This study was performed to investigate the effects of cinnamon extract on of blood glucose as well as serum insulin and testosterone hormones. The experiment was carried out on twenty four male adult mice distributed into 4 groups of 6 mice each. Group one was kept as positive control, while mice of the other three groups were given orally an aqueous cinnamon extract at 0.5, 1 and 2mg/ml respectively, daily for three weeks. The results showed that oral administration of cinnamon extract at 2 mg/ml to diabetic male mice for three weeks decreased blood glucose level and increased serum insulin and testosterone levels. This study recommends that intake of cinnamon bark as a drink may be beneficial for diabetic patients who suffer from sexual impotency as their extracts induce antidiabetic activity and enhance male fertility in diabetic mice.