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Wikipedia: Theanine
Encyclopedia article on L-theanine chemistry, tea and supplement sources, regulatory status, and mixed human-trial evidence quality; tertiary orientation next to forum N=1 HRV logs, not a substitute for preregistered RCTs.
Scope
Covers L-theanine as a tea-derived amino acid (and supplement ingredient), pharmacokinetics, glutamate-receptor binding themes in vitro, and regulatory threads (e.g., EFSA health-claim assessments, FDA GRAS notes).
Evidence discipline
Wikipedia summarizes heterogeneous supplement trials and authority skepticism toward broad cognition/stress claims—wearable HRV deltas on l-theanine-supplementation remain self-experiment tier until linked PubMed RCTs are curated here.
Pairing
wikipedia-caffeine-overview— combined theanine + caffeine consumer products versus theanine-alone arms in some studies.meditation-practice/slow-breathing— different autonomic levers when readers conflate “relaxation supplements” with paced-breathing trials.
Outcomes
- Tertiary overview: regulatory and review-level skepticism on broad theanine health claims—numeric HRV outcomes require primary studies, not encyclopedia prose alone.