What are the limitations (molecular shapes, sizes and/or masses) for DMSO to ferry substances through the skin. Does anyone know the correct concentration for penetrating the skin (I have heard 70-90%). Any help would be much appreciated.
does anyone even have any idea of what I am talking about.
does anyone even have any idea of what I am talking about.

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Yes DMSO can ferry just about anything through the skin barrier.
BUT BE VERY CAREFULL. It can also ferry bacteria and viruses. So make sure you have sterilized the area with alcohol swabs first. Also DMSO has a tendency to “blister” some people if applied above the waist. I can’t stress enough about the dangers of DMSO. So make sure you wash the area it’s to be applied to and use alcohol to sterilize. If precautions are taken DMSO can be very helpful. Your concentration percentages are correct pretty much anywhere in that area will work.