I've been using this just over a week and if you like muscle rub/tiger balm etc take a punt, this stuff is much stronger and longer lasting. There is some science behind it too but in laymans terms it's supposedly strong enough to trigger an inflammatory response from the body healing small injuries or reliving pain a lot quicker. Theres obv more products out there but this is the strongest I have found on ebay so far. https://m.ebay.co.uk/itm/NECK-PAIN-...0b:m:mQF8eXDDPBv5gqsnt91XyWA&var=562528566239 I have the 16m scoville stuff at present and it's awesome but apparently will not come out of your elbow/knee sleeves - currently have elbow sleeve on with no fresh product applied today and it's still pretty hot. It is a small bottle with a roll on applicator so no need to touch it. It will redden your skin significantly at first. Do not get in eyes/mouth/nose etc!