INS and type 2 diabetes mellitus: At the end of a 18-week study, recruited T2DM patients who were treated by Chinese propolis (900 mg/day) serum GSH, flavonoids, and polyphenols significantly increased, and serum lactate dehydrogenase activity was significantly reduced, however, no significant difference was found between the groups in serum glucose, glycosylated hemoglobin, insulin (16).