Method for preparing an olea europaea extract and method of use of the same

This invention describes a procedure for obtaining stabilised vegetable extracts from by extraction from the leaves dried at less than 35° C., purification of the extract and evaporation of the extract. The extract obtained contains a high Oleuropein content and a high raw material yield. Procedure for obtaining extracts from leaves dried at less than 35° C. with alkanols at a low temperature and extract purificationNew pharmacological applications of extracts as an agent reinforcing cellular immunity and delayed hypersensitivity in healthy humans, activating and proliferating T-lymphocytes, Natural Killer cells, monocytes and granulocytes, and pro-inflammatory cytokins.