What is the best chromium dosage for diabetes?

The short answer

A Canadian Family Physician review singled out chromium as having "level 1" evidence among complementary interventions for type 2 diabetes, improving HbA1c and fasting glucose in the trials reviewed. Those studies generally used 200-1000mcg per day, in the chromium picolinate form most often tested. Food sources like broccoli, whole grains, and nuts contain chromium but fall well below trial doses, so a supplement is the practical route if this is being considered. Because chromium can lower blood sugar meaningfully, anyone on insulin or other glucose-lowering medication should monitor closely and loop in a prescriber first.