I used to work with DMSO and it’s a very good skin penetrator. It also used to penetrate our latex gloves with no problem (this was in the days before nitrile gloves). Spill a drop on your hand and you can taste it in your mouth in minutes. At the end of the day my friends used to complain of the garlic-like smell emanating from my skin.
Personally I wouldn’t use it on a daily basis.
I bought Propylene Glycol on Amazon.es for a big bottle. 21euros. It is used extensively in cosmetics in EU. Have had excellent results. I use 1 0z. to dissolve rapa before mixing with 300 grams Cetaphil cream.