Yes.
To begin with, anyway.
One vid I saw showed a guy using 70%, but, I think he’d worked up to that (no problems with the 30-40 dilution). He had arthritis in his knuckles.
There’s an old (1970s) 60 minutes vid (they try to bury it, now) with a famous football player (QB, I think) showing Mike Wallace how he uses it on his shoulders, before games. No idea what %, if any, dilution it was :)
Thanks for your prompt reply. OA in finger joints is my primary target for using DMSO (secondarily, neck pain unless it’s not recommended). I’ve got some 99.9% which I will dilute with distilled water, just looking for the right percentage.