Having too much sugar in the blood for long periods of time can cause serious health problems if it's not treated. Hyperglycemia can damage the vessels that supply blood to vital organs, which can increase the risk of heart disease and stroke, kidney disease, vision problems, and nerve problems.
Studies have shown that chromium supplements may be helpful for people with type 2 diabetes and insulin resistance (prediabetes). There's good evidence that chromium can lower glucose levels and improve insulin sensitivity.