All Changes®, Twinlab® products are backed by a 100% guarantee of satisfaction or your money back. If any one of our products fails to fully meet your expectations, we will refund the entire price of purchase within 12 months of the date of purchase. That's how much we believe in the quality and effectiveness of our products. At Changes®, Twinlab® you can purchase online or by phone 24 hours a day, everyday, with confidence.