If you have not tried Biofreeze for muscle aches, back aches, and/or arthritis, you need to try this! I have severe arthritis in my knee. I just had a cortisone shot in my knee to try to reduce the pain. It is not helping. I bought some Biofreeze over the counter in the roll on. At bedtime when my knee is throbbing, I roll on the Biofreeze, and it eases the pain. It penetrates your skin with a cold sensation. It is hard to describe, but it is amazing. I had my son apply it to my sore back muscles last night. I slept so good. This used to only be only available through a doctor. Over the counter is great!