DMSO is used for a variety of other things besides fina. It is a popular choice to add dmso to a transdermal PH to increase the absorbtion rate. The reason it is not found in any pre-made PH transdermals is becsue it is illegal for companies to add it to there products, this is why many people buy (or create there own) a transdermal and then add Dmso to it. If you are looking for more info on this, head over to anabolicminds.com, they are a great source of info for dmso and all transdermals.
PS: it works great for acing joints and pulls, if you use a solution of 10% dmso or less, you will not experience side effects such as body order or bad breath. MSM, as most of us know is a great topical pain releaver, is a direct cousin to DMSO.