The article reviews the health benefits of green tea, particularly focusing on its catechins, such as (-)-epigallocatechin-3-gallate (EGCG). Green tea is reported to have beneficial effects on various ailments, including cancer, heart disease, and liver disease. The review highlights the underlying mechanisms of green tea catechins and their biological actions, supported by in vitro and animal studies. Human studies also demonstrate the use of green tea catechins in treating metabolic syndrome, such as obesity, type II diabetes, and cardiovascular risk factors. Long-term consumption of tea catechins is suggested to be beneficial against high-fat diet-induced obesity and type II diabetes and may reduce the risk of coronary disease. The review emphasizes the need for further research to monitor the pharmacological and clinical effects of green tea and to elucidate its mechanisms of action, adhering to international standards.The article reviews the health benefits of green tea, particularly focusing on its catechins, such as (-)-epigallocatechin-3-gallate (EGCG). Green tea is reported to have beneficial effects on various ailments, including cancer, heart disease, and liver disease. The review highlights the underlying mechanisms of green tea catechins and their biological actions, supported by in vitro and animal studies. Human studies also demonstrate the use of green tea catechins in treating metabolic syndrome, such as obesity, type II diabetes, and cardiovascular risk factors. Long-term consumption of tea catechins is suggested to be beneficial against high-fat diet-induced obesity and type II diabetes and may reduce the risk of coronary disease. The review emphasizes the need for further research to monitor the pharmacological and clinical effects of green tea and to elucidate its mechanisms of action, adhering to international standards.