플라시보 / 카페인 50mg / 카페인 50mg + 테아닌 100mg
https://www.tandfonline.com/doi/abs/10.1179/147683008X301513
https://www.gwern.net/docs/nootropic/caffeine/2008-owen.pdf
플라시보 / 카페인 40mg + 테아닌 97mg
https://www.tandfonline.com/doi/abs/10.1179/147683010X12611460764840
https://corpora.tika.apache.org/base/docs/bug_trackers/ocrmypdf/ocrmypdf-LINK-325-54.pdf
플라시보 / 카페인 150mg / 테아닌 250mg / 카페인+테아닌
https://www.sciencedirect.com/science/article/abs/pii/S0301051107001573
https://asset-pdf.scinapse.io/prod/2011154018/2011154018.pdf
증류수 / 카페인 160mg / 테아닌 200mg / 카페인+테아닌 / 홍차 1컵
https://doi.org/10.1080/1028415X.2016.1144845
https://sci-hub.se/http://dx.doi.org/10.1080/1028415X.2016.1144845
플라시보 / 카페인 50mg / 테아닌 100mg / 카페인+테아닌 (시너지 효과는 나타나지 않음)
https://www.sciencedirect.com/science/article/abs/pii/S0028390812000408
https://static1.squarespace.com/static/5cd3231cd7819e6ae55fedb4/t/5cfebcd2375cd60001a2c130/1560198355185/Assessing+the+effects+of+caffeine+and+theanine+on+the+maintenance+of+vigilance+during+a+sustained+attention+task.pdf
플라시보 / 카페인 50mg / 테아닌 100mg / 카페인 50mg + 테아닌 100mg
https://academic.oup.com/jn/article/138/8/1572S/4750819
플라시보 / 카페인 2.0mg/kg / 테아닌 2.5mg/kg / 카페인+테아닌, ADHD 아동
https://academic.oup.com/cdn/article/3/Supplement_1/nzz031.OR29-04-19/5518234
https://www.nature.com/articles/s41598-020-70037-7 (같은 그룹의 다른 논문)
리뷰
https://www.cureus.com/articles/72733-the-cognitive-enhancing-outcomes-of-caffeine-and-l-theanine-a-systematic-review