Quick Answer
Green Tea Cognitive Function Randomized Trial has evidence relevant to safety, limits, and clinician-discussion contexts, but conclusions should stay close to the cited sources. One representative finding is: Camellia sinensis 1 2 3 4 5 L-theanine is a naturally occurring, water-soluble, non-proteinogenic amino acid that can be found in the tea plantand some mushrooms ().
Key Takeaways
- 01Camellia sinensis 1 2 3 4 5 L-theanine is a naturally occurring, water-soluble, non-proteinogenic amino acid that can be found in the tea plantand some mushrooms (). [Cotter Jack (2026)]
- 02In addition, we examine evidence relating to its safety, consider the limitations of the current literature and highlight key areas for future research. [Cotter Jack (2026)]
- 0313 14 13 14 Table 1 13 15 16 17 18 19 There is growing interest among consumers for products that can help to support aspects of cognitive performance, such as attention, decision-making and memory, as well as associated subjective measures like perceived alertness and mental fatigue. [Cotter Jack (2026)]
- 04It constitutes up to 50% of the total amino acids in tea and accounts for approximately 1–2% of its dry weight, contributing to tea's characteristic umami flavor (,). [Cotter Jack (2026)]
The current Migaku evidence database contains 2 reusable source documents for Green Tea Cognitive Function Randomized Trial. This answer focuses on safety, limits, and clinician-discussion contexts.
- Camellia sinensis 1 2 3 4 5 L-theanine is a naturally occurring, water-soluble, non-proteinogenic amino acid that can be found in the tea plantand some mushrooms (). [Cotter Jack (2026); evidence level 3]
- In addition, we examine evidence relating to its safety, consider the limitations of the current literature and highlight key areas for future research. [Cotter Jack (2026); evidence level 3]
- 13 14 13 14 Table 1 13 15 16 17 18 19 There is growing interest among consumers for products that can help to support aspects of cognitive performance, such as attention, decision-making and memory, as well as associated subjective measures like perceived alertness and mental fatigue. [Cotter Jack (2026); evidence level 3]
- It constitutes up to 50% of the total amino acids in tea and accounts for approximately 1–2% of its dry weight, contributing to tea's characteristic umami flavor (,). [Cotter Jack (2026); evidence level 3]
- 2 [] 3 [] The biological plausibility of the neuroprotective effects of tea drinking is supported by various bioactive properties of compounds in tea leaves.Long-term tea consumption is also associated with more efficient global brain network connectivity.This is the first publication that reviews the intersection of tea and cognitive health in aging. [Zhang Kaifan (2026); evidence level 4]
Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording.
This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.
Sources