The first Cretan high polyphenolic olive oil selected for a clinical study on the effect of olive oil on primary and secondary progressive multiple sclerosis (PPMS & SPMS) in 30 patients. Participants did not receive specific medication because their previous treatments had failed. After treatment with ELIAMA GOLD, there was a statistically significant improvement in mental functions such as visual-spatial abilities, visual memory, and the smoothness of executive processes. clinical study carried out by the Aristotle University of Thessaloniki and the University of Cyprus