I would agree with #76749 about veterinary standard DMSO. What you have to realize is that DMSO has only been approved by the FDA as an organ preservative for people having transplant operations. If you notice people who offer pure DMSO do not say anything about the use of the product-they can't.
The only other recommendation that I can make to you is to try to purchase pure DMSO from companies that also offer other types of topical DMSO (similar to your aloe Vera and DMSO cream). If the manufacturer is offering a cream with DMSO and ultra pure DMSO I would assume that the ultra pure DMSO that they are selling is also used in their products for the public and has high quality.