If you aren't aware L-theanine is associated with relaxation and mental alertness, as … Learn the good & bad for 250,000+ products. There are 35 bottles included with 16.9-ounces per bottle. Love that it is a Sencha/ Matcha blend since Sencha contains high amounts of Catechin antioxidants and Matcha offers more Caffeine and L-theanine than any other type of green tea. Costco Item #979855. Personalized health review for Kirkland Signature Green Tea - Matcha Blend: 0 calories, nutrition grade (A), problematic ingredients, and more. Ingredients: Kirkland signature diet green tea with citrus tastes sweet and refreshing. 100% Japanese tea leaves. Kirkland Signature Japanese Green Tea Product Details. Kirkland Signature – your satisfaction guaranteed. Costco has this item selling at $7.99. 100 count. Yes, It has about 11mg per 8 oz. Green tea contains caffeine. The package is 100% recyclable. While it doesn't usually contain as much as black tea (and far less than coffee), naturally produced green tea does have caffeine. Free of calories and low in sodium, this is a healthy great taste drink. As an added bonus, there is natural caffeine content in Japanese green tea so coffee drinkers, you are not missing out.