If you have a pulled muscle in your back, shoulders, neck or legs then, this is for you! I wish I had grabbed this before going to the emergency room! Even though I was prescribed a muscle relaxer and 800 mg of ibuprofen I was still hurting! So we went and picked this up along with a heating pad! I recommend a thin layer as they instruct you to do on the box! The more you apply at one time the more it burns. If you roll on a thin layer it's not too bad. You can feel the heat doing it's job. Also if you apply this DO NOT USE A HEATING PAD for at least two hours after applying or you will be greatly burned! I highly recommend that you go buy this if you pull or strain a muscle before wasting money on a trip to your local emergency room! So worth the money and can be found at your local pharmacy, Wal-Mart or Target stores!