Organic Matcha Green Tea Powder (3.5 oz (100g)) in resealable pouch L-Theanine protects brain cells and promotes cognitive function. L-Theanine reduces the elevation of stress hormones and oxidative damage to brain. Stress significantly reduces performance and memory and increases oxidative stress in brain and elevates levels of stress-response hormones. During the test, treating animals with L-theanine before the stress is applied, results were in reversal, in both cognitive and stress hormones, and oxidative damage. L-Theanine lowers stroke risk and the damaging effects if a stroke has occurred. L-Theanine provides two stroke-preventing mechanisms: 1) Improves nitric oxide production in endothelial cells and aids to signal to relax muscles and enhance blood distribution. 2) Inhibits TNF-a (tumor necrosis factor alpha) and reduces the risk of an artery-blocking clot that produces a stroke. L-Theanine protects the body from the damage after the abrupt loss of circulation during the stroke. Animal studies show that administration of L-Theanine up to 12 hours after a stroke protects brain cells and reduces the size of the damaged brain areas. L-Theanine prevents damage to brain cells induced by aluminum. Storage information: Scoop 1/2 to 1 tsp. powder with a bamboo scoop as shown in the picture, or a spoon into a tea bowl. Add 6 to 8 oz warm water. Whisk up using &#034;zig zag motion&#034; with a traditional bamboo whisk until you have smooth, creamyfoam on the surface. Or, froth it up with a frother.