“…In our work, propolis mitigated 6-OHDA-induced loss of TH-positive nigrostriatal dopaminergic neurons. Yet, despite the many variables that can hinder the comparison between different studies in animals evaluated by independent groups (type of model, methodological approaches, propolis composition, supplementation period, and concentration and dosage, among others), evidence has suggested propolis and its main flavonoids as neuroprotective agents, preserving brain tissues against many forms of neurotoxicity [ 67 , 68 , 69 , 70 , 71 , 72 , 73 ]. Barros Silva and collaborators [ 74 ] described a decrease in dopaminergic loss triggered by unilateral injection of 6-OHDA in the SNc and striatum of rats after administration of caffeic acid, a flavonoid present in Brazilian green propolis.…”