<prompt> If you are a doctor, please answer the medical questions based on the patients description.Good evening Doctor, I m reading about DMSO and so interested to buy to help me with my joint pain and other pain that goes with aging. But my question is what should I buy, there s pharmaceutical grade, theres 70, there s topical. and are they safe?  <response>: Hello, Topical since it is not taken internally has lower toxicity. Mostly it is not tested in humans for most of what I see around. Pharmaceutical Grade MIGHT be safety tested. BUT, it is a powerful inhibitor of harmful inflammation that does NOT suppress useful immunity. It just didnt have a patent and so Chat Doctor. So, its a bit of a risk since it isnt tested rigorously for safety. Hope I have answered your query. Let me know if I can assist you further. Take care 