Following the finding of in vitro insulinominetic activities of new prepared Zn(II) complexes with amide ligands (2-picolinamide (pa-a) and 6-methyl-2-picolinmethylamide (6mpa-ma)) in isolated rat adipocytes treated with epinephrine in terms of inhibition of free fatty acid release, their blood glucose normalizing effects were observed on daily intraperitoneal injections for 14 d in a type 2 diabetes mellitus model animal, KK-Ay mice. The blood glucose levels of KK-Ay mice were maintained in a normal range during the administration of both complexes. After the administration of each complex for 14 d, the improvement of glucose metabolism was confirmed as judged by the glucose tolerance test.