"The control solution was 100 ml of cool potable water and the L-theanine solution was prepared by dissolving 0.5 mg powdered L-theanine (Taiyo Kaguka Co. Ltd.,

"The control solution was 100 ml of cool potable water and the L-theanine solution was prepared by dissolving 0.5 mg powdered L-theanine (Taiyo Kaguka Co. Ltd., Yokkaichi, Japan) per Kg participant body weight in a tea infusion (total L-theanine 50mg/serving). " Why wouldn't the L-theanine solution be L-theanine in water? Including tea would introduce other chemicals, including caffeine, no? Also: "AUTHOR DISCLOSURES Gail Owen is an employee of Unilever, which markets food products some of which contain L-theanine and caffeine."