Green tea, commonly used by diabetic patients is famous for its medicinal value. It is a composition of unfermented leaves which can be used as beverage and as medicine. Camellia sinensis is the alternate name given for this medicinal tea. Drinking green herbal tea is an effective way for controlling sugar metabolism. Studies made on diabetic patients prove that those who drink herbal tea had a controlled blood sugar level. It promotes insulin production, blocks glucose absorption and helps in managing blood sugar level. Controlling high blood pressure is another advantage of drinking herbal tea. Presence of antioxidants like polyphenols in green herbal tea takes control over high blood pressure which in turn helps regulating sugar level. Slight bitter taste of herbal tea is due to the presence of these polyphenols. Functioning of antioxidants prevent action of free radicals in body. These free radicals are responsible for cell damage and ageing functions. Regular drinking of herbal tea promotes normal functioning of body cells. Tea, composed with catechins and polysaccharides slows down the growth of blood glucose level. Major six compounds of catechins equipped in green tea include catechin, gallaogatechin, epicatechin, epigallogatechin, epicatechin gallate and apigallochatechin gallate. Out of these six catechin compounds, apigallochatechin gallate commonly known as EGCG is the abundantly present and most functioning one in green tea.