Hi Dr. J, I love the SmartShip program. It’s easy to use and very convenient. I don’t have to remember to place another order when supplies get low because the SmartShip program automatically sends them. I signed up for the program after trying out the first bottle ordered. I saw significant improvement in my dogs and knew this was a product I would continue to use. And the 20% off was an added plus for me! Thanks so much for offering such great products!