:: Nutritional Benefits Of Tea Tea composition varies with climate, season, horticultural practices and variety. Polyphenols are the most important component in tea, as they constitute approximately 36 percent of the dry weight of tea. Other components of fresh green leaf include caffeine, protein and amino acids, carbohydrates, vitamins and minerals. Black tea is all-natural (non flavored) and contains no additives. It is virtually calorie-free (1 calorie per 100 ml) and sodium free. Tea includes fluoride, traces of vitamins A, K, C, and B vitamins. Average daily consumption of 3 cup of tea, provides very few calories and only a small amount of fat, whilst contributing valuable minerals and vitamins to the diet. It provides: Nearly 16% of the daily requirement of calcium. Almost 10% of the daily requirement of zinc. Over 10% of the folic acid need. Around 9%, 25% and 6% of vitamins B1, B2 and B6 respectively.