At present, many publicity materials suggest that chromium is very beneficial to diabetes, on the one hand, chromium can participate in the recovery of pancreatic islet function of diabetic patients, promote the secretion of insulin and improve blood sugar level, in addition, chromium can also improve the microvascular and macrovascular lesions of diabetes. However, it is still controversial whether chromium has these effects on diabetes, and some clinical studies have found that chromium does not have so many positive effects as mentioned above, and that diabetic patients who eat nutritional products containing chromium do not have much effect on blood sugar control, so diabetic patients need to choose carefully.