When I went to their site, the literature makes me believe that you get sent a full bottle plus a ten day free sample. If you aren't satisfied by the free sample, then you return the unopened bottle for a refund. But, it isn't clear and is confusing.

They state on their order page: Flex-Force with Hyaluronic Acid. One bottle containing 60 Capsules with 10 day supply for free for only $29.99 plus shipping and handling. If not satisfied with the free samples return the unopened bottle for a full refund not including shipping. Usually shipped next business day.