Fermented tea broth (known as Kombucha) has been used for ages in many countries, especially in Japan, Russia, China and Eastern Europe. Nowadays, this beverage is generally regarded a universal natural medicament having a strengthening effect on the human body. Kombucha beverage is popular because of its favourable effect on human health. Its composition includes: B vitamins, C vitamin, mineral components and organic acids. It is believed that Kombucha decreases the risk of cancer, prevents circulation disorders, improves the function of the digestive system, mitigates inflammatory conditions and has a favourable effect on the skin, hair and nails. The composition and properties of tea are well documented. Regrettably, the scientific information on the composition, effect on human body and properties of Kombucha is sparse. The goal of this paper is to present the properties and composition of Kombucha beverage as well as its biological activity and potential favourable effect on the human body.