Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Greatest muscular pain reliever

This is a fantastic product for some people. For me, it is a miracle, gets rid of pain in minutes. However, my 95 year old mother tells me that it did not help her. I recommend it to everyone with pain in their legs or arms and most people tell me it works.I have no idea why it works for some people and no others.