You need to make sure that whatever brand you buy its NOT pasteurised as most of the health giving properties are destroyed! Im from the U.K so I cannot give you a brand unless your here. In the U.K the best brand is Lewtress although its advisable to make your own for pennies and get the proper dosages with ease then. Bare in mind for adults you should be drinking 500ml a day of Kombucha, if you have cancer then its between 1 and 2 litres a day like Ronald Reagan did along with ozone.