A systematic review published in 2016, reviewed the evidence for green tea supplementation on anthropometric, blood pressure and other biochemical measures associated with cardiovascular disease risk. Seven studies met this criteria (out of over 120,000 articles reviewed). The results of this review and analysis showed a consistent and significant reduction in body mass index, blood pressure and plasma lipids, further confirming the role of green tea catechins in promoting cardiovascular health.
Lau, S.O.; Georgousopoulou, E.N.; Kellett, J.; Thomas, J.; McKune, A.; Mellor, D.; Roach, P.D.; Naumovski, N. The Effect of Dietary Supplementation of Green Tea Catechins on Cardiovascular Disease Risk Markers in Humans: A Systematic Review of Clinical Trials. Beverages 2016, 2, 16. https://doi.org/10.3390/beverages2020016