Don't know the answer to that. Are you distilling the oils from the plant?

Whatever the case, keep in mind that whatever is mixed with DMSO and rubbed on the skin will inevitably end-up in the bloodstream unfiltered.

Arnica oil does a good job of penetrating the skin to reach ligaments, etc. by itself. As Estee says, DMSO brings it into the blood streem which isn't necessary or possibly desireable.