You can buy pharma grade dmso and msm from Dr Jacops. Hes the Doc who researched and popularized these. http://www.jacoblab.com
Tho as Oxy mentions dmso is restricted by the FDA it doesnt mean that the term, grade pharma, cannot be implied. If the compounds are free of deleterious matter, the unregulated wording can be used, tho you will rarely find it. Usually you will find pure or some other wordage meaning , no metals ect.