L-Theanine
Scored by the Formulate Research Team · Last reviewed July 2026
Score Breakdown
Three factors carry this score; three more are checked separately and can only take points away. Hover or tap to see what drove each one.
Ingredients per Serving
| Ingredient | Amount |
|---|---|
| L-Theanine5 systematic reviews · 18 randomised trials | 100 mg |
| decaffeinated Green Tea | 250 mg |
Certifications & Testing
Other Ingredients
Hypromellose, Rice Flour, Stearic Acid, Silicon Dioxide
Recommended Use
Suggested Usage: Take 1 capsule 1 to 2 times daily as needed, with food. Caution: Take with food.
Warnings
Do not take this product on an empty stomach; do not exceed recommended dose. Caution: Take with food. For adults only. Consult physician if pregnant/nursing, taking medication, or have a medical condition (including liver disease). Keep out of reach of children. Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes
Frequently Asked Questions
What is NOW Foods L-Theanine's Formulate score?
NOW Foods L-Theanine scores 91 out of 100 (grade A) on Formulate's ingredient-level rubric: clinical evidence, dose accuracy and bioavailability carry the score, while manufacturing, transparency and safety are checked separately and can only deduct.
Is NOW Foods L-Theanine worth it?
NOW Foods L-Theanine scores 91/100 (grade A). That puts it in Formulate's top tier: its ingredient doses, forms, and label transparency hold up against the clinical evidence, and it carries credible third-party testing. Formulate grades every product with the same automated rubric, so the score reflects the formula — not marketing or sponsorships.
What's in NOW Foods L-Theanine?
Each serving contains L-Theanine (100 mg), decaffeinated Green Tea (250 mg). Serving size: 1 Veg Capsule(s). 90 servings per container.
How do I take l-theanine?
Suggested Usage: Take 1 capsule 1 to 2 times daily as needed, with food. Caution: Take with food.
Who makes L-Theanine?
L-Theanine is made by NOW Foods. See Formulate's full grade and product lineup for NOW Foods on its brand page.
Is NOW Foods L-Theanine third-party tested?
NOW Foods lists the following certifications and testing for this product: Vegan, Vegetarian, Gluten-Free, Dairy-Free.
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Disclosure. Formulate may earn a commission from purchases made through links on this page. Commissions never influence scores — every product is graded by the same automated rubric. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.