I've been working with DMSO for many years. I buy the 99% strength and keep empty bottles to dilute the DMSO with clean water. Small amounts at a time. Or one can buy DMSO already diluted. One can also buy roll on products. I don't fear it as there are reports on this fear. I also use MSM in higher doses in 8 oz water a couple times daily to help calm pain of OA and I think Fibro. Lucky Vitamin and Vitacost and Amazon and Ebay have good supplies of DMSO.