What is A8 Cashback? Our signature A8 Cashback system is simple and easy to understand, but best of all, it's rewarding. When you purchase supplements that are part of a Cashback promotion you are eligible for money back toward future purchases. To see what items are part of a Cashback promotion, simply go to our home page and select the category A8 Cashback Items. The red logo in front of the item indicates the value of Cashback money when the item is purchased.