DMSO does promote healing by reducing inflammation, but the poster is correct in encouraging caution. Make sure you are trully healed before pushing it too far. You can get DMSO at any pet/feed store, so it is more common in rural areas. I just by it locally, but I’m sure it is available on the web.
DMSO should be pharma grade and is extremely cheap ($5 for 16oz). If they ask what I want to use it for, I just say “my cat has arthritus”. They look at me funny and ring it up.