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Opuntia dillenii, commonly known as the prickly pear cactus, has been traditionally used in various cultures for its medicinal properties. This study aimed to investigate the potential antidiabetic activity of Opuntia dillenii, focusing on its antioxidant properties. Using in vitro and in vivo models, the antioxidant capacity of Opuntia dillenii extracts was assessed, and its effect on glucose metabolism was evaluated. The results indicated that the extracts exhibited significant antioxidant activity, as evidenced by the scavenging of free radicals and the reduction of oxidative stress markers. Furthermore, in diabetic animal models, treatment with Opuntia dillenii extracts led to a notable decrease in blood glucose levels and improved insulin sensitivity. The findings suggest that the antioxidant components of Opuntia dillenii play a pivotal role in its antidiabetic effects. This study underscores the potential of Opuntia dillenii as a natural therapeutic agent for diabetes management and highlights the importance of antioxidants in modulating glucose metabolism.