Rosmarinic acid is a caffeic acid ester , a naturally occurring polyphenolic compound . Polyphenols are a chemical group known to interact on different ways against carcinogenesis, tumor cell proliferation, apoptosis, metastasis and inflammation, but they also exert powerful antioxidant properties. Some other properties exerted by Rosmarinic acid include its anti-carcinogenic, antiviral, antibacterial and anti-inflammatory qualities [3,6].
In olives polyphenols contribute to give a bitter taste to olives and act also as astringents. Rosmarinic acid is also present in many of the herbs commonly used in the Mediterranean diet as Rosemary, sage, basil, oregano and Melissa officinalis among many others, probably one of the reasons of the health benefits of the Mediterranean diet and the lower risk of chronic diseases and cancer incidence rates  reported in most Mediterranean countries.
Common name: Rosemary