Thanks to its mechanism of defence, CIGE-19® is a natural and potent immunostimulant. CIGE-19®, as a Mediterranean plant, is challenged by multiple stressors, particularly during the summer, when water deficiency co- occurs with high solar irradiance and high temperatures. These environmental constraints induce severe photo-oxidative stress3, resulting in the formation of many reactive oxygen species (ROS). Within the plant cell, a first line of defence against reactive oxygen species is constituted by antioxidant enzymes.