The invention relates to the field of pharmacology. More specifically, the invention relates to a composition for the treatment of diabetes mellitus and/or the metabolic syndrome. Even more specifically, the invention relates to a herbal composition for treating the same. In one of its embodiments, the invention provides a composition comprising a) an anti hyperglycaemic agent b) an anti inflammatory agent c) an anti hyperlipidemic agent d) an anti oxidant agent e) a gastro-intestinal agent, wherein said activities are provided by parts or extracts of Curcuma longa, Gymnema sylvestre, Momordica charantia, Emblica officinalis, Trigonelly foenum graecum and at least one species of Terminalia.