Nutricost L-Theanine 200mg, 240 Capsules - Double Strength

Our verdict

Nutricost L-Theanine 200mg, 240 Capsules - Double Strength works out to $0.07 per serving of l-theanine, at 200mg per serving in capsule form. That puts it the cheapest quarter of the 30 l-theanine products we can price per dose, where the typical serving costs $0.17, a Value Index of 2.2 where the median product is 1.0. One container lasts 240 days at the label dose of 1 serving a day, about $2.24 a month. We could not verify a third-party certification for Nutricost in a public registry. Worked out from the current retail price as of 2026-11-13; confirm the live price on Amazon.com before buying.