Dead Sea Salts vs MgCl

This article here (http://pdc.csusb.edu/Environmental_Health/Proksch_2005.pdf) mentions the additional effect of Calcium in the Bath formula.
My concern, and i ask for you to contribute, is that the isolated MgCl may be actually missing the other minerals for, and toward, the ultimate healing effect from the Dead Sea bath therapy. My confusion arises from the idea that maybe potassium and calcium and sodium are a lot less or not absorbable transdermally? Tweet