the first ingested sources for this topic and should be expanded with more targeted searches, license review, and human editorial checks before being treated as a definitive review.

## References

- Sławińska Paulina (2026). Matcha as a Source of Bioactive Compounds: A Review of Health-Promoting Properties and Potential Applications. DOI: 10.3390/nu18101613. PMCID: PMC13209849. PMID: 42197072. License: CC BY 4.0. https://pmc.ncbi.nlm.nih.gov/articles/PMC13209849/
- Cipriano Giovanni Luca (2026). Phytochemical and Fungal Bioactive Compounds in the “Brain Health Triad”: A Narrative Review on Neurostimulating, Neurotrophic, and Neuroprotective Synergy. DOI: 10.3390/ijms27083607. PMCID: PMC13116414. PMID: 42074246. License: CC BY 4.0. https://pmc.ncbi.nlm.nih.gov/articles/PMC13116414/

## Safety Note

Health information can change, and individual risk depends on medical history, medications, pregnancy status, age, and diagnosis. Talk with a qualified clinician before changing treatment, supplement, or medication routines.