Diet Fuel is a diet support formula containing caffeine in the form of guarana seed extract and green tea extract with other nutrients which may help facilitate fat loss including citrus aurantium fruit extract, St. John's wort, phenylalanine, quercitin and a citrus bioflavonoid complex.Healthy weight management and substantial weight loss are best achieved by making lifestyle changes, such as reducing caloric intake and increasing exercise activity. Use this product with a sensible diet and exercise program. Consult a health care professional before beginning any weight loss program. Read and follow all label instructions before using. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.