I have read a lot about Deca being good on the joints and I have also read that it is not true. I have an arthritic disease called Anklosingspondylitis. Came on when I was in my early twenties, now mid thirties. A lot of time when I work out especially back or legs, my arthritis will flare up and nervers will hurt, sometimes my Cyatic (I think thats how you spell it). Since I started the Deca Mid november, I have not had any pain and I have working out intensly. Not sure if that is a direct result, just thought I would share some of my experience...