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192 A placebo-controlled crossover trial in 28 older adults found a test assessing speed of memory improved during six hours after a single 750 mg dose of powdered rosemary leaf, an amount thought to reflect feasible culinary intake, but worsened in the hours following a 6,000 mg dose

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In the future, more applications of L-theanine in foods should be explored, and its dosage and processing in products should be further studied

According to the European Commission, the term energy drink is a commercial term, not legally defined, and refers to products that contain various combinations of substances that are attributed with stimulating effects on the body [2]