From Key Supplements
Jarrow Theanine 200 Review: Simple Single-Ingredient Option
August 10, 2026
Best for: A buyer who wants a simple, single-ingredient 200 mg L-theanine capsule.
Jarrow Theanine 200 supplies 200 mg L-theanine in a vegetarian capsule, without the added inositol found in some alternatives. The label is straightforward and the product is vegan, non-GMO, and gluten-free. The trade-off is that we did not find a product-specific independent certification claim on the product page.
What stands out
• 200 mg L-theanine per capsule.
• Single active ingredient.
• 60 capsules recently listed at $28.99, about $0.48 per serving before tax or offers.
What to consider
A simple formula is easier to compare, but that alone does not prove it will address sleep or stress concerns. Consult a clinician before use if you are pregnant, nursing, taking medication, or managing a medical condition.
Verdict
A clear, single-ingredient alternative to the NOW formula for someone who does not want added inositol. See the full guide and comparison: https://keysupplements.com/best-l-theanine-supplements-what-to-look-for/.
Affiliate disclosure: We may earn a commission from qualifying purchases, which never changes our assessment. Educational content only; not medical advice.