In addition to cultivars used for the production of olive oil, (Picholine, Olivière, Lucques) analysed in this study, three unidentified cultivars, mainly used as decorative trees, of probably Greek (Bleu Grec) and Spanish (UKN 4) origin were also analysed. was stable for at least six months when leaf powder was stored at any temperature with a relative humidity of 57% . However, it should be pointed out that the 2021 leaf samples in this study were not stored under controlled conditions. Nonetheless, the promising results obtained here for the widelyplanted Olivière cultivar paves the way forward for the exploration of this variety as a valuable and abundant source of naturally-sourced oleuropein.