The global yield of extraction is not improved by the pretreatment when using ethanol as solvent in conventional extraction (CSE), although there is a clear increase in the extraction of the target compounds, rosmarinic and carnosic acid, when the leaves are de-oiled by Solvent Free Microwave Extraction, in agreement with Navarrete et al. (2011). Also, the milling process increases the yield of these compounds, although to a lower degree.