Never worked for me .At 31 ..now 55. Had to stop lifting weights ,which I loved to do. I think it works for muscle injuries ,tendons. Not Disc problems .I have 5 discs in my back that the fluid left and 2 bone spurs in my neck. Been working everyday with pain,and chiro never gave any relief. 2nd tore acl left knee with art and mcl tore in rt knee.Doing auto -collision work. Chiro is for minor pain in my book.Muscle strains and such,which heal sooner or later.