superior ingredients for the design of functional food, singular ingredients for cosmetics, etc. In this work the extraction of a mixture of spinach and rosemary leaves (50 wt.% of each plant) was investigated in terms of its antioxidant activity, and compared with the extraction of the separate species. Phenolic diterpenes of rosemary andcarotenoids of spinach were target compounds due their recognized biological activities. Two differentextraction techniques were applied, namely pressurized liquid extraction using hexane at two differenttemperatures (100 and 150◦C) and supercritical fluid extraction with pure carbon dioxide at 40◦C andtwo different pressures (20 and 30 MPa). For each extraction technique and conditions three differentraw materials were employed: spinach leaves, rosemary leaves and the mixture 50:50 of spinach and rosemary leaves