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Both active arms differed from placebo, but combination versus theanine alone did not (p=0.74); no established synergy.\nexposure: 200 mg theanine; 200 mg theanine plus 50 mg arginine; placebo\nevidence_span: {\"source_cache\": \"artifacts/theanine-research/36596553.abstract.txt\", \"locator\": \"Primary indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"d932aa2f599868e52419cee62048a12b929d575cbb78c95645195083668ea245\", \"start_char\": 0, \"end_char\": 1550, \"text_sha256\": \"d932aa2f599868e52419cee62048a12b929d575cbb78c95645195083668ea245\"}\n[theanine-p36596553] Effect of Combined Ingestion of L-Theanine and L-Arginine for Short-Term Psychological Stress in Young Adults: A Randomized Placebo-Controlled Study. 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