Double Strength 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 | 200 mg |
| Inositol77 systematic reviews · 126 randomised trials | 100 mg |
Certifications & Testing
Other Ingredients
Hypromellose, Stearic Acid, Silicon Dioxide
Recommended Use
Suggested Usage: Take 1 capsule 1 to 2 times daily as needed, preferably on an empty stomach.
Warnings
Caution: For adults only. Keep out of reach of children. Consult physician if pregnant/nursing, taking medication, or have a medical condition. Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Frequently Asked Questions
What is NOW Foods Double Strength L-Theanine's Formulate score?
NOW Foods Double Strength L-Theanine scores 89 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 Double Strength L-Theanine worth it?
NOW Foods Double Strength L-Theanine scores 89/100 (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 Double Strength L-Theanine?
Each serving contains L-Theanine (200 mg), Inositol (100 mg). Serving size: 1 Veg Capsule(s). 120 servings per container.
How do I take double strength l-theanine?
Suggested Usage: Take 1 capsule 1 to 2 times daily as needed, preferably on an empty stomach.
Who makes Double Strength L-Theanine?
Double Strength 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 Double Strength L-Theanine third-party tested?
NOW Foods lists the following certifications and testing for this product: Vegan, Vegetarian, Gluten-Free, Dairy-Free.
Related Supplements
Track double strength l-theanine in your stack
Build a personalized supplement stack free in your browser — no install. Flag dose overlaps and interactions, and keep every product scored against the latest evidence.
Is Double Strength L-Theanine right for your goals?
Two questions, then every ingredient graded against what you're actually trying to do — plus what it costs per effective dose.
Build my stack2 questions · free · no account needed to start
Also on iPhone — get the free app
Evidence-based supplement guides, no spam
We send a short digest when new guides drop — nothing else. No affiliate pushes, no sponsored content, unsubscribe anytime.
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.