Regarding "Industrial" DMSO vs "Medical grade." Several years ago I was interested in DMSO and did quite a bit of research on this stuff. It is truly a wonder product, but I was concerned about the 'purity' thing. So I contacted the company that makes DMSO and asked them about it. This is what they told me. Dmso is Dmso, period. There is no 'medical grade' or 'industrial' grade. It is all the same. DMSO is Dimethyl sulfoxide period. The only difference is how much distilled water is mixed with it. If it is 70% DMSO that just means it has been mixed with 30% distilled water. If it is 99% pure, it means it was mixed with 1% distilled water. If it says 99.9% pure, it has no measurable distilled water mixed with it. PERIOD> So when you read on the internet that 'their' product is "more pure" than anyone elses, you're being "taken". I've seen ads stating that "Our product is only 'Medical grade'" to justify charging as much as 38.00 per bottle!! ? This is ridiculous! I buy my bottle of DMSO at our FEED and SEED store for 7.50!! It is 99% pure and I have been using for years! So don't be taken to the cleaners over this stuff. Do your own research.!!!