Chromium is a mineral that enhances insulin, a hormone that's important for turning food into energy. Your body also needs it to store carbohydrates, fats, and proteins. So there are claims that chromium supplements can lower your appetite, help you burn more calories, cut your body fat, and boost your muscle mass.
But a review of 24 studies that checked the effects of 200-1,000 micrograms of chromium a day found that there aren't any significant benefits.