Polyphenols are active constituents of many well known herbs and plants, some of them use in traditional herbal remedies, known to interact on different ways against carcinogenesis, tumor cell proliferation, apoptosis, metastasis and inflammation. They also exert powerful antioxidant properties. In olives polyphenols contribute to give a bitter taste to olives and act also as astringents.
Polyphenols play also a very important role on disease prevention and treatment . Green tea is rich in polyphenols and it has been demonstrated that this characteristic may be the reason why green tea exhibits significant antioxidant, chemopreventive, and immunomodulatory effects in protecting the skin .