The invention relates to an oral formulation of methylglyoxal and/or its imino acid conjugates for human use and methods for preparing the compositions. Particularly, the invention relates to compositions comprising methylglyoxal and more particularly, imino acid conjugates of methylglyoxal. The present invention also relates to formulations of methylglyoxal and imino acid conjugates of methylglyoxal that can be used for the treatment and suppression of malignant diseases including but not limited to the cancers of Colon, Prostate, Pancreas, Lung, Oral cavity, Glioblastoma, and Leukemia.