DMSO traditionally used as a topical - it is readily absorbed into the skin, and will take anything it comes in contact deeply into the tissues also.
http://en.wikipedia.org/wiki/Dimethyl_sulfoxide
I think it is used both orally and topically with MMS. I don't have the protocol handy, but here is a series of 13 Q&As about the use of MMS with DMSO
http://mmsadvisor.com/?cat=196
and here's a topic about it in the 76 page thread at CureZone
http://www.curezone.com/forums/am.asp?i=1152753
In the US, we'd find it in a healthfood store. I don't know about Canada.
alys