I have used it for joint pain, not diabetic nerve pain. It works, but a 20% Ketoprofen cream works much better. However, DMSO is cheap and the cream is expensive.
DMSO is also greasy and smells bad. Several applications per day required. The cream is greasy too, but it really works, and requires only one application a day for me.
For the cream, I just my doctor what I wanted and why and he wrote a prescription. It has to be compounded.