...I figured I would give it a try. I received the sample but never used it.I had almost forgot about it until today. This morning I woke up with severe back [pain] on my left side. I had a lot of work to do today that involved heavy machinery so I didn't want to used my normal back pills that make me drowsy. I decided to try the free sample, without having much faith that it would help, but what did I have to loose? Within maybe 30 minutes, the muscles had loosened up and my back was no longer hurting. Thanks!