Metabolism support. Chromium functions as a cofactor for insulin and thus plays a role in sugar carbohydrate protein and fat metabolism. Chromium works with your body s use of sugar and also plays a role in the metabolism of proteins and fats. Use as a part of your diet to help maintain healthy blood sugar levels already within a normal range. Metabolism support. Chromium functions as a cofactor for insulin and thus plays a role in sugar carbohydrate protein and fat metabolism. Chromium works with your body s use of sugar and also plays a role in the metabolism of proteins and fats. Use as a part of your diet to help maintain healthy blood sugar levels already within a normal range.