I find if I get a massage where I inject my insulin it does seem to give it a boost. Sometimes my husband will massage my love handles or hip where I put the insulin right after I inject and it seems to have a little more strength but I wouldn't think a back massage would do anything. I think he's just working the insulin in more and I don't think it would have any effect hours after I take it. He gives me a foot and leg massage ,any nights and it does nothing to my bs