Here's what I found on Epson-It.

Epsom-It Ingredients:
Water, Magnesium Sulfate (epsom salt), Cyclomethicone, Dimethiconol, PPG/PEG- 18/18 Dimethicone, Glycerin, Methyl Salicylate, Propylene Glycol, Diazolidinyl Urea, Methylparaben, Proplparaben, Capsicum.


What I don't like about this are the petro/synthetic chemicals in it. I go to great lengths to avoid them. We use a magnesium oil without the added stuff and it works well. It's more costly though. I've read recipes where you can make your own with epsom salts.