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L-theanine is an amino acid primarily found in tea leaves that promotes "wakeful relaxation" and calm focus. It is widely used to manage anxiety, improve sleep quality, and smooth out the jitters often caused by caffeine.

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Theanine has been shown to lower blood pressure in some clinical studies. L-Theanine: Dosage, Benefits, and Side Effects - Healthline L-theanine is an amino acid primarily found in

Because the FDA does not strictly regulate the efficacy of supplements before they hit the market, look for these specific indicators of quality: Theanine has been shown to lower blood pressure

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Avoid products with long lists of artificial colors, preservatives, or unnecessary fillers. Top Product Recommendations Based on recent expert reviews and specific use cases: Best Overall / Just L-Theanine: Swanson Suntheanine