The present invention relates to an anti-diabetic composition comprising: a. an extract derived from a combination of at least two plant materials selected from the group consisting of Momordica muricata, Tinospora cordifolia, Trigonella foenum graceum, Caesalpinia bonducella, and Curcuma longa b. shilajit and c. optionally, at least one pharmaceutically acceptable carrier. The present invention also relates to a process for preparing an anti-diabetic composition.