Theasinesis (Tea) consist many components are useful and some are harmful to human health. Green tea is useful than other brands of tea in the market according to the Isolation of caffeine from different brand of tea and comparative analysis with Green tea by using U.V spectrophotometer and TLC procedure for the estimates the content of caffeine in various brands of tea and it is compared with green tea. This comparative study gives the differences between the various brands of tea and green tea. Also gives the various amount of caffeine in various brands of tea. This study gives that the green tea is healthy for human than other brands.