We got our samples today. I was waiting for my wife to wake from her nap so she could try it and there went one of my trick knees. Being a former Army SOF soldier and Law Enforcement combined with youthful athletics has had a toll on my knees, just like a professional athlete; but I don't think about them until they hurt. But when they do hurt, it is nasty! When my wife got up she said "use some of that RTPR stuff yourself and see if it works." I applied it and was much better [quickly]...My wife also applied some for her...and it fixed her right up.