Natural products have provided important therapeutic use in several areas of medicine. The Leaves of Lagerstroemia speciosa were reported to possess good Anti-Diabetic activity. This study deals with Detection of metals present in the Lagerstroemia speciosa, by using ICP-OES (Inductively coupled plasma atomic emission spectroscopy) and Flame photometry instrument. The essential metals like sodium, potassium, Iron, Magnesium and Zinc were found to be predominant, while the heavy metals like cadmium, mercury and lead were found to be below the detectable limit. It has been clinically proved that the essential metals eg. Magnesium and zinc were used in the treatment of type II diabetes. The present study supports the anti-diabetic activity of this species.