L-theanine Cognition Randomized Trial: What the Evidence Says

Quick Answer

L-theanine Cognition Randomized Trial has 2 source documents in the current Migaku evidence database. The strongest available sources in this first pass are systematic review, 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 systematic review, 1 research article.
• 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

What The Sources Report

• For risk of bias assessment, the Cochrane Risk of Bias Tool (version 2.0) was used. [Mátyus RO (2025); evidence level 1]
• Background: Green tea ( Camellia sinensis ) has been consumed for centuries, and its beneficial effects on human health have been studied in recent decades. [Mátyus RO (2025); evidence level 1]
• Purpose: We hypothesised that cognition following consumption of an isomaltulose beverage would be comparable to that of an isoenergetic sucrose-based beverage, but the latter would attenuate post-ingestive metabolic responses. [Bloomfield PM (2026); evidence level 4]
• Methods: Thirty adults (15 males, 15 females) aged 21-44 years completed three experimental sessions, following at least 3 h fasting. [Bloomfield PM (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

There is at least one systematic-review style source in the current set, so it deserves more weight than single-study evidence. For l-theanine cognition randomized trial, the next editorial step is to add more targeted sources and separate strong findings from early or indirect evidence.

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

• Mátyus RO (2025). Promising, but Not Completely Conclusive-The Effect of l-Theanine on Cognitive Performance Based on the Systematic Review and Meta-Analysis of Randomized Placebo-Controlled Clinical Trials.. DOI: 10.3390/jcm14217710. PMCID: PMC12609247. PMID: 41227106. https://pmc.ncbi.nlm.nih.gov/articles/PMC12609247/
• Bloomfield PM (2026). Isomaltulose-Based Stimulant Beverages Can Improve Postprandial Metabolic Responses Without Compromising Cognitive Benefits Associated with Caffeinated Energy Drinks.. DOI: 10.3390/nu18071163. PMCID: PMC13074367. PMID: 41978213. https://pmc.ncbi.nlm.nih.gov/articles/PMC13074367/

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.