Aluminum (AI) has been implicated in the pathogenesis of several clinical disorders such as dialysis dementia and Alzheimer's diseases. This study investigates the effect of aluminum chloride on brain and liver function enzymes, contents of Fe, Cu, Zn and antioxidant enzymes activities in rats and the effect of riboflavin and vitamin A in alleviating such effects. Four equal groups of Sprague Dawleyy rats were used (n=10). Group 1: received AL (20 mg/ kg/ day) for 12 weeks. Group 2: received AI and vitamin A (30 IU/g). Group 3: received AI and riboflavin (15 mg/kg). Group 4: was control. Results showed that brain function enzymes were significantly decreased in AL-treated group. Al plus vitamin A or riboflavin alleviates this reduction. Concentration of Fe was significantly decreased in cerebral and hepatic homogenates in Al and Al plus vitamin A treated groups. Concentration of  Zn and Cu showed significant decrease in brain homogenates in AL treated group and non-significant decrease in AL plus vitamin A or riboflavin treated groups. The activities of antioxidant enzymes were significantly reduced in AL treated group. Al plus vitamin a or riboflavin improved these antioxidant activities. It is concluded that AL exposure induced significant changes in the hepatic and cerebral enzymatic activities, trace elements content and antioxidant activities. The incorporation of riboflavin or vitamin A improved hepatic and cerebral functions, suggesting their protective role in aluminum toxicity.