If you are not completely satisfied with Thermo Phen Phen you can return the unused portion for a refund. As long as you have not used more than half the bottle you will receive a full refund of your purchase price. If you have used more than half you can still return what is left and you will received a refund equivalent to what remains. We feel our refund policy is extremely fair since it allows you to use Thermo Phen Phen for at least ten days and still be eligible for a full refund. The only thing you have to lose is weight.