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While there are no official federal guidelines, common practices include: 100–200 mg per day.

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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 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. While there are no official federal guidelines, common

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Research in these populations is currently limited. L-Theanine: Dosage, Benefits, and Side Effects - Healthline

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